Combustible liquids means liquids having a flash point at or above 100 F (37.8 C). They are divided into the following classes:
(1) Class II liquids - those having flash points at or above 100 °F (37.8 °C) and below 140 °F (60 °C).
(2) Class IIIA liquids - those having flash points at or above 140 °F (60 °C) and below 200 °F (93.4 °C).
(3) Class IIIB liquids - those having flash points at or above 200 °F (93.4 °C).
30 CFR § 56.2
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: