There are three degrees of tempering:

1. Tempered glass: Tempering degree=2~4N/cm, surface stress of tempered glass for glass curtain walls is α ≥ 95Mpa;

2. Semi tempered glass: Tempering degree=2N/cm, surface stress of glass curtain wall semi tempered glass is 24Mpa ≤ α ≤ 69Mpa;

3. Super tempered glass: Tempered degree>4N/cm.

Tempered glass is produced as a single piece, but can be further processed into multi-layer composite glass such as laminated glass and insulating glass Compared to composite glass, single piece tempered glass is directly used.

Tempered glass is classified as safety glass. Tempered glass is actually a type of prestressed glass. In order to improve the strength of glass, chemical or physical methods are usually used to create compressive stress on the surface of the glass. When the glass receives external force, the surface stress is first counteracted, and then the load-bearing capacity is improved, enhancing the glass's own resistance to wind pressure, heat and cold, impact, etc.

Glass is an amorphous inorganic non-metallic material, generally made from various inorganic mineral deposits (such as quartz sand, borax, boric acid, barite, barium carbonate, limestone, feldspar, soda ash, etc.) as the main material, with a few auxiliary materials added. Its main components are silicon dioxide and other oxides. The chemical composition of general glass is Na2SiO3, CaSiO3, SiO2 or Na2O · CaO · 6SiO2, etc. The main component is silicate complex salt, which is an amorphous solid with an irregular structure. Widely used in buildings for wind insulation and light transmission, classified as a mixture. There are also colored glasses that exhibit color by mixing oxides or salts of certain metals, as well as tempered glass made through physical or chemical methods. Sometimes we also refer to some transparent plastics (such as polymethyl methacrylate) as organic glass.

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