The meaning of flame retardant: In the specified test conditions, the sample is burned, after the removal of the fire source, the spread of the flame on the sample only within a limited range and self-extinguishing characteristics, that is to prevent or delay the occurrence or spread of the flame ability. Fire-retardant cables The burning of wires, cables and cables is due to external heating resulting in the formation of flammable gases. To achieve the purpose of flame retardancy, the three elements that cause combustion must be suppressed: combustible gases, heat and oxygen. Therefore, the commonly used method for flame-retardant wire and cable is to add halogen-containing halides and metal oxides in materials such as insulation, sheathing, and filling. This is an excellent method to evaluate from the perspective of flame retardancy, however, Since these materials contain halides, they emit large amounts of fumes and hydrogen halide gases when they are burned. Therefore, visibility during fires is low, which greatly hampers the safe evacuation of people and fire protection, while people are more toxic. Gas suffocates to death.