--- type: restriction id: usps-flammable-liquids-with-flashpoint-at-or-below-20-f-domestic-surface asset: shipping-restrictions-by-class title: "Flammable liquids with flashpoint at or below 20 F — domestic surface — Postal shipping restrictions by item category" sources: - https://pe.usps.com/text/pub52/pub52c3_022.htm source_quote: "Domestic Mail via Surface Transportation: Flammable liquids with a flashpoint at or below 20° F (-7° C) are prohibited." generated: true harvested: 2026-08-04 stale_after: 2027-08-04 item_category: "Flammable liquids with flashpoint at or below 20 F — domestic surface" carrier: "USPS" restriction_type: "prohibited" scope: "domestic mail via surface transportation" conditions: "Flammable liquids with a flashpoint at or below 20 F (-7 C) are prohibited from domestic surface mail" verified: false unverified_fields: item_category --- **Item category:** Flammable liquids with flashpoint at or below 20 F — domestic surface **Carrier:** USPS **Restriction type:** prohibited **Scope:** domestic mail via surface transportation **Conditions:** Flammable liquids with a flashpoint at or below 20 F (-7 C) are prohibited from domestic surface mail > Domestic Mail via Surface Transportation: Flammable liquids with a flashpoint at or below 20° F (-7° C) are prohibited. Source: