Ceasefire’s ABC Powder Cartridge takes the guesswork and confusion out of firefighting. Being one of the most versatile extinguishing agents known to man, ABC Powder fights Class A, B, C and electrical fires with ease. When ABC Powder falls on a fire, the Mono Ammonium Phosphate in it expands and forms a thin layer on top of the surface. This controls the fire and stops re-ignition.