Foam fire extinguisher
The fire-fighting function of foam fire extinguishers is mainly manifested in: the foam covering layer generated on the surface of the burning material isolates the surface of the burning material from the air and exerts the function of suffocating fire fighting. Because the foam layer can block the heat in the combustible area from functioning on the surface of the combustible material, it can prevent the combustible material itself and the surrounding combustible material from volatilizing. The water precipitated by the foam reduces the temperature of the surface of the combustion product, and the steam formed by the volatilization of the foam when heated can reduce the concentration of oxygen around the combustion product.
Fire fighting area of foam fire extinguisher: suitable for Class A fires, such as wood, cotton, linen, paper, etc., and can also extinguish general fires, such as petroleum products, grease, etc.; but cannot extinguish water-soluble flammable and flammable liquids Misfire, such as alcohol, ester, ether, ketone and other substances.
Dry powder fire extinguisher
The functions of dry powder fire extinguishers are mainly manifested in: one is to eliminate the active free ions formed by the burning material, so that the chain reaction of the burning material is interrupted; the other is that the dry powder absorbs a large amount of heat when it encounters high temperature decomposition, and releases water vapor and carbon dioxide to achieve cooling. And the function of diluting the oxygen in the air in the combustion area.
Fire fighting area of dry powder fire extinguisher: It is more suitable for extinguishing flammable liquid, gas, electrical fire and fire that is not suitable for extinguishing with water. AC dry powder fire extinguishers can extinguish fires caused by charged materials and burning materials of Class A, C, and D materials.
Carbon dioxide fire extinguisher
The fire-fighting function of carbon dioxide fire extinguishers is mainly manifested in: when the content of carbon dioxide in the combustion area reaches 30%-50%, the combustion can be extinguished, mainly as a suffocation function. At the same time, carbon dioxide is absorbed in the process of jet fire fighting. Corresponding heat, there will be a corresponding cooling function.
Carbon dioxide fire fighting area: It is more suitable for extinguishing fires of electrical equipment, precision instruments, books, archives and materials within 600 volts, and fires of oil, gas and some substances that cannot be extinguished with water in a small area.