Question: what is the chemical in abc fire extinguishers

title: ABC dry chemical
text: Monoammonium phosphate , ABC Dry Chemical , ABE Powder , tri-class , or multi-purpose dry chemical is a dry chemical extinguishing agent used on class A , class B , and class C 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 one . 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 . 

Answer: answer: Monoammonium phosphate, ABC Dry Chemical, ABE Powder, tri-class, or multi-purpose dry chemical is a dry chemical extinguishing agent used on class A, class B, and class C fires.  ABC dry chemical is usually a mix of monoammonium phosphate and ammonium sulfate, the former being the active one.