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A two-gallon container of methyl ethyl ketone (MEK) has a flash point of 16°F. What class of flammable liquid is MEK?

IA

IB

The classification of flammable liquids is determined by their flash points, which indicate the lowest temperature at which the vapor of a substance can ignite in air. Methyl ethyl ketone (MEK) is noted for having a flash point of 16°F, which places it within a specific category of flammable liquids.

For Class I flammable liquids, which includes those with flash points below 73°F, there are further distinctions: Class IA includes liquids with a flash point below 73°F and a boiling point below 100°F, while Class IB encompasses liquids with a flash point below 73°F but a boiling point at or above 100°F.

Given that MEK has a flash point of 16°F, it comfortably falls into Class IB, as it is flammable at lower temperatures but has a higher boiling point. Understanding this classification is important for proper handling, storage, and safety measures associated with flammable liquids in industrial and laboratory settings.

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II

III

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