# Flammable liquids with flashpoint at or below 20 F — domestic surface — Postal shipping restrictions by item category

For Flammable liquids with flashpoint at or below 20 F, item category is Flammable liquids with flashpoint at or below 20 F — domestic surface; carrier is USPS; restriction type is prohibited; scope is domestic mail via surface transportation; conditions is Flammable liquids with a flashpoint at or below 20 F (-7 C) are prohibited from domestic surface mail, recorded from its source on 2026-08-04.

- **Item category:** Flammable liquids with flashpoint at or below 20 F — domestic surface _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** domestic mail via surface transportation _(our reading, not quoted from the source)_
- **Conditions:** Flammable liquids with a flashpoint at or below 20 F (-7 C) are prohibited from domestic surface mail

## What the source says

> Domestic Mail via Surface Transportation: Flammable liquids with a flashpoint at or below 20° F (-7° C) are prohibited.

## 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/).