Flammable liquid
Flammable liquid means a liquid that has a flash point below 100 F (37.8 C), a vapor pressure not exceeding 40 pounds per square inch at 100 F (37.8 C), and is known as a Class I liquid.
Source
30 CFR § 56.2
Scoping language
The following definitions apply in this part. In addition definitions contained in any subpart of part 56 apply in that subpart. If inconsistent with the general definitions in this section, the definition in the subpart will apply in that subpart: