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.

The total specific surface area of quantitative dry powder is small, the mass of single particle is large, the sedimentation rate is fast, and the decomposition rate is slow when heated, resulting in its low ability to capture free radicals, so the fire extinguishing ability is limited, which limits the use range of dry powder fire extinguishing agent to a certain extent. The particle size of dry powder fire extinguishing agent is directly related to its fire extinguishing efficiency. The larger the critical particle size of the fire extinguishing component, the better the fire extinguishing effect. Therefore, it is an effective way to improve the fire extinguishing efficiency of dry powder fire extinguishing agent to prepare ultrafine fire extinguishing powder that can be uniformly dispersed and suspended in the fire space, ensure the activity of fire extinguishing component particles, and reduce the amount of fire extinguishing agent used per unit space.