A combustible dust is any material (finely chopped into small particles) which can spread in the air, ignite and initiate an explosion in the presence of an ignition source.
- Organic products (such as sugar, flour, grain, sawdust, etc.)
- with carbon-containing materials (charcoal, ash)
- textile fibres (cotton)
- most metals
- some non-metallic inorganic materials
Combustible dust can be presented:
Some of these materials are not normally flammable, but they can ignite or explode if the particles are the right size and the right concentration.
Thus any activity that creates dust must be investigated to determine the risk of this dust becoming combustible. Dust accumulates on surfaces such as rafters, roofs, suspended ceilings, ducts, crevices, dust collectors and other equipment. When dust rises under certain circumstances, there is the potential for a serious explosion. An accumulation of even small amounts of dust can cause serious damage.