The synthesis of special high-temperature resistant materials determines that the fire sleeve has many characteristics that are hard to be replaced by other similar materials: high-temperature resistance, heat preservation and insulation performance, flame-retardant performance, electrical insulation performance, chemical stability performance, weather aging resistance, cold resistance, water resistance, oil resistance, odor resistance, voltage resistance, arc resistance, corona resistance, etc., especially the safety and environmental protection performance, asbestos, etc The best alternative to hazardous products.