# All flammable liquids with flashpoint of 20 F (-7 C) or below — Postal shipping restrictions by item category

For All flammable liquids with flashpoint of 20 F (-7 C) or below, carrier is USPS; restriction type is prohibited; scope is all mail; conditions is All flammable liquids with flashpoint at or below 20 F are prohibited from mailing, recorded from its source on 2026-08-04.

- **Item category:** All flammable liquids with flashpoint of 20 F (-7 C) or below
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** All flammable liquids with flashpoint at or below 20 F are prohibited from mailing

## What the source says

> All flammable liquids having a flashpoint of 20° F (-7° C) or below are prohibited from mailing.

## Source

- https://pe.usps.com/text/pub52/pub52c3_022.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/).