Foam fire extinguishers are the ones which use the basic ingredient is the foam that squeezes out from the cylinder and forms a coating over the burning surface. The fire extinguisher is a safety device and thus should be present in all the households and even at workplaces. In the factories and in the industries that deal with toxic materials proper fire extinguishers are must. These devices help to control fire for time being till professional help is acquired. The foam fire extinguishers are filled with chemicals and as in they are squeezed out of the cylinder they form a foam to cover the burning surface.
The chemicals of the foam fire extinguishers is in the liquid form and stored in the cylinder, and the nozzle is such made that when the seal of the cylinder is broken the liquid oozes out in foam format to cool the surface. The foam fire extinguishers are very apt devices to control fire that involve oil and other petroleum products. The foam cools the burning surface and forms a thick layer over the surface and cuts the oxygen supply from the burning surface. The blanket formed by the foam helps to cut off the fire and control the fire.