The fire extinguishing agent is an effective substance that can destroy the combustion conditions and stop the combustion. Fire extinguishing agent manufacturers stated that because the performance of extinguishing agents is different, it is necessary to select the correct type of extinguishing agent and use it in different fire fighting battles to ensure that the fire is extinguished quickly.
Foam fire extinguishing agent is a fire extinguishing agent that produces foam by being miscible with water and using mechanical or chemical reactions. It is generally composed of chemical substances, hydrolyzed protein, or an aqueous solution of surfactants and other additives. The fire extinguishing mechanism of foam fire extinguishing agent is mainly cooling and suffocation, that is, a continuous foam layer is formed on the surface of the burning material on fire, the surface of the burning material is cooled by the foam itself and the precipitated mixture, and the foam layer is covered The role of combustion is to isolate the oxygen and extinguish the fire. The main disadvantages of foam fire extinguishing agents are water damage and pollution, and cannot be used to fight live fires.
Fire extinguishing agent manufacturers said that the main foam fire extinguishing agents are: protein foam fire extinguishing agent, fluorine protein foam fire extinguishing agent, light water foam fire extinguishing agent, alcohol-resistant foam fire extinguishing agent and high expansion foam fire extinguishing agent. Foam fire extinguishing agents are divided into three types according to the foaming ratio: those with a foaming ratio of less than 20 times are called low-expansion foam; those with a foaming ratio of 21 to 200 times are called medium-expansion foam; those with a foaming ratio between 201 and 1000 High expansion foam. According to the types and uses of foaming agents, low-expansion foam fire extinguishing agents can be divided into five types: ordinary protein foam, fluoroprotein foam, aqueous film-forming foam, synthetic foam and anti-solvent foam. Medium and high expansion foam fire extinguishing agents belong to the type of synthetic foam.
According to the mechanism of foam generation, foam fire extinguishing agents can be divided into chemical foam fire extinguishing agents and air foam fire extinguishing agents. Chemical foam is produced by a chemical reaction between the aqueous solutions of two medicaments, and the gas contained in the foam is carbon dioxide. Air foam is produced by mechanically mixing and stirring the aqueous solution of air foam fire extinguishing agent and air in the foam generator. Therefore, air foam is also called mechanical air foam. The gas contained in the foam is generally air.