The properties of an aerosol, gas, liquid, or solid material to ignite and burn. See below:
Aerosol, flammable
An aerosol that, when tested by the method described in 16 CFR 1500.45, Method for
Determining Extremely Flammable and Flammable Contents of Self-Pressurized Containers,
yields a flame projection exceeding 18 inches (45 cm) at full valve opening, or a flashback (a
flame extending back to the valve) at any degree of valve opening.
Gas, flammable
A gas that, at ambient temperature and pressure, forms a flammable mixture with air at a
concentration of 13 percent by volume or less, or forms a range of flammable mixtures with air
wider than 12 percent by volume, regardless of the lower limit.
Liquid, flammable
A liquid having a flashpoint below 100°F (37.8°C), except any mixture having components with
flashpoints of 100°F (37.8°C) or higher, the total of which make up 99 percent or more of the
total volume of the mixture.
Solid, flammable
A solid material, other than a blasting agent or explosive, that is liable to cause fire through
friction, absorption of moisture, spontaneous chemical change, or retained heat from
manufacturing or processing, or that can be ignited readily and when ignited burns so vigorously
and persistently as to create a serious hazard.

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