Classification of wire and cable flame retardant properties

The combustion of wire and cable is due to external heating to produce combustion, and combustible gases to maintain combustion. To achieve the purpose of flame retardant, must inhibit the three elements that cause combustion: combustible materials, temperature, oxygen. Wire and cable on the flame retardant problem is generally used in the insulation, sheath, filler and other organic materials, adding halogen (F, C1, Br, etc.) containing halides and add metal oxides such as antimony trioxide, only from the point of view of the evaluation of flame retardant, which is a better method. However, it suffers from problems such as high smoke generation and the production of large amounts of halogen gases. The high smoke generation reduces visibility in case of a fire, causing a great hindrance to evacuation and firefighting, and the large amount of halogen gases tends to asphyxiate people, thus increasing to a certain extent the loss of people and property in case of a fire. In addition, halogen gases react with water in the air to generate hydrogen halide acid will also cause corrosion of equipment, and even erosion of concrete and other secondary damage. At present, the flame retardant cable has been further improved by the past halogen flame retardant to halogen-free flame retardant. Halogen-free flame retardant cable as the current direction of development of flame retardant cables.

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