ABC Dry Chemical

ABC Dry Chemical

ABC or Multi-Purpose dry chemical is a dry chemical extinguishing agent. It utilizes a specially fluidized and siliconized monoammonium phosphate powder. ABC dry chemical is usually a mix of monoammonium phosphate and ammonium sulphate, the former being the active one. The mix between the two agents is usually 40-60%, 60-40%, or 90-10%.


It insulates Class-A fires by melting at approximately 350-400 degrees F. The powder breaks the chain reaction of Class-B fires by coating the surface to which it is applied. It is safe and effective for Class-C fires since it is a non-conductor of electricity.

Sizes of these handheld fire extinguishers range in US customary sizes from 2 1/2lb., 5lb., 6lb., 10lb., 20lb. and "Fast Flow" and cartridge operated 30lb. extinguishers. Wheeled extinguishers used in high hazard areas range from 150lb. - 350lb. For stationary handline systems the capacities range from 500 lb. - 3000 lb. units. In EN 3 European standards, the range is 1 kg to 12 kg; wheeled models containing 30, 50, 75 and 100 kg are also used.

ABC dry chemical is inappropriate for chlorine or oxidizer fires. The resulting chemical reaction can cause an explosion or a breakdown of the chemicals releasing toxic gases. Water should be used. ABC dry chemical is inappropriate for certain metal fires (Class-D) as well as cooking oil fires (Class-K). Due to the corrosive properties of ABC Dry chemical, it is not recommended for use around aircraft or sensitive equipment.


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