# Cleaning agents and solvents (flammable liquid) — Postal shipping restrictions by item category

For Cleaning agents and solvents (flammable liquid), carrier is USPS; restriction type is restricted; scope is domestic mail via surface transportation; conditions is Mailable if qualifies as Limited Quantity surface material and meets conditions; Packaging Instruction 3A must be followed, recorded from its source on 2026-08-04.

- **Item category:** Cleaning agents and solvents (flammable liquid) _(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 surface transportation _(our reading, not quoted from the source)_
- **Conditions:** Mailable if qualifies as Limited Quantity surface material and meets conditions; Packaging Instruction 3A must be followed _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Cleaning Agents and Solvents: A flammable liquid. It is mailable if it qualifies as Limited Quantity surface materials and meet the conditions in 343.21 as applicable.

## 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/).