# Oxidizing substances and organic peroxides (Hazard Class 5) — international mail — Postal shipping restrictions by item category

For Oxidizing substances and organic peroxides (Hazard Class 5), item category is Oxidizing substances and organic peroxides (Hazard Class 5) — international mail; carrier is USPS; restriction type is prohibited; scope is international mail; conditions is All oxidizing substances and organic peroxides are prohibited from international mail, recorded from its source on 2026-08-04.

- **Item category:** Oxidizing substances and organic peroxides (Hazard Class 5) — international mail
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** international mail _(our reading, not quoted from the source)_
- **Conditions:** All oxidizing substances and organic peroxides are prohibited from international mail

## What the source says

> International Mail: All oxidizing substances and organic peroxides are prohibited.

## Source

- https://pe.usps.com/text/pub52/pub52c3_024.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).