# Ethanol-based flammable liquids or solids — Postal shipping restrictions by item category

For Ethanol-based flammable liquids or solids, carrier is USPS; restriction type is restricted; scope is domestic mail via air only; conditions is Mailable by domestic air only with prior written authorization from director, Product Classification; quantity and packaging limits apply based on ethanol concentration, recorded from its source on 2026-08-04.

- **Item category:** Ethanol-based flammable liquids or solids _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** domestic mail via air only _(our reading, not quoted from the source)_
- **Conditions:** Mailable by domestic air only with prior written authorization from director, Product Classification; quantity and packaging limits apply based on ethanol concentration _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Flammable liquids or solids containing ethanol (ethyl alcohol) are mailable by domestic air only with prior written authorization.

## 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/).