Potassium peroxide
What is the carrier for Potassium peroxide?
For Potassium peroxide, carrier is USPS; restriction type is prohibited; scope is all mail; conditions is Nonmailable Division 5.1 oxidizing substance, recorded from its source on 2026-08-04.
Potassium peroxide.
— pe.usps.com, retrieved 2026-08-04
- Item category
- Potassium peroxide verified
- Carrier
- USPS our reading
- Restriction type
- prohibited our reading
- Scope
- all mail our reading
- Conditions
- Nonmailable Division 5.1 oxidizing substance
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.
The source states this two ways
The same publisher states this differently in more than one place. Each version is reproduced with the page it came from — deciding between them is yours, not ours.
Scope
pe.usps.com says scope is all mail, as of 2026-08-04.
Potassium peroxide.
https://pe.usps.com/text/pub52/pub52c3_024.htm
pe.usps.com says scope is domestic mail (air and surface), as of 2026-08-10.
Potassium peroxide 5.1 UN1491 I Prohibited Prohibited
https://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf
Conditions
pe.usps.com says conditions is Nonmailable Division 5.1 oxidizing substance, as of 2026-08-04.
Potassium peroxide.
https://pe.usps.com/text/pub52/pub52c3_024.htm
pe.usps.com says conditions is Hazard class 5.1, UN1491, packing group I; domestic mail air: Prohibited; domestic mail surface: Prohibited, as of 2026-08-10.
Potassium peroxide 5.1 UN1491 I Prohibited Prohibited
Sources
- pe.usps.comhttps://pe.usps.com/text/pub52/pub52c3_024.htm
- pe.usps.comhttps://pe.usps.com/cpim/ftp/pubs/pub52/pub52.pdf