Rectangle Tempered Glass is actually a kind of pre-stressed Glass, in order to improve the strength of Glass, usually using the chemical or physical method, in the Glass surface compressive stress, when the Glass is subjected to external force, the first offset surface stress, therefore, the bearing capacity is improved, and the wind resistance, cold and heat resistance, and impact resistance of the glass itself is enhanced. By craft, the Rectangle Tempered Glass can be divided into two categories.

1. Physics Rectangle Tempered Glassis also known as toughened glass. When ordinary flat glass is heated to a softening temperature close to that of glass in a heating furnace, the internal stress is eliminated through its own deformation, and then the glass is removed from the heating furnace, high-pressure cold air is then blown to both sides of the glass by a multi-nozzle, which cools rapidly and evenly to room temperature to produce a toughened glass. This kind of glass in the internal tension, external stress state, once local damage, there will be a stress release, glass was broken into countless small pieces, these small fragments without sharp edges and corners, not easy to hurt people.

2. Chemically Tempered Glass improves the strength of Glass by changing the chemical composition of the surface of the Glass, which is generally Tempered by ion exchange. The method is that silicate glasses containing alkali metal ions are immersed in molten lithium salts, and Na + or K + ions in the glass surface are exchanged with Li + ions, and Li + ion exchange layer is formed on the glass surface because the expansion coefficient of Li + is less than Na + and K + ions, the outer layer shrinks less and the inner layer shrink more during the cooling process, when the outer layer is compressed, the effect is similar to that of a physical toughened glass.

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