Definition

Dry Powder Fire Extinguisher

A dry powder fire extinguisher discharges a fine chemical powder — typically mono-ammonium phosphate — to interrupt the combustion chain reaction. Effective on Class A, B, and C fires and live electrical equipment, it is identified by a blue label panel. Powder causes significant contamination and poor visibility, so its use in occupied buildings should be a last resort, per BS 5306-8.