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The classification of a material as a combustible liquid is strictly for transportation within the United States and is not recognized internationally.
Combustible liquid is defined in 173.120(b)(1) as “any liquid that does not meet the definition of any other hazard class specified in this subchapter [the Hazardous Materials Regulations], and that has a flashpoint above 60°C (140°F) and below 93°C (200°F).”
However, 173.120(b)(2) provides for Class 3 (flammable) materials with flashpoints at or above 38°C (100°F), and up to 60°C (140°F), that do not meet the definition of any other hazard class, to be reclassed as a “combustible liquid” for transportation by highway and rail.
Combustible liquids in non-bulk packaging which are not a hazardous substance, hazardous waste, or marine pollutant are not subject to the hazardous materials regulations (173.150(f)(2)).
Furthermore, combustible liquids in bulk packaging or combustible liquids that are a hazardous substance, hazardous waste, or marine pollutant are only subject to the hazmat regulations specified in 173.150(f)(3). This does not include labeling or security plans.
For shipments involving any air, water, or international movement, these materials are Class 3 (flammable) materials.
Also see the topics Identification numbers, Placarding, and Security plans.