ABC dry chemical powder, 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 mono ammonium phosphate powder.
Uses
Common Combustible Solids---It insulates Class A fires by melting at approximately 180-200°C . Class A fires are caused by the burning of common combustible materials, such as wood, paper, or most plastics.
Burning Liquids and Gases---The powder breaks the chain reaction of liquid and gas fires by coating the surface to which it is applied. These fires including the burning of gasoline, oil, propane, and natural gas.
Electrical Fires---It is safe and effective for electrical fires since it is a non-conductor of electricity. Fires involving live electrical equipment need to be put out with equipment that will not conduct its energy back to the user as is the case with water. Electricity can also cause fires of the other classes.
Chimney Bombs---Chimney bombs are zip-lock bags or other small bags filled with ABC dry chemical powder. Chimney bombs are used by fire services personnel to help extinguish chimney fires.