30 CFR § 57.4000
The following definitions apply in this subpart.
Liquids having a flash point at or above 100°F
(37.8 °C). They are divided into the following classes:
Class II liquids--those having flash points at or above 100 °F (37.8 °C) and below 140 °F (60 °C).
Class IIIA liquids--those having flash points at or above 140 °F (60 °C) and
below 200 °F (93.4 °C).
Class IIIB--liquids those having flash points at or above 200 °F (93.4 °C).
A designated passageway by which persons can leave an
The minimum temperature at which sufficient vapor is
released by a liquid to form a flammable vapor-air mixture near the surface
of the liquid.
A fan that controls the entire airflow of an underground
mine or the airflow of one of the major air circuits of the mine.
Any opening or entrance from the surface into an
A container of not over five gallons capacity that is
designed to safely relieve internal pressure when exposed to heat and has a
spring-closing lid and spout cover.