The dry powder fire extinguisher is filled with ammonium phosphate dry powder fire extinguishing agent. Dry powder fire extinguishing agent is a dry and easily flowing fine powder used for fire extinguishing. It is composed of inorganic salt with fire extinguishing effect and a small amount of additives which are dried, crushed and mixed into fine solid powder. It is a fire extinguishing agent widely used in fire fighting, and is mainly used in fire extinguishers.

Dry powder fire extinguisher is a kind of fire extinguisher, which can be divided into: ① ordinary dry powder fire extinguisher; ② Ultra-fine dry powder fire extinguisher. The dry powder fire extinguisher is equipped with ammonium phosphate and other dry powder fire extinguishing agents. This dry powder fire extinguishing agent is easy to flow and dry. It is composed of inorganic salt and crushed dry additives, which can effectively put out the initial fire.