What industry does glass belong to

Glass production process mainly includes: ① raw material pre-processing. The massive raw materials (quartz sand, soda ash, limestone, feldspar, etc.) are crushed, the wet raw materials are dried, and the iron-containing raw materials are treated with iron removal to ensure the quality of the glass. ② Preparation of compound materials. ③ Melting system. The glass compound is heated at high temperature (1550~1600 degrees) in the pool kiln or crucible kiln to form a uniform, bubble-free liquid glass that meets the molding requirements. ④ Forming. Processing liquid glass into products of the required shape, such as plates, various utensils, etc. ⑤ Heat treatment. Through annealing, quenching and other processes, eliminate or produce the internal stress of the glass, phase separation or crystallization, and change the structural state of the glass.