Foam Extinguishers has the ability to form an aqueous film which quickly over water-insoluble hydrocarbon fuel surfaces causing rapid fire extinguishment and vapour suppression for class b fires. Also, it provides excellent penetrating and wetting qualities when used on class A fires. Hence, Foam Extinguishers are ideal for fires involving volatile liquids and freely burning materials such as the lubricant, oil fires, cloth, wood, etc.