Essentially, any material “that will burn in air” in a solid form has the ability to catch fire and explode as a dust. Sources of combustible dust include most solid organic materials such as sugar, flour, grain, and wood; many metals; and some nonmetallic inorganic materials. The potential for a dust explosion depends on many factors, including as the dust particle’s size, shape, and moisture content. The build-up of even a small amount of dust on surfaces such as rafters, roofs, suspended ceilings, ducts, and window sills can cause serious damage if an explosion occurs. Any activity that creates dust should be investigated to determine if there is a risk that the dust is combustible.
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National Emphasis Program (NEP): Combustible Dust06/05/2015
Inferno: Dust Explosion at Imperial Sugar9:28 minutes