It is mainly used in the thermal process and coating process of solar cells. It has high density, high strength, high thermal conductivity, strong oxidation resistance, strong acid corrosion resistance and high temperature resistance. It will not deform even if it is used repeatedly in a working environment of 1300°C, which helps to improve the diffusion process and Product quality and manufacturing efficiency of oxidation annealing process, LPCVD process, and PECVD process..