Quartz glass is a glass composed of a single oxide silica. The Si-O bond in silica is strong, and the covalent bond and the ionic bond are about half each. It is a typical network forming oxide. Quartz glass has superior physical and chemical properties: high purity, high mechanical strength, good chemical stability, wide spectral transmission, resistance to thermal shock, high temperature deformation, radiation and electrical insulation. China's quartz glass industry has a low concentration. It has a certain scale mainly distributed in North China (Beijing, Langfang), East China (Shanghai, Jiangsu, Zhejiang), Northeast (Liaoning), Central China (Hubei), etc. . The main enterprises include China Building Materials Science Research Institute, Beijing Jingrang Quartz Glass Co., Ltd., Jiuzhi Optoelectronic Material Technology Co., Ltd., Beijing Kaide Quartz Plastic Products Co., Ltd., Shanghai Qianghua Quartz Co., Ltd., Hubei Feilihua Quartz Glass. Co., Ltd., etc.