Produce porous plastic cover when the temperature carbonized layer, resistant to burning and to prevent further transfer heat to bring the body to reduce the internal strength of the role of tape. The carbonized layer in the operation of the process with the body to produce small irregular cracks, use with body cooling.Diameter structure of the inorganic material as reinforcing materials resistant to burning conveyor belt, the reinforcing materials used, to solve the cotton canvas used in high-temperature carbonization, nylon, polyester canvas, the difficulty of high-temperature shrinkage with high temperature strength loss, No shrinkage characteristics.Gum paste unique formula designed to ensure the rubber and the adhesion strength between the reinforcing material is much higher than normal heat-zone, and the high temperature bonding strength between layers ≥ 3N/mm.Materials to withstand temperature 200-600 ℃, the instantaneous 800 ℃.