Foam systems are fire extinguisher systems, which in addition to water, use also a foaming agent.
This method is most needed and recommended when dealing with flammable liquids, for which water alone would not achieve the extinguishing effect required. The type and amount of foaming agent depends on the material to be protected. Generally the foaming agent can be added to water in a concentration of 1% to 6%
The foaming solution extinguishing effect essentially consists of three factors:
- The foam is lighter and spreads evenly over the surface of the flammable material, thus separating the oxygen supply.
- Gases formed by the flammable liquids are separated by the foam from the surrounding oxygen and cannot develop into flammable gaseous mixtures so there is no explosion hazard
- Water present in the mixture cools the flammable liquid.