ABC dry chemical

Common card · No. 452064

Monoammonium phosphate, ABC dry chemical, ABC powder, tri-class, or multi-purpose dry chemical is a dry chemical extinguishing agent used on class A, class B, and electrical fires. It uses a specially fluidized and siliconized monoammonium phosphate powder. ABC dry chemical is usually a mix of monoammonium phosphate and ammonium sulfate, the former being the active component. The mix between the two agents is usually 40–60%, 60–40%, or 90–10% depending on local standards worldwide. The USGS uses a similar mixture, called Phos Chek G75F.

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