Glass is an amorphous inorganic non-metallic material, generally made of a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main raw material, in addition to adding a small amount of auxiliary materials of. Its main components are silicon dioxide and other oxides.  The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2, or Na2O.CaO.6SiO2. The main component is a silicate double salt, which is an amorphous solid with a random structure. Widely used in buildings, used for wind and light transmission, belonging to a mixture. In addition, colored glass in which a color or a salt of a certain metal is mixed to develop a color, and tempered glass produced by a physical or chemical method, and the like are used. Sometimes some transparent plastics (such as polymethyl methacrylate) are also called organic glass.