Aqueous film-forming foam fire extinguishing agent is also called light water foam fire extinguishing agent, abbreviated as AFFF in English. It is mainly composed of fluorocarbon surfactants, with foam stabilizers, preservatives, high molecular polymers and flame retardants added.
Fluorocarbon surfactants have the ability to significantly reduce surface tension, and have high heat resistance and chemical resistance properties. When used in combination with hydrocarbon surfactants, they exhibit a good synergistic effect, which can effectively reduce the surface tension of the solution. It can also reduce the surface expansion force.
The fire-extinguishing principle of aqueous film-forming foam fire extinguishing agent, in addition to the role of general foam fire extinguishing agent, when it disperses on the surface of the combustion fluid, it will precipitate liquid to cool the surface of the combustion fluid, and form a water film and foam on the combustion fluid surface. The layers jointly seal the surface of the fuel liquid, isolate the air, and form a heat insulation barrier. The liquid vaporized after absorbing heat dilutes the oxygen content of the air on the fuel liquid surface, which suffocates the burning liquid and prevents the temperature of the fuel liquid from rising and vaporizing. And burning intensity.