Mechanical Foam Fire Extinguisher (AFFF or AR-AFFF) has the ability to from an aqueous film, which quickly forms over water insoluble hydrocarbon fuel surfaces causing rapid fire extinguishment and vapour suppression for Class B fires. It also provides excellent penetrating and wetting qualities when used on class A fires. A – Burning Solids such as Paper, Wood , Fibers & Plastics etc B – Burning Liquid such as Oil Petrol Thinner, Kerosene etc.