Glass is an amorphous inorganic nonmetallic material, which is generally made of various inorganic minerals (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.). ) as the main raw material, and add a small amount of auxiliary raw materials.
Its main components are silicon dioxide and other oxides. [1] The chemical composition of ordinary glass is Na2SiO3, CaSiO3, SiO2 or Na2O CaO 6SiO2, and the main component is silicate double salt, which is an amorphous solid with irregular structure.
Widely used in buildings, used for wind and shading, belonging to a mixture. In addition, colored glass doped with oxides or salts of certain metals shows color, and tempered glass made by physical or chemical methods. Some transparent plastics (such as polymethyl methacrylate) are sometimes called plexiglass.
1. According to different kinds, glass has different characteristics. According to the classification method of architectural glass, the following are introduced respectively:
1) lens glass: good perspective and light transmittance (the visible light transmittance of 3mm and 5mm thick transparent glass is 87% and 84% respectively). The transmittance of near-infrared heat rays in sunlight is high, but it effectively blocks the far-infrared long-wave heat rays produced by the refraction of visible light on indoor walls and floors, furniture and fabrics, so it can produce obvious "greenhouse effect". The transmittance of clean glass to ultraviolet rays in sunlight is low;
2) Decorative glass: colored flat glass: it can be assembled into various balls and has the characteristics of corrosion resistance, erosion resistance and easy cleaning. Glazed glass has good chemical stability and decoration. Relief glass, spray glass, latex glass, carved glass and ice glass have various colors, impressions and luster effects according to their patterns, and are rich in decoration.
3) Safety glass: Tempered glass has high mechanical strength, good elasticity, good thermal stability, is not easy to hurt people after being broken, and can self-explode.
4) Energy-saving decorative glass. Colored glass: effectively absorb solar radiation heat to achieve the effect of heat insulation and energy saving; Absorb more visible light and soften transmitted light; Strong absorption of ultraviolet rays to prevent the indoor influence of ultraviolet rays; Bright colors and durability add to the beauty of the building.