**Item category:** Ethane-Propane mixture, refrigerated liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, NA1961, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethane-Propane mixture, refrigerated liquid 2.1 NA1961 n/a Prohibited Prohibited

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

Ethane-Propane mixture, refrigerated liquid — Postal shipping restrictions by item category


**Item category:** Ethane, refrigerated liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN1961, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethane, refrigerated liquid 2.1 UN1961 n/a Prohibited Prohibited

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

Ethane, refrigerated liquid — Postal shipping restrictions by item category


**Item category:** Ethanol and gasoline mixture or Ethanol and motor spirit mixture or Ethanol and petrol mixture, with more than 10% ethanol.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN3475, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethanol and gasoline mixture or Ethanol and motor spirit mixture or Ethanol and petrol mixture, with more than 10% ethanol. 3 UN3475 II Prohibited Prohibited

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

Ethanol and gasoline mixture or Ethanol and motor spirit mixture or Ethanol and petrol mixture, with more than 10% ethanol. — Postal shipping restrictions by item category


**Item category:** Ethanol-based flammable liquids or solids

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via air only

**Conditions:** Mailable by domestic air only with prior written authorization from director, Product Classification; quantity and packaging limits apply based on ethanol concentration

> Flammable liquids or solids containing ethanol (ethyl alcohol) are mailable by domestic air only with prior written authorization.

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

Ethanol-based flammable liquids or solids — Postal shipping restrictions by item category


**Item category:** Ethanolamine or Ethanolamine solutions

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN2491, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Ethanolamine or Ethanolamine solutions 8 UN2491 III 8A 8A

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

Ethanolamine or Ethanolamine solutions — Postal shipping restrictions by item category


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

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN3271, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethers, n.o.s. 3 UN3271 II, III Prohibited 3A

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

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


**Item category:** Ethyl 2-chloropropionate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2935, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl 2-chloropropionate 3 UN2935 III Prohibited 3A

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

Ethyl 2-chloropropionate — Postal shipping restrictions by item category


**Item category:** Ethyl acetate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1173, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl acetate 3 UN1173 II Prohibited 3A

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

Ethyl acetate — Postal shipping restrictions by item category


**Item category:** Ethyl acrylate, stabilized

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1917, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl acrylate, stabilized 3 UN1917 II Prohibited 3A

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

Ethyl acrylate, stabilized — Postal shipping restrictions by item category


**Item category:** Ethyl amyl ketone

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2271, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl amyl ketone 3 UN2271 III Prohibited 3A

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

Ethyl amyl ketone — Postal shipping restrictions by item category


**Item category:** Ethyl borate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1176, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl borate 3 UN1176 II Prohibited 3A

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

Ethyl borate — Postal shipping restrictions by item category


**Item category:** Ethyl bromide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1891, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl bromide 3 UN1891 II, III Prohibited 3A

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

Ethyl bromide — Postal shipping restrictions by item category


**Item category:** Ethyl bromoacetate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1603, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl bromoacetate 6.1 UN1603 II Prohibited Prohibited

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

Ethyl bromoacetate — Postal shipping restrictions by item category


**Item category:** Ethyl butyl ether

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1179, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl butyl ether 3 UN1179 II Prohibited 3A

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

Ethyl butyl ether — Postal shipping restrictions by item category


**Item category:** Ethyl butyrate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1180, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl butyrate 3 UN1180 III Prohibited 3A

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

Ethyl butyrate — Postal shipping restrictions by item category


**Item category:** Ethyl chloride

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN1037, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl chloride 2.1 UN1037 n/a Prohibited Prohibited

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

Ethyl chloride — Postal shipping restrictions by item category


**Item category:** Ethyl chloroacetate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1181, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl chloroacetate 6.1 UN1181 II Prohibited Prohibited

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

Ethyl chloroacetate — Postal shipping restrictions by item category


**Item category:** Ethyl chloroformate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1182, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl chloroformate 6.1 UN1182 I Prohibited Prohibited

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

Ethyl chloroformate — Postal shipping restrictions by item category


**Item category:** Ethyl chlorothioformate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN2826, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl chlorothioformate 8 UN2826 II Prohibited Prohibited

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

Ethyl chlorothioformate — Postal shipping restrictions by item category


**Item category:** Ethyl crotonate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1862, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl crotonate 3 UN1862 II Prohibited 3A

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

Ethyl crotonate — Postal shipping restrictions by item category


**Item category:** Ethyl fluoride or Refrigerant gas R 161

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.1, UN2453, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

> Ethyl fluoride or Refrigerant gas R 161 2.1 UN2453 n/a Prohibited 2A

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

Ethyl fluoride or Refrigerant gas R 161 — Postal shipping restrictions by item category


**Item category:** Ethyl formate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1190, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl formate 3 UN1190 II Prohibited 3A

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

Ethyl formate — Postal shipping restrictions by item category


**Item category:** Ethyl hydroperoxide

**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.

> Ethyl hydroperoxide Forbidden Prohibited Prohibited Prohibited Prohibited

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

Ethyl hydroperoxide — Postal shipping restrictions by item category


**Item category:** Ethyl isobutyrate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2385, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl isobutyrate 3 UN2385 II Prohibited 3A

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

Ethyl isobutyrate — Postal shipping restrictions by item category


**Item category:** Ethyl isocyanate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2481, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl isocyanate 3 UN2481 I Prohibited Prohibited

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

Ethyl isocyanate — Postal shipping restrictions by item category


**Item category:** Ethyl lactate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1192, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl lactate 3 UN1192 III Prohibited 3A

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

Ethyl lactate — Postal shipping restrictions by item category


**Item category:** Ethyl mercaptan

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2363, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl mercaptan 3 UN2363 I Prohibited Prohibited

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

Ethyl mercaptan — Postal shipping restrictions by item category


**Item category:** Ethyl methacrylate, stabilized

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2277, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl methacrylate, stabilized 3 UN2277 II Prohibited 3A

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

Ethyl methacrylate, stabilized — Postal shipping restrictions by item category


**Item category:** Ethyl methyl ether

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN1039, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl methyl ether 2.1 UN1039 n/a Prohibited Prohibited

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

Ethyl methyl ether — Postal shipping restrictions by item category


**Item category:** Ethyl methyl ketone or Methyl ethyl ketone

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1193, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl methyl ketone or Methyl ethyl ketone 3 UN1193 II Prohibited 3A

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

Ethyl methyl ketone or Methyl ethyl ketone — Postal shipping restrictions by item category


**Item category:** Ethyl nitrate solutions

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1194, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl nitrate solutions 3 UN1194 I Prohibited Prohibited

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

Ethyl nitrate solutions — Postal shipping restrictions by item category


**Item category:** Ethyl orthoformate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2524, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl orthoformate 3 UN2524 III Prohibited 3A

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

Ethyl orthoformate — Postal shipping restrictions by item category


**Item category:** Ethyl oxalate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 6.1, UN2525, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Ethyl oxalate 6.1 UN2525 III 6A 6A

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

Ethyl oxalate — Postal shipping restrictions by item category


**Item category:** Ethyl perchlorate

**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.

> Ethyl perchlorate Forbidden Prohibited Prohibited Prohibited Prohibited

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

Ethyl perchlorate — Postal shipping restrictions by item category


**Item category:** Ethyl phosphonothioic dichloride, anhydrous

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, NA2927, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl phosphonothioic dichloride, anhydrous 6.1 NA2927 I Prohibited Prohibited

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

Ethyl phosphonothioic dichloride, anhydrous — Postal shipping restrictions by item category


**Item category:** Ethyl phosphonous dichloride, anhydrous pyrophoric liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, NA2845, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl phosphonous dichloride, anhydrous pyrophoric liquid 6.1 NA2845 I Prohibited Prohibited

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

Ethyl phosphonous dichloride, anhydrous pyrophoric liquid — Postal shipping restrictions by item category


**Item category:** Ethyl phosphorodichloridate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, NA2927, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyl phosphorodichloridate 6.1 NA2927 I Prohibited Prohibited

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

Ethyl phosphorodichloridate — Postal shipping restrictions by item category


**Item category:** Ethyl propionate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1195, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl propionate 3 UN1195 II Prohibited 3A

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

Ethyl propionate — Postal shipping restrictions by item category


**Item category:** Ethyl propyl ether

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2615, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethyl propyl ether 3 UN2615 II Prohibited 3A

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

Ethyl propyl ether — Postal shipping restrictions by item category


**Item category:** Ethylacetylene, stabilized

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN2452, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylacetylene, stabilized 2.1 UN2452 n/a Prohibited Prohibited

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

Ethylacetylene, stabilized — Postal shipping restrictions by item category


**Item category:** Ethylamine, aqueous solution with not less than 50 percent but not more than 70 percent ethylamine

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2270, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylamine, aqueous solution with not less than 50 percent but not more than 70 percent ethylamine 3 UN2270 II Prohibited Prohibited

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

Ethylamine, aqueous solution with not less than 50 percent but not more than 70 percent ethylamine — Postal shipping restrictions by item category


**Item category:** Ethylamine

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN1036, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylamine 2.1 UN1036 n/a Prohibited Prohibited

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

Ethylamine — Postal shipping restrictions by item category


**Item category:** Ethylbenzene

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1175, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylbenzene 3 UN1175 II Prohibited 3A

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

Ethylbenzene — Postal shipping restrictions by item category


**Item category:** Ethyldichloroarsine

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1892, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyldichloroarsine 6.1 UN1892 I Prohibited Prohibited

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

Ethyldichloroarsine — Postal shipping restrictions by item category


**Item category:** Ethyldichlorosilane

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN1183, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyldichlorosilane 4.3 UN1183 I Prohibited Prohibited

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

Ethyldichlorosilane — Postal shipping restrictions by item category


**Item category:** Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN3138, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene 2.1 UN3138 n/a Prohibited Prohibited

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

Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene — Postal shipping restrictions by item category


**Item category:** Ethylene chlorohydrin

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1135, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene chlorohydrin 6.1 UN1135 I Prohibited Prohibited

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

Ethylene chlorohydrin — Postal shipping restrictions by item category


**Item category:** Ethylene diamine diperchlorate

**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.

> Ethylene diamine diperchlorate Forbidden Prohibited Prohibited Prohibited Prohibited

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

Ethylene diamine diperchlorate — Postal shipping restrictions by item category


**Item category:** Ethylene dibromide

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1605, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene dibromide 6.1 UN1605 I Prohibited Prohibited

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

Ethylene dibromide — Postal shipping restrictions by item category


**Item category:** Ethylene dichloride

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1184, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene dichloride 3 UN1184 II Prohibited Prohibited

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

Ethylene dichloride — Postal shipping restrictions by item category


**Item category:** Ethylene glycol diethyl ether

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1153, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylene glycol diethyl ether 3 UN1153 III Prohibited 3A

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

Ethylene glycol diethyl ether — Postal shipping restrictions by item category


**Item category:** Ethylene glycol dinitrate

**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.

> Ethylene glycol dinitrate Forbidden Prohibited Prohibited Prohibited Prohibited

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

Ethylene glycol dinitrate — Postal shipping restrictions by item category


**Item category:** Ethylene glycol monoethyl ether acetate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1172, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylene glycol monoethyl ether acetate 3 UN1172 III Prohibited 3A

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

Ethylene glycol monoethyl ether acetate — Postal shipping restrictions by item category


**Item category:** Ethylene glycol monoethyl ether

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1171, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylene glycol monoethyl ether 3 UN1171 III Prohibited 3A

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

Ethylene glycol monoethyl ether — Postal shipping restrictions by item category


**Item category:** Ethylene glycol monomethyl ether acetate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1189, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylene glycol monomethyl ether acetate 3 UN1189 III Prohibited 3A

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

Ethylene glycol monomethyl ether acetate — Postal shipping restrictions by item category


**Item category:** Ethylene glycol monomethyl ether

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1188, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Ethylene glycol monomethyl ether 3 UN1188 III Prohibited 3A

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

Ethylene glycol monomethyl ether — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and carbon dioxide mixtures with more than 87 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, UN3300, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene oxide and carbon dioxide mixtures with more than 87 percent ethylene oxide 2.3 UN3300 n/a Prohibited Prohibited

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

Ethylene oxide and carbon dioxide mixtures with more than 87 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.1, UN1041, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

> Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide 2.1 UN1041 n/a Prohibited 2A

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

Ethylene oxide and carbon dioxide mixtures with more than 9 percent but not more than 87 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN1952, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide 2.2 UN1952 n/a 2B 2B

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

Ethylene oxide and carbon dioxide mixtures with not more than 9 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN3297, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide 2.2 UN3297 n/a 2B 2B

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

Ethylene oxide and chlorotetrafluoroethane mixture with not more than 8.8 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN3070, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxide 2.2 UN3070 n/a 2B 2B

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

Ethylene oxide and dichlorodifluoromethane mixture with not more than 12.5 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN3298, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide 2.2 UN3298 n/a 2B 2B

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

Ethylene oxide and pentafluoroethane mixture with not more than 7.9 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and propylene oxide mixtures with not more than 30 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2983, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene oxide and propylene oxide mixtures with not more than 30 percent ethylene oxide 3 UN2983 I Prohibited Prohibited

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

Ethylene oxide and propylene oxide mixtures with not more than 30 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN3299, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide 2.2 UN3299 n/a 2B 2B

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

Ethylene oxide and tetrafluoroethane mixture with not more than 5.6 percent ethylene oxide — Postal shipping restrictions by item category


**Item category:** Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, UN1040, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C 2.3 UN1040 n/a Prohibited Prohibited

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

Ethylene oxide or Ethylene oxide with nitrogen up to a total pressure of 1MPa (10 bar) at 50° C — Postal shipping restrictions by item category


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

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN1038, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylene, refrigerated liquid (cryogenic liquid) 2.1 UN1038 n/a Prohibited Prohibited

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

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


**Item category:** Ethylene

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.1, UN1962, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

> Ethylene 2.1 UN1962 n/a Prohibited 2A

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

Ethylene — Postal shipping restrictions by item category


**Item category:** Ethylenediamine

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1604, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Ethylenediamine 8 UN1604 II 8A 8A

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

Ethylenediamine — Postal shipping restrictions by item category


**Item category:** Ethyleneimine, stabilized

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1185, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyleneimine, stabilized 6.1 UN1185 I Prohibited Prohibited

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

Ethyleneimine, stabilized — Postal shipping restrictions by item category


**Item category:** Ethylphenyldichlorosilane

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN2435, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethylphenyldichlorosilane 8 UN2435 II Prohibited Prohibited

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

Ethylphenyldichlorosilane — Postal shipping restrictions by item category


**Item category:** Ethyltrichlorosilane

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1196, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ethyltrichlorosilane 3 UN1196 II Prohibited Prohibited

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

Ethyltrichlorosilane — Postal shipping restrictions by item category


**Item category:** Excessive dry ice — domestic air (over 5 lbs)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via air transportation

**Conditions:** Dry ice exceeding 5 pounds per mailpiece is prohibited from air transport in domestic mail

> Excessive Dry Ice: Dry ice exceeding 5 pounds per mailpiece is prohibited from air transport in domestic mail.

Source: <https://pe.usps.com/text/pub52/pub52c3_028.htm>

Excessive dry ice — domestic air (over 5 lbs) — Postal shipping restrictions by item category


**Item category:** Exempt human or animal specimens

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** all domestic mail

**Conditions:** Not regulated as hazardous materials; must be triple-packaged per 346.327; outer packaging must be marked 'Exempt human specimen' or 'Exempt animal specimen'

> Exempt human or animal specimens as defined in 346.12 (d) , are not regulated as hazardous materials but must be packaged to meet mailing standards, including being triple-packaged

Source: <https://pe.usps.com/text/pub52/pub52c3_025.htm>

Exempt human or animal specimens — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type B or Agent blasting, Type B

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.5D, UN0331, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type B or Agent blasting, Type B 1.5D UN0331 II Prohibited Prohibited

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

Explosive, blasting, type B or Agent blasting, Type B — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type B

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0082, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type B 1.1D UN0082 II Prohibited Prohibited

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

Explosive, blasting, type B — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type C

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0083, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type C 1.1D UN0083 II Prohibited Prohibited

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

Explosive, blasting, type C — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type D

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0084, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type D 1.1D UN0084 II Prohibited Prohibited

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

Explosive, blasting, type D — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type E or Agent blasting, Type E

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.5D, UN0332, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type E or Agent blasting, Type E 1.5D UN0332 II Prohibited Prohibited

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

Explosive, blasting, type E or Agent blasting, Type E — Postal shipping restrictions by item category


**Item category:** Explosive, blasting, type E

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0241, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Explosive, blasting, type E 1.1D UN0241 II Prohibited Prohibited

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

Explosive, blasting, type E — Postal shipping restrictions by item category


**Item category:** Explosive, forbidden. See 49 CFR 173.54

**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.

> Explosive, forbidden. See 49 CFR 173.54 Forbidden Prohibited Prohibited Prohibited Prohibited

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

Explosive, forbidden. See 49 CFR 173.54 — Postal shipping restrictions by item category


**Item category:** Explosives

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** USPS never allows explosives to be mailed

> Note the USPS never allows explosives or metal mercury (such as mercury thermometers, mercury barometers, mercury blood pressure monitors) to be mailed.

Source: <https://www.ecommercebytes.com/2026/07/05/new-usps-noncompliance-fee-could-take-sellers-by-surprise/>

Explosives — Postal shipping restrictions by item category


**Item category:** Explosives (Hazard Class 1) — domestic air

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via air transportation

**Conditions:** All explosives are prohibited from domestic air mail

> Domestic Mail via Air Transportation: All explosives are prohibited.

Source: <https://pe.usps.com/text/pub52/pub52c3_020.htm>

Explosives (Hazard Class 1) — domestic air — Postal shipping restrictions by item category


**Item category:** Explosives (Hazard Class 1) — domestic surface

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via surface transportation

**Conditions:** Generally prohibited; exceptions exist for Division 1.4S toy propellant devices and safety fuses with prior written approval

> Domestic Mail via Surface Transportation: Generally, explosives are prohibited, with exceptions for Division 1.4S toy propellant devices and safety fuses that have been approved by the director, Product Classification before mailing

Source: <https://pe.usps.com/text/pub52/pub52c3_020.htm>

Explosives (Hazard Class 1) — domestic surface — Postal shipping restrictions by item category


**Item category:** Explosives (Hazard Class 1) — international mail

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** international mail

**Conditions:** All explosives are prohibited from international mail

> International Mail : All explosives are prohibited.

Source: <https://pe.usps.com/text/pub52/pub52c3_020.htm>

Explosives (Hazard Class 1) — international mail — Postal shipping restrictions by item category


**Item category:** Explosives

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic

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

> an'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 Publicatio

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


**Item category:** Extracts, liquid, flavor, or aroma

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1197, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Extracts, liquid, flavor, or aroma 3 UN1197 II, III Prohibited 3A

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

Extracts, liquid, flavor, or aroma — Postal shipping restrictions by item category


**Item category:** Ferric arsenite

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1607, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ferric arsenite 6.1 UN1607 II Prohibited Prohibited

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

Ferric arsenite — Postal shipping restrictions by item category


**Item category:** Ferric chloride, anhydrous

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1773, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Ferric chloride, anhydrous 8 UN1773 III 8A 8A

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

Ferric chloride, anhydrous — Postal shipping restrictions by item category


**Item category:** Ferric chloride, solution

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN2582, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Ferric chloride, solution 8 UN2582 III 8A 8A

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

Ferric chloride, solution — Postal shipping restrictions by item category


**Item category:** Ferric nitrate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN1466, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Ferric nitrate 5.1 UN1466 III 5A 5A

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

Ferric nitrate — Postal shipping restrictions by item category


**Item category:** Ferrocerium

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN1323, packing group II; domestic mail air: Prohibited; domestic mail surface: 4A

> Ferrocerium 4.1 UN1323 II Prohibited 4A

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

Ferrocerium — Postal shipping restrictions by item category


**Item category:** Ferrosilicon, with 30 percent or more but less than 90 percent silicon

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.3, UN1408, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Ferrosilicon, with 30 percent or more but less than 90 percent silicon 4.3 UN1408 III Prohibited 4A

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

Ferrosilicon, with 30 percent or more but less than 90 percent silicon — Postal shipping restrictions by item category


**Item category:** Ferrous arsenate

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1608, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ferrous arsenate 6.1 UN1608 II Prohibited Prohibited

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

Ferrous arsenate — Postal shipping restrictions by item category


**Item category:** Ferrous chloride, solid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, NA1759, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Ferrous chloride, solid 8 NA1759 II 8A 8A

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

Ferrous chloride, solid — Postal shipping restrictions by item category


**Item category:** Ferrous chloride, solution

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, NA1760, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Ferrous chloride, solution 8 NA1760 II 8A 8A

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

Ferrous chloride, solution — Postal shipping restrictions by item category


**Item category:** Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN2793, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating 4.2 UN2793 III Prohibited Prohibited

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

Ferrous metal borings or Ferrous metal shavings or Ferrous metal turnings or Ferrous metal cuttings in a form liable to self-heating — Postal shipping restrictions by item category


**Item category:** Fertilizer ammoniating solution with free ammonia

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN1043, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Fertilizer ammoniating solution with free ammonia 2.2 UN1043 n/a 2B 2B

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

Fertilizer ammoniating solution with free ammonia — Postal shipping restrictions by item category


**Item category:** Fiber, vegetable, dry

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN3360, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fiber, vegetable, dry 4.1 UN3360 III Prohibited Prohibited

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

Fiber, vegetable, dry — Postal shipping restrictions by item category


**Item category:** Fibers, animal or Fibers, vegetable burnt, wet or damp

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN1372, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fibers, animal or Fibers, vegetable burnt, wet or damp 4.2 UN1372 III Prohibited Prohibited

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

Fibers, animal or Fibers, vegetable burnt, wet or damp — Postal shipping restrictions by item category


**Item category:** Fibers or Fabrics, animal or vegetable or Synthetic, n.o.s. with animal or vegetable oil

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN1373, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fibers or Fabrics, animal or vegetable or Synthetic, n.o.s. with animal or vegetable oil 4.2 UN1373 III Prohibited Prohibited

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

Fibers or Fabrics, animal or vegetable or Synthetic, n.o.s. with animal or vegetable oil — Postal shipping restrictions by item category


**Item category:** Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN1353, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s. 4.1 UN1353 III Prohibited Prohibited

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

Fibers or Fabrics impregnated with weakly nitrated nitrocellulose, n.o.s. — Postal shipping restrictions by item category


**Item category:** Films, nitrocellulose base, gelatine coated (except scrap)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN1324, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Films, nitrocellulose base, gelatine coated (except scrap) 4.1 UN1324 III Prohibited Prohibited

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

Films, nitrocellulose base, gelatine coated (except scrap) — Postal shipping restrictions by item category


**Item category:** Fire extinguisher charges, corrosive liquid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1774, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Fire extinguisher charges, corrosive liquid 8 UN1774 II 8A 8A

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

Fire extinguisher charges, corrosive liquid — Postal shipping restrictions by item category


**Item category:** Fire extinguishers containing compressed or liquified gas

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN1044, packing group n/a; domestic mail air: 2C; domestic mail surface: 2C

> Fire extinguishers containing compressed or liquified gas 2.2 UN1044 n/a 2C 2C

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

Fire extinguishers containing compressed or liquified gas — Postal shipping restrictions by item category


**Item category:** Fire extinguishers containing propellant explosives (UN0275, UN0276, UN0323, UN0381)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Fire extinguishers that contain propellant explosives are prohibited from mailing

> Fire Extinguishers (UN0275, UN0276, UN0323, or UN0381): Fire extinguishers that contain propellant explosives are prohibited from mailing.

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

Fire extinguishers containing propellant explosives (UN0275, UN0276, UN0323, UN0381) — Postal shipping restrictions by item category


**Item category:** Fire Extinguishers (UN1044) — Division 2.2 nonflammable compressed gas

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail

**Conditions:** Mailable if do not contain methyl bromide gas mixtures, meet DOT container specifications, hold nonflammable/nonpoisonous/noncorrosive gas; only one extinguisher per mailpiece

> Fire Extinguishers (UN1044): Division 2.2 nonflammable compressed gas. Fire extinguishers that contain nonflammable compressed gas are mailable if they do not contain methyl bromide gas mixtures

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

Fire Extinguishers (UN1044) — Division 2.2 nonflammable compressed gas — Postal shipping restrictions by item category


**Item category:** firearms - handguns (including pistols and revolvers)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail

**Conditions:** A firearm with a short stock designed to be held and fired by a single hand; includes pistols, revolvers, and firearms capable of being concealed on a person including short-barreled shotguns and short-barreled rifles

> Pistols, revolvers, and other firearms capable of being concealed on a person, including but not limited to, short-barreled shotguns and short-barreled rifles, are categorized as handguns.

Source: <https://pe.usps.com/text/pub52/pub52c4_009.htm>

firearms - handguns (including pistols and revolvers) — Postal shipping restrictions by item category

carrier, conditions, item_category, restriction_type, scope


**Item category:** firearms - short-barreled shotgun or rifle

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail

**Conditions:** A shotgun with one or more barrels less than 18 inches long or a rifle with one or more barrels less than 16 inches long, or any such weapon modified to have an overall length less than 26 inches

> A shotgun with one or more barrels less than 18 inches long or a rifle with one or more barrels less than 16 inches long.

Source: <https://pe.usps.com/text/pub52/pub52c4_009.htm>

firearms - short-barreled shotgun or rifle — Postal shipping restrictions by item category

carrier, conditions, item_category, scope


**Item category:** Firearms

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic

**Conditions:** Even though unloaded rifles and shotguns are mailable, mailers must comply with applicable regulations.

> Even though unloaded rifles and shotguns are mailable, mailers must comply with applicable regulations.

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

Firearms — Postal shipping restrictions by item category


**Item category:** Firelighters, solid with flammable liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN2623, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Firelighters, solid with flammable liquid 4.1 UN2623 III Prohibited Prohibited

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

Firelighters, solid with flammable liquid — Postal shipping restrictions by item category


**Item category:** Fireworks (Division 1.1, 1.2, 1.3, or 1.4)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** All types of fireworks are prohibited from mailing, including roman candles, skyrockets, firecrackers, and combinations

> All types of fireworks are prohibited from mailing.

Source: <https://pe.usps.com/text/pub52/pub52c3_020.htm>

Fireworks (Division 1.1, 1.2, 1.3, or 1.4) — Postal shipping restrictions by item category


**Item category:** Fireworks

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1G, UN0333, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fireworks 1.1G UN0333 II Prohibited Prohibited

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

Fireworks — Postal shipping restrictions by item category


**Item category:** First aid kits

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 9, UN3316, packing group not stated; domestic mail air: Prohibited; domestic mail surface: 9C

> First aid kits 9 UN3316 Prohibited 9C

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

First aid kits — Postal shipping restrictions by item category


**Item category:** Fish meal, stabilized or Fish scrap, stabilized

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 9, UN2216, packing group III; domestic mail air: 9C; domestic mail surface: 9C

> Fish meal, stabilized or Fish scrap, stabilized 9 UN2216 III 9C 9C

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

Fish meal, stabilized or Fish scrap, stabilized — Postal shipping restrictions by item category


**Item category:** Fish meal, unstabilized or Fish scrap, unstabilized

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN1374, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fish meal, unstabilized or Fish scrap, unstabilized 4.2 UN1374 II Prohibited Prohibited

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

Fish meal, unstabilized or Fish scrap, unstabilized — Postal shipping restrictions by item category


**Item category:** Flammable liquid, toxic, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN3286, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable liquid, toxic, corrosive, n.o.s. 3 UN3286 I, II Prohibited Prohibited

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

Flammable liquid, toxic, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable liquids, corrosive, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2924, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable liquids, corrosive, n.o.s. 3 UN2924 I, II Prohibited Prohibited

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

Flammable liquids, corrosive, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable liquids (Hazard Class 3) — domestic air

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via air transportation

**Conditions:** All flammable liquids are prohibited from domestic air mail

> Domestic Mail via Air Transportation: Flammable liquids are prohibited.

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

Flammable liquids (Hazard Class 3) — domestic air — Postal shipping restrictions by item category


**Item category:** Flammable liquids (Hazard Class 3) — international mail

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** international mail

**Conditions:** All flammable liquids are prohibited from international mail

> International Mail: Flammable liquids are prohibited.

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

Flammable liquids (Hazard Class 3) — international mail — Postal shipping restrictions by item category


**Item category:** Flammable liquids, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1993, packing group I, II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Flammable liquids, n.o.s. 3 UN1993 I, II, III Prohibited 3A

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

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


**Item category:** Flammable liquids, toxic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1992, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable liquids, toxic, n.o.s. 3 UN1992 I, II Prohibited Prohibited

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

Flammable liquids, toxic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable liquids with flashpoint above 20 F — domestic surface

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation only

**Conditions:** Mailable if qualifies as Limited Quantity surface material and meets criteria; must follow Packaging Instruction 3A

> Other flammable liquids may be mailed if they qualify as a Limited Quantity surface material and meet the criteria in Exhibit 343.21

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

Flammable liquids with flashpoint above 20 F — domestic surface — Postal shipping restrictions by item category


**Item category:** Flammable liquids with flashpoint at or below 20 F — domestic surface

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via surface transportation

**Conditions:** Flammable liquids with a flashpoint at or below 20 F (-7 C) are prohibited from domestic surface mail

> Domestic Mail via Surface Transportation: Flammable liquids with a flashpoint at or below 20° F (-7° C) are prohibited.

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

Flammable liquids with flashpoint at or below 20 F — domestic surface — Postal shipping restrictions by item category


**Item category:** Flammable Nail Polishes

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic

**Conditions:** Some nail polishes may only be sent by ground transportation

> Some nail polishes may only be sent by ground transportation.

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

Flammable Nail Polishes — Postal shipping restrictions by item category


**Item category:** Flammable or Combustible Paint

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic

**Conditions:** provided the material can qualify as a consumer commodity material or ORM-D (for surface only), and is sent within the quantity limitations and packaging requirements

> Flammable or combustible paint and paint-related items are generally accepted for mailing, provided the material can qualify as a consumer commodity material or ORM-D (for surface only), and is sent within the quantity limitations and packaging requirements.

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

Flammable or Combustible Paint — Postal shipping restrictions by item category


**Item category:** Flammable solid, corrosive, inorganic, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN3180, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Flammable solid, corrosive, inorganic, n.o.s. 4.1 UN3180 II, III Prohibited 4A

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

Flammable solid, corrosive, inorganic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solid, inorganic, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN3178, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Flammable solid, inorganic, n.o.s. 4.1 UN3178 II, III Prohibited 4A

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

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


**Item category:** Flammable solid, organic, molten, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN3176, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Flammable solid, organic, molten, n.o.s. 4.1 UN3176 II, III Prohibited 4A

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

Flammable solid, organic, molten, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solid, oxidizing, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN3097, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable solid, oxidizing, n.o.s. 4.1 UN3097 II, III Prohibited Prohibited

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

Flammable solid, oxidizing, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solid, toxic, inorganic, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN3179, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Flammable solid, toxic, inorganic, n.o.s. 4.1 UN3179 II, III Prohibited 4A

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

Flammable solid, toxic, inorganic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solids, corrosive, organic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN2925, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable solids, corrosive, organic, n.o.s. 4.1 UN2925 II Prohibited Prohibited

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

Flammable solids, corrosive, organic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solids (Hazard Class 4) — domestic air

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic mail via air transportation

**Conditions:** All flammable solids are prohibited from domestic air mail

> Domestic Mail via Air Transportation: All flammable solids are prohibited.

Source: <https://pe.usps.com/text/pub52/pub52c3_023.htm>

Flammable solids (Hazard Class 4) — domestic air — Postal shipping restrictions by item category


**Item category:** Flammable solids (Hazard Class 4) — international mail

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** international mail

**Conditions:** All flammable solids are prohibited from international mail

> International Mail: All flammable solids are prohibited.

Source: <https://pe.usps.com/text/pub52/pub52c3_023.htm>

Flammable solids (Hazard Class 4) — international mail — Postal shipping restrictions by item category


**Item category:** Flammable solids, organic, n.o.s.

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN1325, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 4A

> Flammable solids, organic, n.o.s. 4.1 UN1325 II, III Prohibited 4A

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

Flammable solids, organic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flammable solids qualifying as Limited Quantity surface materials

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation

**Conditions:** Flammable solids that qualify as Limited Quantity surface materials are permitted in domestic mail via surface transportation

> Domestic Mail via Surface Transportation: Flammable solids that qualify as Limited Quantity surface materials are permitted.

Source: <https://pe.usps.com/text/pub52/pub52c3_023.htm>

Flammable solids qualifying as Limited Quantity surface materials — Postal shipping restrictions by item category


**Item category:** Flammable solids, toxic, organic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN2926, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flammable solids, toxic, organic, n.o.s. 4.1 UN2926 II Prohibited Prohibited

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

Flammable solids, toxic, organic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Flares, aerial

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1G, UN0420, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flares, aerial 1.1G UN0420 II Prohibited Prohibited

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

Flares, aerial — Postal shipping restrictions by item category


**Item category:** Flares, surface

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1G, UN0418, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flares, surface 1.1G UN0418 II Prohibited Prohibited

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

Flares, surface — Postal shipping restrictions by item category


**Item category:** Flash powder

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.3G, UN0305, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Flash powder 1.3G UN0305 II Prohibited Prohibited

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

Flash powder — Postal shipping restrictions by item category


**Item category:** Fluoroacetic acid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN2642, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fluoroacetic acid 6.1 UN2642 I Prohibited Prohibited

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

Fluoroacetic acid — Postal shipping restrictions by item category


**Item category:** Fluoroanilines

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 6.1, UN2941, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Fluoroanilines 6.1 UN2941 III 6A 6A

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

Fluoroanilines — Postal shipping restrictions by item category


**Item category:** Fluorobenzene

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2387, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Fluorobenzene 3 UN2387 II Prohibited 3A

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

Fluorobenzene — Postal shipping restrictions by item category


**Item category:** Fluoroboric acid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1775, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Fluoroboric acid 8 UN1775 II 8A 8A

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

Fluoroboric acid — Postal shipping restrictions by item category


**Item category:** Fluorophosphoric acid anhydrous

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN1776, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fluorophosphoric acid anhydrous 8 UN1776 II Prohibited Prohibited

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

Fluorophosphoric acid anhydrous — Postal shipping restrictions by item category


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

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 6.1, UN2856, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Fluorosilicates, n.o.s. 6.1 UN2856 III 6A 6A

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

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


**Item category:** Fluorosilicic acid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN1778, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fluorosilicic acid 8 UN1778 II Prohibited Prohibited

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

Fluorosilicic acid — Postal shipping restrictions by item category


**Item category:** Fluorosulfonic acid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN1777, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fluorosulfonic acid 8 UN1777 I Prohibited Prohibited

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

Fluorosulfonic acid — Postal shipping restrictions by item category


**Item category:** Fluorotoluenes

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2388, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Fluorotoluenes 3 UN2388 II Prohibited 3A

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

Fluorotoluenes — Postal shipping restrictions by item category


**Item category:** Foodstuffs and soaps in pressurized containers

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail

**Conditions:** Mailable if packaged in accordance with Packaging Instruction 2D

> Foodstuffs and Soaps: These items are mailable if packaged in accordance with Packaging Instruction 2D

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

Foodstuffs and soaps in pressurized containers — Postal shipping restrictions by item category

carrier, item_category, restriction_type, scope


**Item category:** Formaldehyde, solutions, flammable

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1198, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Formaldehyde, solutions, flammable 3 UN1198 III Prohibited 3A

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

Formaldehyde, solutions, flammable — Postal shipping restrictions by item category


**Item category:** Formaldehyde, solutions, with not less than 25 percent formaldehyde

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN2209, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Formaldehyde, solutions, with not less than 25 percent formaldehyde 8 UN2209 III 8A 8A

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

Formaldehyde, solutions, with not less than 25 percent formaldehyde — Postal shipping restrictions by item category


**Item category:** Formic acid with not less than 5 percent but less than 10 percent acid by mass

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN3412, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Formic acid with not less than 5 percent but less than 10 percent acid by mass 8 UN3412 III 8A 8A

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

Formic acid with not less than 5 percent but less than 10 percent acid by mass — Postal shipping restrictions by item category


**Item category:** Formic acid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1779, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Formic acid 8 UN1779 II 8A 8A

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

Formic acid — Postal shipping restrictions by item category


**Item category:** Fracturing devices, explosives, without detonators for oil wells

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0099, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fracturing devices, explosives, without detonators for oil wells 1.1D UN0099 II Prohibited Prohibited

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

Fracturing devices, explosives, without detonators for oil wells — Postal shipping restrictions by item category


**Item category:** Fuel, aviation, turbine engine

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1863, packing group I, II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Fuel, aviation, turbine engine 3 UN1863 I, II, III Prohibited 3A

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

Fuel, aviation, turbine engine — Postal shipping restrictions by item category


**Item category:** Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing water- reactive substances

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN3476, packing group not stated; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing water- reactive substances 4.3 UN3476 Prohibited Prohibited Prohibited

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

Fuel cell cartridges or Fuel cell cartridges contained in equipment or Fuel cell cartridges packed with equipment containing water- reactive substances — Postal shipping restrictions by item category


**Item category:** Fuel oil (NA1993)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation

**Conditions:** Mailable if qualifies as Limited Quantity surface material and meets quantity limitations and packaging requirements; Packaging Instruction 3A or 3B as applicable

> Fuel Oil (NA1993): A flammable liquid with a typical flashpoint below 100° F (38° C) is mailable if it qualifies as a Limited Quantity surface material

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

Fuel oil (NA1993) — Postal shipping restrictions by item category


**Item category:** Fuel oil (No. 1, 2, 4, 5, or 6)

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, NA1993, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Fuel oil (No. 1, 2, 4, 5, or 6) 3 NA1993 III Prohibited 3A

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

Fuel oil (No. 1, 2, 4, 5, or 6) — Postal shipping restrictions by item category


**Item category:** Fulminate of mercury (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.

> Fulminate of mercury (dry) Forbidden Prohibited Prohibited Prohibited Prohibited

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

Fulminate of mercury (dry) — Postal shipping restrictions by item category


**Item category:** Fulminating mercury

**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.

> Fulminating mercury Forbidden Prohibited Prohibited Prohibited Prohibited

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

Fulminating mercury — Postal shipping restrictions by item category


**Item category:** Fulminating platinum

**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.

> Fulminating platinum Forbidden Prohibited Prohibited Prohibited Prohibited

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

Fulminating platinum — Postal shipping restrictions by item category


**Item category:** Fulminating silver

**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.

> Fulminating silver Forbidden Prohibited Prohibited Prohibited Prohibited

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

Fulminating silver — Postal shipping restrictions by item category


**Item category:** Fulminic 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.

> Fulminic acid Forbidden Prohibited Prohibited Prohibited Prohibited

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

Fulminic acid — Postal shipping restrictions by item category


**Item category:** Fumaryl chloride

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1780, packing group II; domestic mail air: 8A; domestic mail surface: 8A

> Fumaryl chloride 8 UN1780 II 8A 8A

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

Fumaryl chloride — Postal shipping restrictions by item category


**Item category:** Fuming and spent sulfuric acids (UN1831, UN1832)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Nonmailable corrosive

> Fuming and Spent Sulfuric Acids (UN1831, UN1832).

Source: <https://pe.usps.com/text/pub52/pub52c3_027.htm>

Fuming and spent sulfuric acids (UN1831, UN1832) — Postal shipping restrictions by item category

carrier, conditions, restriction_type, scope


**Item category:** Furaldehydes

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1199, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Furaldehydes 6.1 UN1199 II Prohibited Prohibited

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

Furaldehydes — Postal shipping restrictions by item category


**Item category:** Furan

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN2389, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Furan 3 UN2389 I Prohibited Prohibited

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

Furan — Postal shipping restrictions by item category


**Item category:** Furfuryl alcohol

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 6.1, UN2874, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Furfuryl alcohol 6.1 UN2874 III 6A 6A

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

Furfuryl alcohol — Postal shipping restrictions by item category


**Item category:** Furfurylamine

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN2526, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Furfurylamine 3 UN2526 III Prohibited 3A

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

Furfurylamine — Postal shipping restrictions by item category


**Item category:** Fuse, igniter tubular metal clad

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.4G, UN0103, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuse, igniter tubular metal clad 1.4G UN0103 II Prohibited Prohibited

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

Fuse, igniter tubular metal clad — Postal shipping restrictions by item category


**Item category:** Fuse, non-detonating (instantaneous or quickmatch)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.3G, UN0101, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuse, non-detonating (instantaneous or quickmatch) 1.3G UN0101 II Prohibited Prohibited

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

Fuse, non-detonating (instantaneous or quickmatch) — Postal shipping restrictions by item category


**Item category:** Fuse, safety

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 1.4S, UN0105, packing group II; domestic mail air: Prohibited; domestic mail surface: 1B

> Fuse, safety 1.4S UN0105 II Prohibited 1B

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

Fuse, safety — Postal shipping restrictions by item category


**Item category:** Fusee (railway or highway)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, NA1325, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fusee (railway or highway) 4.1 NA1325 II Prohibited Prohibited

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

Fusee (railway or highway) — Postal shipping restrictions by item category


**Item category:** Fusel oil

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1201, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Fusel oil 3 UN1201 II, III Prohibited 3A

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

Fusel oil — Postal shipping restrictions by item category


**Item category:** Fuses (except safety fuses Division 1.4S)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** All types of fuses except permitted safety fuses are prohibited from mailing

> All types of fuses (except safety fuses as permitted under 341.22 ) are prohibited from mailing.

Source: <https://pe.usps.com/text/pub52/pub52c3_020.htm>

Fuses (except safety fuses Division 1.4S) — Postal shipping restrictions by item category


**Item category:** Fuzes, detonating, with protective features

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1D, UN0408, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuzes, detonating, with protective features 1.1D UN0408 II Prohibited Prohibited

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

Fuzes, detonating, with protective features — Postal shipping restrictions by item category


**Item category:** Fuzes, detonating

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.1B, UN0106, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuzes, detonating 1.1B UN0106 II Prohibited Prohibited

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

Fuzes, detonating — Postal shipping restrictions by item category


**Item category:** Fuzes, igniting

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.3G, UN0316, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Fuzes, igniting 1.3G UN0316 II Prohibited Prohibited

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

Fuzes, igniting — Postal shipping restrictions by item category


**Item category:** Galactsan trinitrate

**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.

> Galactsan trinitrate Forbidden Prohibited Prohibited Prohibited Prohibited

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

Galactsan trinitrate — Postal shipping restrictions by item category


**Item category:** Gallium

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN2803, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gallium 8 UN2803 III Prohibited Prohibited

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

Gallium — Postal shipping restrictions by item category


**Item category:** Gas cartridges (flammable) without a release device, non-refillable

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.1, UN2037, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

> Gas cartridges (flammable) without a release device, non-refillable 2.1 UN2037 n/a Prohibited 2A

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

Gas cartridges (flammable) without a release device, non-refillable — Postal shipping restrictions by item category


**Item category:** Gas identification set

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, NA9035, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas identification set 2.3 NA9035 n/a Prohibited Prohibited

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

Gas identification set — Postal shipping restrictions by item category


**Item category:** Gas oil or Diesel fuel or Heating oil, light

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1202, packing group III; domestic mail air: Prohibited; domestic mail surface: 3A

> Gas oil or Diesel fuel or Heating oil, light 3 UN1202 III Prohibited 3A

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

Gas oil or Diesel fuel or Heating oil, light — Postal shipping restrictions by item category


**Item category:** Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.1, UN3312, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid) 2.1 UN3312 n/a Prohibited Prohibited

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

Gas, refrigerated liquid, flammable, n.o.s. (cryogenic liquid) — Postal shipping restrictions by item category


**Item category:** Gas, refrigerated liquid, n.o.s. (cryogenic liquid)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.2, UN3158, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas, refrigerated liquid, n.o.s. (cryogenic liquid) 2.2 UN3158 n/a Prohibited Prohibited

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

Gas, refrigerated liquid, n.o.s. (cryogenic liquid) — Postal shipping restrictions by item category


**Item category:** Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.2, UN3311, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid) 2.2 UN3311 n/a Prohibited Prohibited

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

Gas, refrigerated liquid, oxidizing, n.o.s. (cryogenic liquid) — Postal shipping restrictions by item category


**Item category:** Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.1, UN3167, packing group n/a; domestic mail air: Prohibited; domestic mail surface: 2A

> Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquid 2.1 UN3167 n/a Prohibited 2A

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

Gas sample, non-pressurized, flammable, n.o.s., not refrigerated liquid — Postal shipping restrictions by item category


**Item category:** Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, UN3168, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquid 2.3 UN3168 n/a Prohibited Prohibited

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

Gas sample, non-pressurized, toxic, flammable, n.o.s., not refrigerated liquid — Postal shipping restrictions by item category


**Item category:** Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, UN3169, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquid 2.3 UN3169 n/a Prohibited Prohibited

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

Gas sample, non-pressurized, toxic, n.o.s., not refrigerated liquid — Postal shipping restrictions by item category


**Item category:** Gases (Hazard Class 2) — international mail

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** international mail

**Conditions:** All gases are prohibited from international mail

> International Mail: All gases are prohibited.

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

Gases (Hazard Class 2) — international mail — Postal shipping restrictions by item category


**Item category:** Gasohol gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, NA1203, packing group II; domestic mail air: Prohibited; domestic mail surface: 3A

> Gasohol gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol 3 NA1203 II Prohibited 3A

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

Gasohol gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol — Postal shipping restrictions by item category


**Item category:** Gasoline includes gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1203, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Gasoline includes gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol 3 UN1203 II Prohibited Prohibited

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

Gasoline includes gasoline mixed with ethyl alcohol, with not more than 10 percent alcohol — Postal shipping restrictions by item category


**Item category:** Gasoline (UN1203)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Gasoline is nonmailable under any circumstances

> 20° F (-7° C) or below are prohibited from mailing. Gasoline (UN1203) is a flammable liquid that normally has a flashpoint of -50° F. Gasoline is nonmailable under any circumstances. Acetone (UN1090) normally has a flashpoint of 0° F, Benzene (UN1114) normally has a flashpoint of 12° F, and Hexane(s) (UN1208) normally have flashpoints in

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

Gasoline (UN1203) — Postal shipping restrictions by item category


**Item category:** Gasoline

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** domestic

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

> hese 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 Publication 52, Hazar

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

Gasoline — Postal shipping restrictions by item category


**Item category:** Germane

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.3, UN2192, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Germane 2.3 UN2192 n/a Prohibited Prohibited

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

Germane — Postal shipping restrictions by item category