--- type: restriction id: usps-intoxicating-liquors-denatured-flammable-or-combustible asset: shipping-restrictions-by-class title: "intoxicating liquors - denatured flammable or combustible — Postal shipping restrictions by item category" sources: - https://pe.usps.com/text/pub52/pub52c4_006.htm source_quote: "if denaturing agents are used, such as sodium bisulfate (a corrosive) or mercuric chloride (a poison), the substances must meet the mailability requirements for Class 8 corrosive material or a Division 6.1 toxic substance" generated: true harvested: 2026-08-04 stale_after: 2027-08-04 item_category: "intoxicating liquors - denatured flammable or combustible" carrier: "USPS" restriction_type: "restricted" scope: "domestic mail" conditions: "If denaturing agents such as sodium bisulfate (a corrosive) or mercuric chloride (a poison) are used, substance must meet mailability requirements for Class 8 corrosive or Division 6.1 toxic substance; flammable or combustible contents must meet Class 3 requirements" verified: false unverified_fields: carrier, conditions, item_category, scope --- **Item category:** intoxicating liquors - denatured flammable or combustible **Carrier:** USPS **Restriction type:** restricted **Scope:** domestic mail **Conditions:** If denaturing agents such as sodium bisulfate (a corrosive) or mercuric chloride (a poison) are used, substance must meet mailability requirements for Class 8 corrosive or Division 6.1 toxic substance; flammable or combustible contents must meet Class 3 requirements > if denaturing agents are used, such as sodium bisulfate (a corrosive) or mercuric chloride (a poison), the substances must meet the mailability requirements for Class 8 corrosive material or a Division 6.1 toxic substance Source: