What are the functions of fire foam extinguishing agents?

The foam sprayed by foam fire extinguishing agent is a bubble group, small in size, surrounded by liquid on the surface, and the specific gravity is less than the light flammable liquid, which can be covered on the surface of the liquid, mainly used to extinguish flammable liquid fires. Therefore, foam fire extinguishing is mainly to form a condensed foam floating layer on the surface of the liquid, which plays the role of suffocation and cooling, prevents fuel gasification and external oxygen from entering, and extinguishes the fire.

The role of foam fire extinguishing agents is:
1. The foam overlay formed by the fire extinguishing foam on the surface of the burning object can isolate the surface of the burning object from the air.

2. The foam layer can close the surface of the combustible, cut off the heat radiation of the flame to the combustible, prevent the evaporation or pyrolysis volatilization of the combustible, and prevent the combustible gas from entering the combustion area.

3. The precipitated foam liquid has a cooling effect on the temperature of the combustion surface.

4. The water vapor produced by the evaporation of the foam after being exposed to fire has the effect of diluting the oxygen concentration in the combustion zone.