Flame extension involves spraying the aerosol in an open flame for 4 seconds. The length to which the flame is extended is observed and measured. The test is to indicate the effect of an aerosol formulation on the extension of an open flame.

Flash point is determined using the tag open-cup apparatus. The aerosol product is chilled to a temperature of –25°F and transferred to the test apparatus. The temperature of the test liquid is increased slowly and the temperature at which the vapors ignite is taken as the flash point. This test is used to determine the amount of the flammable component in the aerosol. The flash point obtained is usually the flash point of the most flammable component.