Due to its large specific surface area and high activity, ultrafine fire extinguishing particles can be suspended in the air for several minutes to form relatively stable aerosols. Therefore, not only the fire extinguishing efficiency is very high, but also the use method is completely different from the general traditional dry powder fire extinguishing agent, which is similar to the haloalkane flooding fire extinguishing. For example, the extinguishing concentration of KHCO3 aerosol is only 2.0% of 1301 halogenated alkane, but its extinguishing efficiency is 50 times that of it, and the sediment after extinguishing is not obvious, causing little pollution to the fire site. KHCO3, NaCl, KCl, K2SO4, NH4H2PO4 and NaHCO3 can be used to prepare aerosol fire extinguishing agent. The particle size of aerosol fire extinguishing agent shall be less than<5 μ m. Better less than 0.5 μ m. Aerosol has become an independent new research field.

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.