---
type: restriction
id: usps-hydrochloric-acid-un1789
asset: shipping-restrictions-by-class
title: "Hydrochloric acid (UN1789) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_027.htm
source_quote: "Hydrochloric Acid (UN1789): Acceptable only in solutions not exceeding 10 percent acid that qualify as Limited Quantity air or Limited Quantity surface material."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Hydrochloric acid (UN1789)"
carrier: "USPS"
restriction_type: "restricted"
scope: "domestic mail via air or surface transportation"
conditions: "Acceptable only in solutions not exceeding 10% acid that qualify as Limited Quantity air or surface; Packaging Instruction 8A must be followed"
verified: true
unverified_fields: carrier, conditions
---
**Item category:** Hydrochloric acid (UN1789)

**Carrier:** USPS

**Restriction type:** restricted

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

**Conditions:** Acceptable only in solutions not exceeding 10% acid that qualify as Limited Quantity air or surface; Packaging Instruction 8A must be followed

> Hydrochloric Acid (UN1789): Acceptable only in solutions not exceeding 10 percent acid that qualify as Limited Quantity air or Limited Quantity surface material.

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