Aqueous Film Forming Foam AFFF Fire extinguishers are mainly water based with a synthetic Foam agent like hydrocarbon surfactants, so that the foam can float on the top of the burning liquid and break the interaction between the flames and the fuel surface by separating the oxygen element from the other elements. AFFF Fire extinguishers are the best choice for burning liquids and solids such as paint, ink, petrol, diesel, flammable chemicals but not suitable for electric fires. AFFF generated foams extinguish hydrocarbon flammable liquid fires the same way as the protein or fluoroprotein foams do, however an additional feature is an aqueous film is formed on the surface of the flammable liquid by the foam solution to make a blanket over the fire. For the price of Fire Extinguisher