**Item category:** Water-reactive solid, flammable, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN3132, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Water-reactive solid, flammable, n.o.s. 4.3 UN3132 I Prohibited Prohibited

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

Water-reactive solid, flammable, n.o.s. — Postal shipping restrictions by item category


**Item category:** Water-reactive solid, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN2813, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Water-reactive solid, n.o.s. 4.3 UN2813 I Prohibited Prohibited

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

Water-reactive solid, n.o.s. — Postal shipping restrictions by item category


**Item category:** Water-reactive solid, oxidizing, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN3133, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Water-reactive solid, oxidizing, n.o.s. 4.3 UN3133 II, III Prohibited Prohibited

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

Water-reactive solid, oxidizing, n.o.s. — Postal shipping restrictions by item category


**Item category:** Water-reactive solid, self-heating, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN3135, packing group I, II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Water-reactive solid, self-heating, n.o.s. 4.3 UN3135 I, II, III Prohibited Prohibited

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

Water-reactive solid, self-heating, n.o.s. — Postal shipping restrictions by item category


**Item category:** Water-reactive solid, toxic, n.o.s.

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN3134, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Water-reactive solid, toxic, n.o.s. 4.3 UN3134 I Prohibited Prohibited

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

Water-reactive solid, toxic, n.o.s. — Postal shipping restrictions by item category


**Item category:** Waxes and polishes (flammable or combustible liquid)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation

**Conditions:** Mailable if qualify as Limited Quantity surface materials and meet conditions; Packaging Instruction 3A or 3B as applicable

> Waxes and Polishes: Considered flammable or combustible liquids with varying flashpoints. It is mailable if they qualify as Limited Quantity surface materials

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

Waxes and polishes (flammable or combustible liquid) — Postal shipping restrictions by item category


**Item category:** White asbestos (chrysotile, actinolite, anthophyllite, tremolite)

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 9, UN2590, packing group III; domestic mail air: Prohibited; domestic mail surface: 9C

> White asbestos (chrysotile, actinolite, anthophyllite, tremolite) 9 UN2590 III Prohibited 9C

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

White asbestos (chrysotile, actinolite, anthophyllite, tremolite) — Postal shipping restrictions by item category


**Item category:** Wireless earbuds

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic US

**Conditions:** Requires hazmat declaration at label creation (Service Type Code), DOT Class 9 hazard label (lithium battery mark), and rigid outer packaging. Cannot be shipped via air modes without proper declaration. $50 noncompliance fee if undeclared, effective July 12, 2026.

> Wireless earbuds | Lithium battery (packed with equipment) | UN3481

Source: <https://selleressentials.com/usps-hazmat-noncompliance-fee-2026/>

Wireless earbuds — Postal shipping restrictions by item category


**Item category:** Wood preservatives, liquid

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 3, UN1306, packing group II, III; domestic mail air: Prohibited; domestic mail surface: 3A

> Wood preservatives, liquid 3 UN1306 II, III Prohibited 3A

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

Wood preservatives, liquid — Postal shipping restrictions by item category


**Item category:** Wool waste, wet

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN1387, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Wool waste, wet 4.2 UN1387 III Prohibited Prohibited

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

Wool waste, wet — Postal shipping restrictions by item category


**Item category:** Xanthates

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN3342, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xanthates 4.2 UN3342 II, III Prohibited Prohibited

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

Xanthates — Postal shipping restrictions by item category


**Item category:** Xenon, compressed

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 2.2, UN2036, packing group n/a; domestic mail air: 2B; domestic mail surface: 2B

> Xenon, compressed 2.2 UN2036 n/a 2B 2B

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

Xenon, compressed — Postal shipping restrictions by item category


**Item category:** Xenon, refrigerated liquid (cryogenic liquids)

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 2.2, UN2591, packing group n/a; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xenon, refrigerated liquid (cryogenic liquids) 2.2 UN2591 n/a Prohibited Prohibited

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

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


**Item category:** Xylenes

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1307, packing group II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylenes 3 UN1307 II, III Prohibited Prohibited

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

Xylenes — Postal shipping restrictions by item category


**Item category:** Xylenols, liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN3430, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylenols, liquid 6.1 UN3430 II Prohibited Prohibited

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

Xylenols, liquid — Postal shipping restrictions by item category


**Item category:** Xylenols, solid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN2261, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylenols, solid 6.1 UN2261 II Prohibited Prohibited

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

Xylenols, solid — Postal shipping restrictions by item category


**Item category:** Xylidines, liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1711, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylidines, liquid 6.1 UN1711 II Prohibited Prohibited

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

Xylidines, liquid — Postal shipping restrictions by item category


**Item category:** Xylidines, solid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN3452, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylidines, solid 6.1 UN3452 II Prohibited Prohibited

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

Xylidines, solid — Postal shipping restrictions by item category


**Item category:** Xylyl bromide, liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1701, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylyl bromide, liquid 6.1 UN1701 II Prohibited Prohibited

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

Xylyl bromide, liquid — Postal shipping restrictions by item category


**Item category:** Xylyl bromide, solid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN3417, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Xylyl bromide, solid 6.1 UN3417 II Prohibited Prohibited

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

Xylyl bromide, solid — Postal shipping restrictions by item category


**Item category:** Zinc ammonium nitrate

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Nonmailable Division 5.1 oxidizing substance

> Zinc ammonium nitrate.

Source: <https://pe.usps.com/text/pub52/pub52c3_024.htm>

Zinc ammonium nitrate — Postal shipping restrictions by item category

carrier, conditions, restriction_type, scope


**Item category:** Zinc ammonium nitrite

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 5.1, UN1512, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc ammonium nitrite 5.1 UN1512 II Prohibited Prohibited

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

Zinc ammonium nitrite — Postal shipping restrictions by item category


**Item category:** Zinc arsenate or Zinc arsenite or Zinc arsenate and zinc arsenite mixtures

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1712, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc arsenate or Zinc arsenite or Zinc arsenate and zinc arsenite mixtures 6.1 UN1712 II Prohibited Prohibited

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

Zinc arsenate or Zinc arsenite or Zinc arsenate and zinc arsenite mixtures — Postal shipping restrictions by item category


**Item category:** Zinc ashes

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.3, UN1435, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Zinc ashes 4.3 UN1435 III Prohibited 4A

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

Zinc ashes — Postal shipping restrictions by item category


**Item category:** Zinc bromate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN2469, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Zinc bromate 5.1 UN2469 III 5A 5A

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

Zinc bromate — Postal shipping restrictions by item category


**Item category:** Zinc chlorate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN1513, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Zinc chlorate 5.1 UN1513 II 5A 5A

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

Zinc chlorate — Postal shipping restrictions by item category


**Item category:** Zinc chloride, anhydrous

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 8, UN2331, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc chloride, anhydrous 8 UN2331 III Prohibited Prohibited

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

Zinc chloride, anhydrous — Postal shipping restrictions by item category


**Item category:** Zinc chloride, solution

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN1840, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Zinc chloride, solution 8 UN1840 III 8A 8A

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

Zinc chloride, solution — Postal shipping restrictions by item category


**Item category:** Zinc cyanide

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 6.1, UN1713, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc cyanide 6.1 UN1713 I Prohibited Prohibited

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

Zinc cyanide — Postal shipping restrictions by item category


**Item category:** Zinc dithionite or Zinc hydrosulfite

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 9, UN1931, packing group III; domestic mail air: Prohibited; domestic mail surface: 9C

> Zinc dithionite or Zinc hydrosulfite 9 UN1931 III Prohibited 9C

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

Zinc dithionite or Zinc hydrosulfite — Postal shipping restrictions by item category


**Item category:** Zinc fluorosilicate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 6.1, UN2855, packing group III; domestic mail air: 6A; domestic mail surface: 6A

> Zinc fluorosilicate 6.1 UN2855 III 6A 6A

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

Zinc fluorosilicate — Postal shipping restrictions by item category


**Item category:** Zinc nitrate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN1514, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Zinc nitrate 5.1 UN1514 II 5A 5A

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

Zinc nitrate — Postal shipping restrictions by item category


**Item category:** Zinc permanganate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN1515, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Zinc permanganate 5.1 UN1515 II 5A 5A

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

Zinc permanganate — Postal shipping restrictions by item category


**Item category:** Zinc peroxide

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN1516, packing group II; domestic mail air: 5A; domestic mail surface: 5A

> Zinc peroxide 5.1 UN1516 II 5A 5A

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

Zinc peroxide — Postal shipping restrictions by item category


**Item category:** Zinc phosphide

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN1714, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc phosphide 4.3 UN1714 I Prohibited Prohibited

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

Zinc phosphide — Postal shipping restrictions by item category


**Item category:** Zinc powder or Zinc dust

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.3, UN1436, packing group I, II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zinc powder or Zinc dust 4.3 UN1436 I, II, III Prohibited Prohibited

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

Zinc powder or Zinc dust — Postal shipping restrictions by item category


**Item category:** Zinc resinate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN2714, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Zinc resinate 4.1 UN2714 III Prohibited 4A

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

Zinc resinate — Postal shipping restrictions by item category


**Item category:** Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns)

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 4.1, UN2858, packing group III; domestic mail air: Prohibited; domestic mail surface: 4A

> Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns) 4.1 UN2858 III Prohibited 4A

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

Zirconium, dry, coiled wire, finished metal sheets, strip (thinner than 254 microns but not thinner than 18 microns) — Postal shipping restrictions by item category


**Item category:** Zirconium, dry, finished sheets, strip or coiled wire

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN2009, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium, dry, finished sheets, strip or coiled wire 4.2 UN2009 III Prohibited Prohibited

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

Zirconium, dry, finished sheets, strip or coiled wire — Postal shipping restrictions by item category


**Item category:** Zirconium hydride

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN1437, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium hydride 4.1 UN1437 II Prohibited Prohibited

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

Zirconium hydride — Postal shipping restrictions by item category


**Item category:** Zirconium nitrate

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 5.1, UN2728, packing group III; domestic mail air: 5A; domestic mail surface: 5A

> Zirconium nitrate 5.1 UN2728 III 5A 5A

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

Zirconium nitrate — Postal shipping restrictions by item category


**Item category:** Zirconium picramate, dry or wetted with less than 20 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 1.3C, UN0236, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium picramate, dry or wetted with less than 20 percent water, by mass 1.3C UN0236 II Prohibited Prohibited

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

Zirconium picramate, dry or wetted with less than 20 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Zirconium picramate, wetted with not less than 20 percent water, by mass

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN1517, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium picramate, wetted with not less than 20 percent water, by mass 4.1 UN1517 I Prohibited Prohibited

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

Zirconium picramate, wetted with not less than 20 percent water, by mass — Postal shipping restrictions by item category


**Item category:** Zirconium powder, dry

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN2008, packing group I, II, III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium powder, dry 4.2 UN2008 I, II, III Prohibited Prohibited

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

Zirconium powder, dry — Postal shipping restrictions by item category


**Item category:** Zirconium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.1, UN1358, packing group II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns 4.1 UN1358 II Prohibited Prohibited

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

Zirconium powder, wetted with not less than 25 percent water (a visible excess of water must be present) (a) mechanically produced, particle size less than 53 microns; (b) chemically produced, particle size less than 840 microns — Postal shipping restrictions by item category


**Item category:** Zirconium scrap

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 4.2, UN1932, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium scrap 4.2 UN1932 III Prohibited Prohibited

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

Zirconium scrap — Postal shipping restrictions by item category


**Item category:** Zirconium suspended in a liquid

**Carrier:** USPS

**Restriction type:** prohibited

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

**Conditions:** Hazard class 3, UN1308, packing group I, II; domestic mail air: Prohibited; domestic mail surface: Prohibited

> Zirconium suspended in a liquid 3 UN1308 I, II Prohibited Prohibited

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

Zirconium suspended in a liquid — Postal shipping restrictions by item category


**Item category:** Zirconium tetrachloride

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Hazard class 8, UN2503, packing group III; domestic mail air: 8A; domestic mail surface: 8A

> Zirconium tetrachloride 8 UN2503 III 8A 8A

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

Zirconium tetrachloride — Postal shipping restrictions by item category