IATA Class 4 Division 4.1

Flammable solids include solids that are readily combustible or that may cause or contribute to fire through friction. This division also includes self-reactive substances that are liable to undergo a strongly exothermic, or heat producing, reaction and desensitized explosives that can explode if not sufficiently diluted.

Readily combustible solids can be powdered, granular, or pasty. They can be easily ignited by brief contact with an ignition source, such as a burning match, and the flame can spread rapidly. In addition to the fire hazard, combustion byproducts can be toxic. Metal powders are particularly dangerous because fires from these powders are difficult to extinguish.

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