Zinc dithionite or Zinc hydrosulfite · USPS
What is the restriction type for Zinc dithionite or Zinc hydrosulfite · USPS?
For Zinc dithionite or Zinc hydrosulfite, carrier is USPS; restriction type is restricted; scope is domestic mail: surface only (air prohibited); conditions is Hazard class 9, UN1931, packing group III; domestic mail air: Prohibited; domestic mail surface: 9C, recorded from its source on 2026-08-10.
Zinc dithionite or Zinc hydrosulfite 9 UN1931 III Prohibited 9C
— pe.usps.com, retrieved 2026-08-10
- Item or substance
- Zinc dithionite or Zinc hydrosulfite verified
- Carrier
- USPS our reading
- Restriction type
- restricted our reading
- Scope
- domestic mail: surface only (air prohibited) our reading
- Conditions
- Hazard class 9, UN1931, packing group III; domestic mail air: Prohibited; domestic mail surface: 9C
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
Source
- pe.usps.comhttps://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf