IATA Class 3 Definitions

Flash point is defined as the lowest temperature at which flammable vapor is given off a liquid in a test vessel in a sufficient concentration to be ignited in air when exposed momentarily to a source of ignition. The flash point of flammable and combustible liquids may be altered by the presence of an impurity. Generally, the flash point is quoted for a chemically pure substance.

A spontaneous ignition temperature is the lowest temperature at which a substance will ignite spontaneously without an external source of ignition.

The boiling point of a substance is the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid, causing the liquid to change into vapor.

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