**Item category:** Aldehydes, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1989, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aldehydes, n.o.s. 3 UN1989 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aldehydes, n.o.s. — Postal shipping restrictions by item category


**Item category:** Aldol

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2839, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aldol 6.1 UN2839 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aldol — Postal shipping restrictions by item category


**Item category:** Aldrin, liquid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, NA2762, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aldrin, liquid 6.1 NA2762 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aldrin, liquid — Postal shipping restrictions by item category


**Item category:** Aldrin, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, NA2761, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aldrin, solid 6.1 NA2761 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aldrin, solid — Postal shipping restrictions by item category


**Item category:** Alkali metal alcoholates, self-heating, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.2, UN3206, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal alcoholates, self-heating, corrosive, n.o.s. 4.2 UN3206 II, III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal alcoholates, self-heating, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Alkali metal alloys, liquid, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN1421, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal alloys, liquid, n.o.s. 4.3 UN1421 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal alloys, liquid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Alkali metal amalgam, liquid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN1389, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal amalgam, liquid 4.3 UN1389 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal amalgam, liquid — Postal shipping restrictions by item category


**Item category:** Alkali metal amalgam, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN3401, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal amalgam, solid 4.3 UN3401 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal amalgam, solid — Postal shipping restrictions by item category


**Item category:** Alkali metal amides

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1390, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Alkali metal amides 4.3 UN1390 II Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal amides — Postal shipping restrictions by item category


**Item category:** Alkali metal dispersions, flammable or Alkaline earth metal dispersions, flammable

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN3482, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal dispersions, flammable or Alkaline earth metal dispersions, flammable 4.3 UN3482 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal dispersions, flammable or Alkaline earth metal dispersions, flammable — Postal shipping restrictions by item category


**Item category:** Alkali metal dispersions, or Alkaline earth metal dispersions

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN1391, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkali metal dispersions, or Alkaline earth metal dispersions 4.3 UN1391 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkali metal dispersions, or Alkaline earth metal dispersions — Postal shipping restrictions by item category


**Item category:** Alkaline earth metal alcoholates, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.2, UN3205, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkaline earth metal alcoholates, n.o.s. 4.2 UN3205 II, III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaline earth metal alcoholates, n.o.s. — Postal shipping restrictions by item category


**Item category:** Alkaline earth metal alloys, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1393, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Alkaline earth metal alloys, n.o.s. 4.3 UN1393 II Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaline earth metal alloys, n.o.s. — Postal shipping restrictions by item category


**Item category:** Alkaline earth metal amalgams, liquid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN1392, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkaline earth metal amalgams, liquid 4.3 UN1392 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaline earth metal amalgams, liquid — Postal shipping restrictions by item category


**Item category:** Alkaline earth metal amalgams, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN3402, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkaline earth metal amalgams, solid 4.3 UN3402 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaline earth metal amalgams, solid — Postal shipping restrictions by item category


**Item category:** Alkaloids, liquid, n.o.s., or Alkaloid salts, liquid, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN3140, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkaloids, liquid, n.o.s., or Alkaloid salts, liquid, n.o.s. 6.1 UN3140 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaloids, liquid, n.o.s., or Alkaloid salts, liquid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Alkaloids, solid, n.o.s. or Alkaloid salts, solid, n.o.s. poisonous

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1544, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkaloids, solid, n.o.s. or Alkaloid salts, solid, n.o.s. poisonous 6.1 UN1544 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkaloids, solid, n.o.s. or Alkaloid salts, solid, n.o.s. poisonous — Postal shipping restrictions by item category


**Item category:** Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with more than 5 percent free sulfuric acid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2584, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with more than 5 percent free sulfuric acid 8 UN2584 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with more than 5 percent free sulfuric acid — Postal shipping restrictions by item category


**Item category:** Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with not more than 5 percent free sulfuric acid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2586, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with not more than 5 percent free sulfuric acid 8 UN2586 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkyl sulfonic acids, liquid or Aryl sulfonic acids, liquid with not more than 5 percent free sulfuric acid — Postal shipping restrictions by item category


**Item category:** Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with more than 5 percent free sulfuric acid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2583, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with more than 5 percent free sulfuric acid 8 UN2583 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with more than 5 percent free sulfuric acid — Postal shipping restrictions by item category


**Item category:** Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with not more than 5 percent free sulfuric acid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2585, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with not more than 5 percent free sulfuric acid 8 UN2585 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkyl sulfonic acids, solid or Aryl sulfonic acids, solid with not more than 5 percent free sulfuric acid — Postal shipping restrictions by item category


**Item category:** Alkylphenols, liquid, n.o.s. (including C2-C12 homologues)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN3145, packing group II, III; domestic mail air: 8A; domestic mail surface: 8A

> Alkylphenols, liquid, n.o.s. (including C2-C12 homologues) 8 UN3145 II, III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkylphenols, liquid, n.o.s. (including C2-C12 homologues) — Postal shipping restrictions by item category


**Item category:** Alkylphenols, liquid, n.o.s. (including C2C12 homologues)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN3145, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkylphenols, liquid, n.o.s. (including C2C12 homologues) 8 UN3145 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkylphenols, liquid, n.o.s. (including C2C12 homologues) — Postal shipping restrictions by item category


**Item category:** Alkylphenols, solid, n.o.s. (including C2-C12 homologues)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2430, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Alkylphenols, solid, n.o.s. (including C2-C12 homologues) 8 UN2430 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkylphenols, solid, n.o.s. (including C2-C12 homologues) — Postal shipping restrictions by item category


**Item category:** Alkylsulfuric acids

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2571, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Alkylsulfuric acids 8 UN2571 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alkylsulfuric acids — Postal shipping restrictions by item category


**Item category:** All flammable liquids with flashpoint of 20 F (-7 C) or below

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** All flammable liquids with flashpoint at or below 20 F are prohibited from mailing

> All flammable liquids having a flashpoint of 20° F (-7° C) or below are prohibited from mailing.

Source: <https://pe.usps.com/text/pub52/pub52c3_022.htm>

All flammable liquids with flashpoint of 20 F (-7 C) or below — Postal shipping restrictions by item category


**Item category:** Allyl acetate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN2333, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl acetate 3 UN2333 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl acetate — Postal shipping restrictions by item category


**Item category:** Allyl alcohol

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1098, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl alcohol 6.1 UN1098 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl alcohol — Postal shipping restrictions by item category


**Item category:** Allyl bromide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1099, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl bromide 3 UN1099 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl bromide — Postal shipping restrictions by item category


**Item category:** Allyl chloride

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1100, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl chloride 3 UN1100 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl chloride — Postal shipping restrictions by item category


**Item category:** Allyl chloroformate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1722, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl chloroformate 6.1 UN1722 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl chloroformate — Postal shipping restrictions by item category


**Item category:** Allyl ethyl ether

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN2335, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl ethyl ether 3 UN2335 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl ethyl ether — Postal shipping restrictions by item category


**Item category:** Allyl formate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN2336, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl formate 3 UN2336 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl formate — Postal shipping restrictions by item category


**Item category:** Allyl glycidyl ether

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN2219, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Allyl glycidyl ether 3 UN2219 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl glycidyl ether — Postal shipping restrictions by item category


**Item category:** Allyl iodide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1723, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl iodide 3 UN1723 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl iodide — Postal shipping restrictions by item category


**Item category:** Allyl isothiocyanate, stabilized

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1545, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyl isothiocyanate, stabilized 6.1 UN1545 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyl isothiocyanate, stabilized — Postal shipping restrictions by item category


**Item category:** Allylamine

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2334, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allylamine 6.1 UN2334 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allylamine — Postal shipping restrictions by item category


**Item category:** Allyltrichlorosilane, stabilized

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1724, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Allyltrichlorosilane, stabilized 8 UN1724 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Allyltrichlorosilane, stabilized — Postal shipping restrictions by item category


**Item category:** alpha-Methylbenzyl alcohol, liquid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2937, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> alpha-Methylbenzyl alcohol, liquid 6.1 UN2937 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

alpha-Methylbenzyl alcohol, liquid — Postal shipping restrictions by item category


**Item category:** alpha-Methylbenzyl alcohol, solid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN3438, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> alpha-Methylbenzyl alcohol, solid 6.1 UN3438 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

alpha-Methylbenzyl alcohol, solid — Postal shipping restrictions by item category


**Item category:** alpha-Methylvaleraldehyde

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN2367, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> alpha-Methylvaleraldehyde 3 UN2367 II Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

alpha-Methylvaleraldehyde — Postal shipping restrictions by item category


**Item category:** Alpha-Naphthylamine

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2077, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Alpha-Naphthylamine 6.1 UN2077 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alpha-Naphthylamine — Postal shipping restrictions by item category


**Item category:** Alpha-Pinene

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN2368, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Alpha-Pinene 3 UN2368 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Alpha-Pinene — Postal shipping restrictions by item category


**Item category:** Aluminum borohydride or Aluminum borohydride in devices

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.2, UN2870, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aluminum borohydride or Aluminum borohydride in devices 4.2 UN2870 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum borohydride or Aluminum borohydride in devices — Postal shipping restrictions by item category


**Item category:** Aluminum bromide, anhydrous

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1725, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Aluminum bromide, anhydrous 8 UN1725 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum bromide, anhydrous — Postal shipping restrictions by item category


**Item category:** Aluminum bromide, solution

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2580, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Aluminum bromide, solution 8 UN2580 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum bromide, solution — Postal shipping restrictions by item category


**Item category:** Aluminum carbide

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1394, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum carbide 4.3 UN1394 II Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum carbide — Postal shipping restrictions by item category


**Item category:** Aluminum chloride, anhydrous

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1726, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Aluminum chloride, anhydrous 8 UN1726 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum chloride, anhydrous — Postal shipping restrictions by item category


**Item category:** Aluminum chloride, solution

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2581, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Aluminum chloride, solution 8 UN2581 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum chloride, solution — Postal shipping restrictions by item category


**Item category:** Aluminum dross, wet or hot

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Aluminum dross, wet or hot Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum dross, wet or hot — Postal shipping restrictions by item category


**Item category:** Aluminum ferrosilicon powder

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1395, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum ferrosilicon powder 4.3 UN1395 II, III Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum ferrosilicon powder — Postal shipping restrictions by item category


**Item category:** Aluminum hydride

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN2463, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aluminum hydride 4.3 UN2463 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum hydride — Postal shipping restrictions by item category


**Item category:** Aluminum, molten

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 9, NA9260, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aluminum, molten 9 NA9260 III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum, molten — Postal shipping restrictions by item category


**Item category:** Aluminum, nitrate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1438, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Aluminum, nitrate 5.1 UN1438 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum, nitrate — Postal shipping restrictions by item category


**Item category:** Aluminum phosphide pesticides

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN3048, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aluminum phosphide pesticides 6.1 UN3048 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum phosphide pesticides — Postal shipping restrictions by item category


**Item category:** Aluminum powder, coated

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.1, UN1309, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum powder, coated 4.1 UN1309 II, III Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum powder, coated — Postal shipping restrictions by item category


**Item category:** Aluminum powder, uncoated

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1396, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum powder, uncoated 4.3 UN1396 II, III Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum powder, uncoated — Postal shipping restrictions by item category


**Item category:** Aluminum resinate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.1, UN2715, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum resinate 4.1 UN2715 III Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum resinate — Postal shipping restrictions by item category


**Item category:** Aluminum silicon powder, uncoated

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1398, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Aluminum silicon powder, uncoated 4.3 UN1398 III Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum silicon powder, uncoated — Postal shipping restrictions by item category


**Item category:** Aluminum smelting by-products or Aluminum remelting by-products

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN3170, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aluminum smelting by-products or Aluminum remelting by-products 4.3 UN3170 II, III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aluminum smelting by-products or Aluminum remelting by-products — Postal shipping restrictions by item category


**Item category:** Amine, flammable, corrosive, n.o.s. or Polyamines, flammable, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN2733, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amine, flammable, corrosive, n.o.s. or Polyamines, flammable, corrosive, n.o.s. 3 UN2733 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amine, flammable, corrosive, n.o.s. or Polyamines, flammable, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Amine, liquid, corrosive, flammable, n.o.s. or Polyamines, liquid, corrosive, flammable, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2734, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amine, liquid, corrosive, flammable, n.o.s. or Polyamines, liquid, corrosive, flammable, n.o.s. 8 UN2734 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amine, liquid, corrosive, flammable, n.o.s. or Polyamines, liquid, corrosive, flammable, n.o.s. — Postal shipping restrictions by item category


**Item category:** Amines, liquid, corrosive, n.o.s. or Polyamines, liquid, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2735, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amines, liquid, corrosive, n.o.s. or Polyamines, liquid, corrosive, n.o.s. 8 UN2735 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amines, liquid, corrosive, n.o.s. or Polyamines, liquid, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Amines, solid, corrosive, n.o.s. or Polyamines, solid, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN3259, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amines, solid, corrosive, n.o.s. or Polyamines, solid, corrosive, n.o.s. 8 UN3259 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amines, solid, corrosive, n.o.s. or Polyamines, solid, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Aminophenols (o-; m-; p-)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2512, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Aminophenols (o-; m-; p-) 6.1 UN2512 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aminophenols (o-; m-; p-) — Postal shipping restrictions by item category


**Item category:** Ammonia, anhydrous (domestic)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.2, UN1005, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonia, anhydrous (domestic) 2.2 UN1005 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonia, anhydrous (domestic) — Postal shipping restrictions by item category


**Item category:** Ammonia, anhydrous (international)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.3, UN1005, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonia, anhydrous (international) 2.3 UN1005 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonia, anhydrous (international) — Postal shipping restrictions by item category


**Item category:** Ammonia solution, relative density between 0.880 and 0.957 at 15° C in water, with more than 10 percent but not more than 35 percent ammonia

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2672, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Ammonia solution, relative density between 0.880 and 0.957 at 15° C in water, with more than 10 percent but not more than 35 percent ammonia 8 UN2672 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonia solution, relative density between 0.880 and 0.957 at 15° C in water, with more than 10 percent but not more than 35 percent ammonia — Postal shipping restrictions by item category


**Item category:** Ammonia solution, relative density less than 0.880 at 15° C in water, with more than 50 percent ammonia

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.2, UN3318, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonia solution, relative density less than 0.880 at 15° C in water, with more than 50 percent ammonia 2.2 UN3318 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonia solution, relative density less than 0.880 at 15° C in water, with more than 50 percent ammonia — Postal shipping restrictions by item category


**Item category:** Ammonium arsenate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1546, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium arsenate 6.1 UN1546 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium arsenate — Postal shipping restrictions by item category


**Item category:** Ammonium azide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium azide Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium azide — Postal shipping restrictions by item category


**Item category:** Ammonium bromate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium bromate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium bromate — Postal shipping restrictions by item category


**Item category:** Ammonium chlorate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium chlorate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium chlorate — Postal shipping restrictions by item category


**Item category:** Ammonium dichromate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1439, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium dichromate 5.1 UN1439 II 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium dichromate — Postal shipping restrictions by item category


**Item category:** Ammonium dinitro-o-cresolate, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1843, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium dinitro-o-cresolate, solid 6.1 UN1843 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium dinitro-o-cresolate, solid — Postal shipping restrictions by item category


**Item category:** Ammonium dinitro-o-cresolate, solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN3424, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium dinitro-o-cresolate, solution 6.1 UN3424 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium dinitro-o-cresolate, solution — Postal shipping restrictions by item category


**Item category:** Ammonium fluoride

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2505, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Ammonium fluoride 6.1 UN2505 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium fluoride — Postal shipping restrictions by item category


**Item category:** Ammonium fluorosilicate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2854, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Ammonium fluorosilicate 6.1 UN2854 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium fluorosilicate — Postal shipping restrictions by item category


**Item category:** Ammonium fulminate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium fulminate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium fulminate — Postal shipping restrictions by item category


**Item category:** Ammonium hydrogen sulfate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2506, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Ammonium hydrogen sulfate 8 UN2506 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium hydrogen sulfate — Postal shipping restrictions by item category


**Item category:** Ammonium hydrogendiflouride, solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2817, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium hydrogendiflouride, solution 8 UN2817 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium hydrogendiflouride, solution — Postal shipping restrictions by item category


**Item category:** Ammonium hydrogendifluoride, solid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1727, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Ammonium hydrogendifluoride, solid 8 UN1727 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium hydrogendifluoride, solid — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate based fertilizers

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN2067, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium nitrate based fertilizers 5.1 UN2067 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate based fertilizers — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate fertilizers

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, NA2072, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium nitrate fertilizers 5.1 NA2072 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate fertilizers — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate-fuel oil mixture containing only prilled ammonium nitrate and fuel oil

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.5D, NA0331, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium nitrate-fuel oil mixture containing only prilled ammonium nitrate and fuel oil 1.5D NA0331 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate-fuel oil mixture containing only prilled ammonium nitrate and fuel oil — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate, liquid (hot concentrated solution)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN2426, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium nitrate, liquid (hot concentrated solution) 5.1 UN2426 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate, liquid (hot concentrated solution) — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate mixed fertilizers

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, NA2069, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium nitrate mixed fertilizers 5.1 NA2069 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate mixed fertilizers — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate, with more than 0.2 percent combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1D, UN0222, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium nitrate, with more than 0.2 percent combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance 1.1D UN0222 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate, with more than 0.2 percent combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate, with not more than 0.2 percent of combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1942, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium nitrate, with not more than 0.2 percent of combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance 5.1 UN1942 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate, with not more than 0.2 percent of combustible substances, including any organic substance calculated as carbon, to the exclusion of any other added substance — Postal shipping restrictions by item category


**Item category:** Ammonium nitrate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium nitrate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium nitrate — Postal shipping restrictions by item category


**Item category:** Ammonium perchlorate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1D, UN0402, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium perchlorate 1.1D UN0402 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium perchlorate — Postal shipping restrictions by item category


**Item category:** Ammonium permanganate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ammonium permanganate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium permanganate — Postal shipping restrictions by item category


**Item category:** Ammonium persulfate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1444, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ammonium persulfate 5.1 UN1444 III 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium persulfate — Postal shipping restrictions by item category


**Item category:** Ammonium picrate, dry or wetted with less than 10 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1D, UN0004, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium picrate, dry or wetted with less than 10 percent water, by mass 1.1D UN0004 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium picrate, dry or wetted with less than 10 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Ammonium picrate, wetted with not less than 10 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.1, UN1310, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium picrate, wetted with not less than 10 percent water, by mass 4.1 UN1310 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium picrate, wetted with not less than 10 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Ammonium polysulfide, solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2818, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium polysulfide, solution 8 UN2818 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium polysulfide, solution — Postal shipping restrictions by item category


**Item category:** Ammonium polyvanadate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2861, packing group II; domestic mail air: 6A; domestic mail surface: 6A

> Ammonium polyvanadate 6.1 UN2861 II 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium polyvanadate — Postal shipping restrictions by item category


**Item category:** Ammonium sulfide solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2683, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammonium sulfide solution 8 UN2683 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammonium sulfide solution — Postal shipping restrictions by item category


**Item category:** Ammunition, illuminating with or without burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2G, UN0171, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, illuminating with or without burster, expelling charge, or propelling charge 1.2G UN0171 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, illuminating with or without burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, incendiary liquid or gel, with burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.3J, UN0247, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, incendiary liquid or gel, with burster, expelling charge, or propelling charge 1.3J UN0247 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, incendiary liquid or gel, with burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, incendiary, white phosphorus, with burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.3H, UN0244, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, incendiary, white phosphorus, with burster, expelling charge, or propelling charge 1.3H UN0244 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, incendiary, white phosphorus, with burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, incendiary with or without burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2G, UN0009, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, incendiary with or without burster, expelling charge, or propelling charge 1.2G UN0009 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, incendiary with or without burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, practice

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.4G, UN0362, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, practice 1.4G UN0362 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, practice — Postal shipping restrictions by item category


**Item category:** Ammunition, proof

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.4G, UN0363, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, proof 1.4G UN0363 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, proof — Postal shipping restrictions by item category


**Item category:** Ammunition, smoke, white phosphorus with burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.3H, UN0246, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, smoke, white phosphorus with burster, expelling charge, or propelling charge 1.3H UN0246 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, smoke, white phosphorus with burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, smoke, with or without burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2G, UN0015, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, smoke, with or without burster, expelling charge, or propelling charge 1.2G UN0015 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, smoke, with or without burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, tear-producing with burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2G, UN0018, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, tear-producing with burster, expelling charge, or propelling charge 1.2G UN0018 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, tear-producing with burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition, toxic with burster, expelling charge, or propelling charge

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2K, UN0020, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ammunition, toxic with burster, expelling charge, or propelling charge 1.2K UN0020 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ammunition, toxic with burster, expelling charge, or propelling charge — Postal shipping restrictions by item category


**Item category:** Ammunition

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic

**Conditions:** Completely forbidden in the U.S. mail

> Items You can't send these items in the U.S. mail: Air Bags Ammunition Explosives Gasoline Liquid Mercury Marijuana (medical or otherwise); hemp/CBD is allowed, but restricted Domestically Restricted Items You can send the following items if you follow all the rules and restrictions. See a more complete list in <https://pe.usps.com/text/pub52/index.htm> USPS

Source: <https://www.usps.com/ship/shipping-restrictions.htm>

Ammunition — Postal shipping restrictions by item category


**Item category:** Amyl acetates

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN1104, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl acetates 3 UN1104 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl acetates — Postal shipping restrictions by item category


**Item category:** Amyl acid phosphate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2819, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Amyl acid phosphate 8 UN2819 III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl acid phosphate — Postal shipping restrictions by item category


**Item category:** Amyl butyrates

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN2620, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl butyrates 3 UN2620 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl butyrates — Postal shipping restrictions by item category


**Item category:** Amyl chlorides

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN1107, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl chlorides 3 UN1107 II Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl chlorides — Postal shipping restrictions by item category


**Item category:** Amyl formates

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN1109, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl formates 3 UN1109 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl formates — Postal shipping restrictions by item category


**Item category:** Amyl mercaptans

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1111, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amyl mercaptans 3 UN1111 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl mercaptans — Postal shipping restrictions by item category


**Item category:** Amyl nitrate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN1112, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl nitrate 3 UN1112 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl nitrate — Postal shipping restrictions by item category


**Item category:** Amyl nitrites

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN1113, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Amyl nitrites 3 UN1113 II Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyl nitrites — Postal shipping restrictions by item category


**Item category:** Amylamines

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN1106, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amylamines 3 UN1106 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amylamines — Postal shipping restrictions by item category


**Item category:** Amyltrichlorosilane

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1728, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Amyltrichlorosilane 8 UN1728 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Amyltrichlorosilane — Postal shipping restrictions by item category


**Item category:** Aniline hydrochloride

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1548, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Aniline hydrochloride 6.1 UN1548 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aniline hydrochloride — Postal shipping restrictions by item category


**Item category:** Aniline

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1547, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Aniline 6.1 UN1547 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aniline — Postal shipping restrictions by item category


**Item category:** Anisidines

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2431, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Anisidines 6.1 UN2431 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Anisidines — Postal shipping restrictions by item category


**Item category:** Anisole

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, UN2222, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Anisole 3 UN2222 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Anisole — Postal shipping restrictions by item category


**Item category:** Anisoyl chloride

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1729, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Anisoyl chloride 8 UN1729 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Anisoyl chloride — Postal shipping restrictions by item category


**Item category:** Antimony compounds, inorganic, liquid, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN3141, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Antimony compounds, inorganic, liquid, n.o.s. 6.1 UN3141 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony compounds, inorganic, liquid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Antimony compounds, inorganic, solid, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1549, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Antimony compounds, inorganic, solid, n.o.s. 6.1 UN1549 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony compounds, inorganic, solid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Antimony lactate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1550, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Antimony lactate 6.1 UN1550 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony lactate — Postal shipping restrictions by item category


**Item category:** Antimony pentachloride, liquid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1730, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Antimony pentachloride, liquid 8 UN1730 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony pentachloride, liquid — Postal shipping restrictions by item category


**Item category:** Antimony pentachloride, solutions

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1731, packing group II, III; domestic mail air: 8A; domestic mail surface: 8A

> Antimony pentachloride, solutions 8 UN1731 II, III 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony pentachloride, solutions — Postal shipping restrictions by item category


**Item category:** Antimony pentafluoride

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1732, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Antimony pentafluoride 8 UN1732 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony pentafluoride — Postal shipping restrictions by item category


**Item category:** Antimony potassium tartrate

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1551, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Antimony potassium tartrate 6.1 UN1551 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony potassium tartrate — Postal shipping restrictions by item category


**Item category:** Antimony powder

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2871, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Antimony powder 6.1 UN2871 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony powder — Postal shipping restrictions by item category


**Item category:** Antimony sulfide and a chlorate, mixtures of

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Antimony sulfide and a chlorate, mixtures of Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony sulfide and a chlorate, mixtures of — Postal shipping restrictions by item category


**Item category:** Antimony tribromide, solid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, NA1549, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony tribromide, solid 8 NA1549 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony tribromide, solid — Postal shipping restrictions by item category


**Item category:** Antimony tribromide, solution

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, NA1549, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony tribromide, solution 8 NA1549 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony tribromide, solution — Postal shipping restrictions by item category


**Item category:** Antimony trichloride, liquid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1733, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony trichloride, liquid 8 UN1733 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony trichloride, liquid — Postal shipping restrictions by item category


**Item category:** Antimony trichloride, solid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN1733, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony trichloride, solid 8 UN1733 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony trichloride, solid — Postal shipping restrictions by item category


**Item category:** Antimony, trifluoride, solid

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, NA1549, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony, trifluoride, solid 8 NA1549 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony, trifluoride, solid — Postal shipping restrictions by item category


**Item category:** Antimony, trifluoride, solution

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, NA1549, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Antimony, trifluoride, solution 8 NA1549 II 8A 8A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Antimony, trifluoride, solution — Postal shipping restrictions by item category


**Item category:** Argon, refrigerated liquid (cryogenic liquid)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.2, UN1951, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Argon, refrigerated liquid (cryogenic liquid) 2.2 UN1951 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Argon, refrigerated liquid (cryogenic liquid) — Postal shipping restrictions by item category


**Item category:** Arsenic acid, liquid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1553, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic acid, liquid 6.1 UN1553 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic acid, liquid — Postal shipping restrictions by item category


**Item category:** Arsenic acid, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1554, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic acid, solid 6.1 UN1554 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic acid, solid — Postal shipping restrictions by item category


**Item category:** Arsenic bromide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1555, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic bromide 6.1 UN1555 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic bromide — Postal shipping restrictions by item category


**Item category:** Arsenic compounds, liquid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1556, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic compounds, liquid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s. 6.1 UN1556 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic compounds, liquid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Arsenic compounds, solid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1557, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic compounds, solid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s. 6.1 UN1557 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic compounds, solid, n.o.s. inorganic, including arsenates, n.o.s.; arsenites, n.o.s.; arsenic sulfides, n.o.s.; and organic compounds of arsenic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Arsenic pentoxide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1559, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic pentoxide 6.1 UN1559 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic pentoxide — Postal shipping restrictions by item category


**Item category:** Arsenic sulfide and a chlorate, mixtures of

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Arsenic sulfide and a chlorate, mixtures of Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic sulfide and a chlorate, mixtures of — Postal shipping restrictions by item category


**Item category:** Arsenic sulfide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, NA1557, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic sulfide 6.1 NA1557 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic sulfide — Postal shipping restrictions by item category


**Item category:** Arsenic trichloride

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1560, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic trichloride 6.1 UN1560 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic trichloride — Postal shipping restrictions by item category


**Item category:** Arsenic trioxide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1561, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic trioxide 6.1 UN1561 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic trioxide — Postal shipping restrictions by item category


**Item category:** Arsenic trisulfide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, NA1557, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic trisulfide 6.1 NA1557 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic trisulfide — Postal shipping restrictions by item category


**Item category:** Arsenic

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1558, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenic 6.1 UN1558 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenic — Postal shipping restrictions by item category


**Item category:** Arsenical dust

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1562, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenical dust 6.1 UN1562 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenical dust — Postal shipping restrictions by item category


**Item category:** Arsenical pesticides, liquid, flammable, toxic, flashpoint less than 23° C

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 3, UN2760, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenical pesticides, liquid, flammable, toxic, flashpoint less than 23° C 3 UN2760 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenical pesticides, liquid, flammable, toxic, flashpoint less than 23° C — Postal shipping restrictions by item category


**Item category:** Arsenical pesticides, liquid, toxic, flammable flashpoint not less than 23° C

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2993, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenical pesticides, liquid, toxic, flammable flashpoint not less than 23° C 6.1 UN2993 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenical pesticides, liquid, toxic, flammable flashpoint not less than 23° C — Postal shipping restrictions by item category


**Item category:** Arsenical pesticides, liquid, toxic

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2994, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenical pesticides, liquid, toxic 6.1 UN2994 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenical pesticides, liquid, toxic — Postal shipping restrictions by item category


**Item category:** Arsenical pesticides, solid, toxic

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN2759, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsenical pesticides, solid, toxic 6.1 UN2759 I, II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsenical pesticides, solid, toxic — Postal shipping restrictions by item category


**Item category:** Arsine

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.3, UN2188, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Arsine 2.3 UN2188 n/a Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Arsine — Postal shipping restrictions by item category


**Item category:** Articles, explosive, extremely insensitive or Articles, EEI

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.6N, UN0486, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Articles, explosive, extremely insensitive or Articles, EEI 1.6N UN0486 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Articles, explosive, extremely insensitive or Articles, EEI — Postal shipping restrictions by item category


**Item category:** Articles, explosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.4S, UN0349, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Articles, explosive, n.o.s. 1.4S UN0349 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Articles, explosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Articles made from natural or depleted uranium or natural thorium (UN2909)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation

**Conditions:** Mailable if activity does not exceed limits in Exhibit 347.22; classified as excepted package per 49 CFR 172.101; must follow Packaging Instruction 7A

> UN2909: Manufactured articles containing only natural or depleted uranium or thorium, categorized as excepted package-articles manufactured from uranium or depleted uranium or natural thorium under 49 CFR § 172.101.

Source: <https://pe.usps.com/text/pub52/pub52c3_026.htm>

Articles made from natural or depleted uranium or natural thorium (UN2909) — Postal shipping restrictions by item category


**Item category:** Articles, pressurized pneumatic or Hydraulic containing nonflammable gas

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 2.2, UN3164, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Articles, pressurized pneumatic or Hydraulic containing nonflammable gas 2.2 UN3164 n/a 2B 2B

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Articles, pressurized pneumatic or Hydraulic containing nonflammable gas — Postal shipping restrictions by item category


**Item category:** Articles, pyrophoric

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.2L, UN0380, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Articles, pyrophoric 1.2L UN0380 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Articles, pyrophoric — Postal shipping restrictions by item category


**Item category:** Articles, pyrotechnic for technical purposes

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1G, UN0428, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Articles, pyrotechnic for technical purposes 1.1G UN0428 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Articles, pyrotechnic for technical purposes — Postal shipping restrictions by item category


**Item category:** Asbestos

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 9, NA2212, packing group III; domestic mail air: Prohibited; domestic mail surface: 9C

> Asbestos 9 NA2212 III Prohibited 9C

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Asbestos — Postal shipping restrictions by item category


**Item category:** Ascaridole (organic peroxide)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Ascaridole (organic peroxide) Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Ascaridole (organic peroxide) — Postal shipping restrictions by item category


**Item category:** Asphalt, at or above its flashpoint

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 3, NA1999, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Asphalt, at or above its flashpoint 3 NA1999 III Prohibited 3A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Asphalt, at or above its flashpoint — Postal shipping restrictions by item category


**Item category:** Audible fire alarm systems powered by compressed gas

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation

**Conditions:** Acceptable via surface transportation if comply with conditions in Packaging Instruction 2E

> Audible Fire Alarm Systems: These systems, if powered by compressed gas, are acceptable in domestic mail via surface transportation if they comply with conditions in Packaging Instruction 2E

Source: <https://pe.usps.com/text/pub52/pub52c3_021.htm>

Audible fire alarm systems powered by compressed gas — Postal shipping restrictions by item category


**Item category:** Aviation regulated solid, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 9, UN3335, packing group n/a; domestic mail air: 9C; domestic mail surface: 9C

> Aviation regulated solid, n.o.s. 9 UN3335 n/a 9C 9C

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Aviation regulated solid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Azaurolic, acid (salt of), (dry)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azaurolic, acid (salt of), (dry) Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azaurolic, acid (salt of), (dry) — Postal shipping restrictions by item category


**Item category:** Azido guanidine picrate (dry)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azido guanidine picrate (dry) Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azido guanidine picrate (dry) — Postal shipping restrictions by item category


**Item category:** Azido hydroxy tetrazole (mercury and silver salts)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azido hydroxy tetrazole (mercury and silver salts) Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azido hydroxy tetrazole (mercury and silver salts) — Postal shipping restrictions by item category


**Item category:** Azidodithiocarbonic acid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azidodithiocarbonic acid Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azidodithiocarbonic acid — Postal shipping restrictions by item category


**Item category:** Azidoethyl nitrate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azidoethyl nitrate Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azidoethyl nitrate — Postal shipping restrictions by item category


**Item category:** Azodicarbonamide

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.1, UN3242, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Azodicarbonamide 4.1 UN3242 II Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azodicarbonamide — Postal shipping restrictions by item category


**Item category:** Azotetrazole (dry)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Listed as Forbidden in the Pub 52 Appendix A mailability guide; Prohibited in domestic mail by air and by surface.

> Azotetrazole (dry) Forbidden Prohibited Prohibited Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Azotetrazole (dry) — Postal shipping restrictions by item category


**Item category:** Barium alloys, pyrophic

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.2, UN1854, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium alloys, pyrophic 4.2 UN1854 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium alloys, pyrophic — Postal shipping restrictions by item category


**Item category:** Barium azide, dry or wetted with less than 50 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1A, UN0224, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium azide, dry or wetted with less than 50 percent water, by mass 1.1A UN0224 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium azide, dry or wetted with less than 50 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Barium azide, wetted with not less than 50 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.1, UN1571, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium azide, wetted with not less than 50 percent water, by mass 4.1 UN1571 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium azide, wetted with not less than 50 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Barium bromate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN2719, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium bromate 5.1 UN2719 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium bromate — Postal shipping restrictions by item category


**Item category:** Barium chlorate, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1445, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium chlorate, solid 5.1 UN1445 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium chlorate, solid — Postal shipping restrictions by item category


**Item category:** Barium chlorate, solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN3405, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium chlorate, solution 5.1 UN3405 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium chlorate, solution — Postal shipping restrictions by item category


**Item category:** Barium compounds, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1564, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium compounds, n.o.s. 6.1 UN1564 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium compounds, n.o.s. — Postal shipping restrictions by item category


**Item category:** Barium cyanide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1565, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium cyanide 6.1 UN1565 I Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium cyanide — Postal shipping restrictions by item category


**Item category:** Barium hypochlorite with more than 22 percent available chlorine

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN2741, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Barium hypochlorite with more than 22 percent available chlorine 5.1 UN2741 II 5A 5A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium hypochlorite with more than 22 percent available chlorine — Postal shipping restrictions by item category


**Item category:** Barium nitrate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1446, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium nitrate 5.1 UN1446 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium nitrate — Postal shipping restrictions by item category


**Item category:** Barium oxide

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 6.1, UN1884, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Barium oxide 6.1 UN1884 III 6A 6A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium oxide — Postal shipping restrictions by item category


**Item category:** Barium perchlorate, solid

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1447, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium perchlorate, solid 5.1 UN1447 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium perchlorate, solid — Postal shipping restrictions by item category


**Item category:** Barium perchlorate, solution

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN3406, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium perchlorate, solution 5.1 UN3406 II, III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium perchlorate, solution — Postal shipping restrictions by item category


**Item category:** Barium permanganate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1448, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium permanganate 5.1 UN1448 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium permanganate — Postal shipping restrictions by item category


**Item category:** Barium peroxide

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 5.1, UN1449, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium peroxide 5.1 UN1449 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium peroxide — Postal shipping restrictions by item category


**Item category:** Barium styphnate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 1.1A, NA0473, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Barium styphnate 1.1A NA0473 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium styphnate — Postal shipping restrictions by item category


**Item category:** Barium

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail: surface only (air prohibited)

**Conditions:** Hazard class 4.3, UN1400, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Barium 4.3 UN1400 II Prohibited 4A

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Barium — Postal shipping restrictions by item category


**Item category:** Batteries, containing sodium

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 4.3, UN3292, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Batteries, containing sodium 4.3 UN3292 II Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Batteries, containing sodium — Postal shipping restrictions by item category


**Item category:** Batteries, dry, containing potassium hydroxide solid, electric, storage

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN3028, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Batteries, dry, containing potassium hydroxide solid, electric, storage 8 UN3028 III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Batteries, dry, containing potassium hydroxide solid, electric, storage — Postal shipping restrictions by item category


**Item category:** Batteries, wet, filled with alkali,electric storage

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2795, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Batteries, wet, filled with alkali,electric storage 8 UN2795 III Prohibited Prohibited

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Batteries, wet, filled with alkali,electric storage — Postal shipping restrictions by item category


**Item category:** Batteries, wet, nonspillable, electric storage

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail (air and surface)

**Conditions:** Hazard class 8, UN2800, packing group III; domestic mail air: 8B; domestic mail surface: 8B

> Batteries, wet, nonspillable, electric storage 8 UN2800 III 8B 8B

Source: <https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf>

Batteries, wet, nonspillable, electric storage — Postal shipping restrictions by item category


**Item category:** Batteries with liquid electrolyte (UN2794, UN2795)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Nonmailable; includes automobile lead acid batteries except for non-spillable type

> Batteries with Liquid Electrolyte (UN2794, UN2795): Includes automobile lead acid batteries, except for the non-spillable type permitted under 348.22 .

Source: <https://pe.usps.com/text/pub52/pub52c3_027.htm>

Batteries with liquid electrolyte (UN2794, UN2795) — Postal shipping restrictions by item category