Scope of application: sodium bicarbonate dry powder fire extinguisher is suitable for the initial fire of flammable, combustible liquids, gases and charged equipment; Ammonium phosphate dry powder fire extinguisher can be used not only for the above kinds of fires, but also for the initial fire of solid substances. But they can't put out the fire of metal burning.

2. foam extinguisher

Scope of application: it is suitable for fighting general Class B fires, such as oil and grease fires, and can also be used for fighting Class A fires, but it cannot fight water-soluble flammable and combustible liquids, such as alcohols, esters, ethers, ketones and other substances in Class B fires; It is also impossible to put out live equipment and class C and D fires.