Q&A

What Is Combustible Dust?

Source: Nilfisk Industrial Vacuums

At present there is no universal definition for combustible dust. The OSHA NEP defines it as “particulate solid that presents a fire or deflagration hazard when suspended in air or some other oxidizing medium over a range of concentrations, regardless of particle size or shape.”

The NFPA defines it as “any finely divided solid material that is 420 microns or smaller in diameter that presents a fire or explosion hazard when dispersed and ignited in air.”

Most solid organic materials, as well as many metals and some non-metallic inorganic materials, will burn or explode if finely divided and dispersed in sufficient concentrations.

Five basic elements are needed for an explosion:

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