Glass is non-crystalline inorganic non-metallic material, generally with a variety of inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda, etc.) as the main raw materials, in addition to add a small amount of auxiliary raw materials made.
It is mainly composed of silica and other oxides. The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O·CaO·6SiO2, etc. The main component is silicate compound salt, which is an amorphous solid with no regular structure.
Widely used in buildings, used to prevent wind and light, belong to the mixture. Colored glass mixed with oxides of certain metals or salts, tempered glass made by physical or chemical methods, etc. Some clear plastics, such as polymethyl methacrylate, are sometimes called plexiglass.