Flammable solids (Hazard Class 4) — domestic air · USPS
What is the item or substance for Flammable solids (Hazard Class 4) — domestic air · USPS?
For Flammable solids (Hazard Class 4), carrier is USPS; item or substance is Flammable solids (Hazard Class 4) — domestic air; restriction type is prohibited; scope is domestic mail via air transportation; conditions is All flammable solids are prohibited from domestic air mail, recorded from its source on 2026-08-04.
Domestic Mail via Air Transportation: All flammable solids are prohibited.
— pe.usps.com, retrieved 2026-08-04
- Item or substance
- Flammable solids (Hazard Class 4) — domestic air
- Carrier
- USPS our reading
- Restriction type
- prohibited our reading
- Scope
- domestic mail via air transportation our reading
- Conditions
- All flammable solids are prohibited from domestic air mail
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/text/pub52/pub52c3_023.htm