Class-A foam extinguishing agent for CAFS system LCF Class A foam concentrate is made by high activity hydrocarbon surfactants , solvents and stabilizers for use on class A fires and smaller class B fires. Class A foam concentrate does not contain toxicity and it is a environment friendly biodegradable foam concentrate. When applying for Class A fire, the concentrate will change water properties and reduces the surface tension of the water and produce foam so that to absorb heat and provide penetration into burning fuel. Class A foam concentrate provides excellent extinguishing of class A fires by providing deep penetration of the water into the burning material. At low concentrations it is also highly effective as a wetting agent. Class A foam concentrate is also effective on smaller class B fires. Class A foam concentrate can be used with both aspirating and non-aspirating discharge devices. It is compatible with all dry chemical powders.