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NOTE: This is an unformatted excerpt from our online fire protection training library.

Identifying Materials & Equipment

Liquids, Vapors & Gases

Types of Liquids

Generally, liquids are not ignitible. It is the vapors from liquids that are ignitible when mixed with air. Therefore, the temperature at which they will form an ignitible vapor-air mixture is important in categorizing ignitible liquids. Based on this temperature, which is called the Flash Point Definition: The minimum temperature at which a liquid gives off vapor in sufficient concentration to form an ignitible mixture with air near the surface of the liquid, as specified by test., liquids are classified as Flammable Liquids A liquid designated as Class I, having a flash point below 100°F (37.8°C) and having a vapor pressure not exceeding 40 psia at 100°F. or Combustible Liquids A liquid having a flash point at or above 100°F (37.8°C).. Liquids that form vapors that are not ignitible are neither flammable nor combustible, and liquids kept below their flash points will not form an ignitible mixture.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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