Silicon powder, amorphous · USPS
What is the restriction type for Silicon powder, amorphous · USPS?
For Silicon powder, amorphous, carrier is USPS; restriction type is prohibited; scope is domestic mail (air and surface); conditions is Hazard class 4.1, UN1346, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited, recorded from its source on 2026-08-10.
Silicon powder, amorphous 4.1 UN1346 III Prohibited Prohibited
— pe.usps.com, retrieved 2026-08-10
- Item or substance
- Silicon powder, amorphous verified
- Carrier
- USPS our reading
- Restriction type
- prohibited our reading
- Scope
- domestic mail (air and surface) our reading
- Conditions
- Hazard class 4.1, UN1346, packing group III; domestic mail air: Prohibited; domestic mail surface: Prohibited
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