What is Flammable Liquid and Combustible Liquid

Flammable Liquid: a liquid with a closed-cup flash point below 100°F (37.8°C) and a vapor pressure not exceeding 40 psig (2068 mm Hg) at 100"F (37.8°C). Class 1 liquids are subdivided as follows:
Class IA-those with flash points below 73°F (22.8°C) and a boiling point below 100°F (37.8°C)
Class IB-those with flash points below 73°F (22.8°C) and a boiling point at or above 100F (37.8"C
Class IC-those with flash points at or above 73°F (22.8°C) and below 100F (37.8°C)

Flash Point: the minimum temperature of a liquid at which sufficient vapor is given off to form an ignitable mixture with the air near the surface of the liquid or within the vessel used, as determined by the appropriate test procedure and apparatus.

Combustible Liquid: a liquid with a closed-cup flash point at or above 100"F (37.8C). (See also the definitions for flammable liquid and flash point.) Combustible liquids are subdivided as follows:
Class II Liquids - liquids with flash points at or above 100F (37.8°C) and below 140"F (60°C)
Class IIIA liquids - liquids with flash points at or above 140°F
(60°C) and below 200°F (93°C)
Class IlI B liquids - liquids with flash points at or above 200°F (93°C)


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