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

Identifying Materials & Equipment

Combustible Dusts

Definitions

Combustible Dust: Any finely divided solid material 420 microns A micron is one millionth of a meter, so 420 microns is 0.42 mm. or less in diameter (i.e., material passing through a U.S. No. 40 Standard Sieve) that presents a fire or explosion hazard when dispersed and ignited in air.

Some dusts that are ignitible do not present much risk of explosion. The US Bureau of Mines has defined measures of explosion severity A measure of the damage potential of the energy released by a dust explosion. and ignition sensitivity A measure of the ease by which a cloud of combustible dust could be ignited. and dusts that fall below the thresholds established are not listed in tables of combustible dusts.

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

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