['Fire Protection and Prevention']

['Combustible Dusts']

02/04/2026

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Fire Protection and Prevention - Combustible Dusts
FAQ

FAQ

What size particles meet the definition of combustible dust?

RegSense Combustible Dusts Safety & Health General Industry Safety Best Results FAQ Fire Protection and Prevention English Focus Area USA

The National Fire Protection Association (NFPA) defines combustible dust as “any finely divided solid material that is 420 microns or smaller in diameter (material passing a U.S. No. 40 Standard Sieve) and presents a fire or explosion hazard when dispersed and ignited in air.”

['Fire Protection and Prevention']

['Combustible Dusts']

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