---
type: restriction
id: usps-nitric-acid-un2031-un2032
asset: shipping-restrictions-by-class
title: "Nitric acid (UN2031, UN2032) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_027.htm
source_quote: "Nitric Acid (UN2031, UN2032)."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Nitric acid (UN2031, UN2032)"
carrier: "USPS"
restriction_type: "prohibited"
scope: "all mail"
conditions: "Nonmailable corrosive"
verified: true
unverified_fields: carrier, conditions, restriction_type, scope
---
**Item category:** Nitric acid (UN2031, UN2032)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Nonmailable corrosive

> Nitric Acid (UN2031, UN2032).

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