High-expansion foam fire extinguishing agent 6%, 3% (G) synthetic surfactant-based material, generator can emit 500 to 1000 times by high-expansion foam bubbles quickly filled the protected area and space through a lot of foam. Insulation required for combustion oxygen (air) and the implementation of fire. In addition there are high-expansion cooling and prevent fire in the heat transfer capabilities. Generally consists of a foaming agent, brilliant set, solvents, antifreeze, water softener, additives and other components. (1) Characteristics of high-expansion foam fire-extinguishing principle and aqueous solution by high-expansion foam fire extinguishing foam generator generated, its expansion ratio as high as 200 to 1000 times. Bubble diameter is generally at least 10mm. Because of its large volume expansion, coupled with the large amount of foam expansion foam generator (large 1000m3 can produce more foam in 1min), foam fire quickly filled the space, covering combustion, so that combustion and air separation ; foam produced after a lot of heat absorbing large amounts of water vapor, the temperature of the combustion zone abrupt decline, and diluted oxygen content in the air to stop the fire's heat conduction, convection and radiation, to prevent the fire from spreading. Therefore, high-expansion foam fire extinguishing technology with a small mixture supply strength, foam supply capacity, the fire quickly, safe and reliable, and less water loss after the fire scene and simple. (2) Applications Mainly suitable for fighting non-soluble flammable and flammable liquid fires and fires generally solid material (such as flowing from the tank to the fire within the fire or leaking dike from rotating machinery flammable liquid fires, etc.), and Fire warehouses, hangars, basements, underpasses, mines, ships and other limited space. LNG storage tanks and other cryogenic liquid when there is a leak high-expansion foam can also be applied to prevent vapor volatile and play the role of fire. Due to its small proportion, but also has good mobility, so in a bubble of gas flow through appropriate piping, can be delivered to a certain height or further afield to the fire. When the tank due to fire, tank over the updraft lift large, while the proportion of the bubble is very small and can not cover the oil surface, so you can not put out the fire with a high-expansion foam tank fire extinguishing agent: but for indoor storage of small amounts Water-soluble flammable liquid fires, and sometimes can also be used to put out the whole way drowned.