---
type: restriction
id: usps-acetic-acid-un2790
asset: shipping-restrictions-by-class
title: "Acetic acid (UN2790) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_027.htm
source_quote: "Acetic Acid (UN2790): May be mailable if they meet Limited Quantity requirements for air or surface material, contains less than 80 percent acid, and does not exceed 1 pint."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Acetic acid (UN2790)"
carrier: "USPS"
restriction_type: "restricted"
scope: "domestic mail via air or surface transportation"
conditions: "Mailable if meets Limited Quantity requirements, contains less than 80% acid, and does not exceed 1 pint; Packaging Instruction 8A must be followed"
verified: true
unverified_fields: conditions
---
**Item category:** Acetic acid (UN2790)

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via air or surface transportation

**Conditions:** Mailable if meets Limited Quantity requirements, contains less than 80% acid, and does not exceed 1 pint; Packaging Instruction 8A must be followed

> Acetic Acid (UN2790): May be mailable if they meet Limited Quantity requirements for air or surface material, contains less than 80 percent acid, and does not exceed 1 pint.

Source: <https://pe.usps.com/text/pub52/pub52c3_027.htm>