---
type: restriction
id: usps-flammable-liquids-with-flashpoint-above-20-f-domestic-surface
asset: shipping-restrictions-by-class
title: "Flammable liquids with flashpoint above 20 F — domestic surface — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_022.htm
source_quote: "Other flammable liquids may be mailed if they qualify as a Limited Quantity surface material and meet the criteria in Exhibit 343.21"
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Flammable liquids with flashpoint above 20 F — domestic surface"
carrier: "USPS"
restriction_type: "restricted"
scope: "domestic mail via surface transportation only"
conditions: "Mailable if qualifies as Limited Quantity surface material and meets criteria; must follow Packaging Instruction 3A"
verified: false
unverified_fields: carrier, conditions, item_category
---
**Item category:** Flammable liquids with flashpoint above 20 F — domestic surface

**Carrier:** USPS

**Restriction type:** restricted

**Scope:** domestic mail via surface transportation only

**Conditions:** Mailable if qualifies as Limited Quantity surface material and meets criteria; must follow Packaging Instruction 3A

> Other flammable liquids may be mailed if they qualify as a Limited Quantity surface material and meet the criteria in Exhibit 343.21

Source: <https://pe.usps.com/text/pub52/pub52c3_022.htm>