Combustible Liquids (Hazard Class 3) · USPS
What is the restriction type for Combustible Liquids (Hazard Class 3) · USPS?
For Combustible Liquids (Hazard Class 3), carrier is USPS; restriction type is restricted; scope is Domestic Mail via Air Transportation (as ID8000) or Surface Transportation (as Limited Quantity); prohibited International; conditions is Via air, mailable if they qualify as ID8000 materials per 335 and meet criteria in Exhibit 343.22. Via surface, mailable if they qualify as Limited Quantity and consumer commodity materials per 343.22. Prohibited in international mail, recorded from its source on 2026-08-04.
343.22 Requirements for Combustible Liquids The following conditions apply for mailing combustible liquids: International Mail: Combustible liquids are prohibited. Domestic Mail via Air Transportation: Combustible liquids are mailable if they qualify as ID8000 materials (refer to 335) and meet the criteria in Exhibit 343.22. Packaging Instruction 3B in Appendix C must be followed. Domestic Mail via Surface Transportation: Combustible liquids are mailable if they qualify as Limited Quantity and consumer commodity materials and meet the criteria in Exhibit 343.22. Packaging Instruction 3B in Appendix C must be followed.
— pe.usps.com, retrieved 2026-08-04
- Item or substance
- Combustible Liquids (Hazard Class 3) verified
- Carrier
- USPS our reading
- Restriction type
- restricted our reading
- Scope
- Domestic Mail via Air Transportation (as ID8000) or Surface Transportation (as Limited Quantity); prohibited International our reading
- Conditions
- Via air, mailable if they qualify as ID8000 materials per 335 and meet criteria in Exhibit 343.22. Via surface, mailable if they qualify as Limited Quantity and consumer commodity materials per 343.22. Prohibited in international mail.
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
Where each value comes from
The value above is stated away from the sentence quoted with the answer, so the passage that states it is shown here too.
Item or substance
343 Flammable and Combustible Liquids (Hazard Class 3)
— all from pe.usps.com, retrieved 2026-08-04
Source
- pe.usps.comhttps://pe.usps.com/text/pub52/pub52c3_022.htm