Tempered glass refers to glass whose molecular structures change greatly after heated at high temperature (at 650℃, it starts to become soft) and quenched and thus there appears even and strong pressure stress on glass surface as well as even and strong tensile stress inside, to multiple mechanical strength of glass.
The processing principle of heat strengthened glass is similar to that of tempered class. Its heating temperature is around 650℃, a little lower than that for tempered glass. Besides, its cooling speed is low just like that of tempered glass. The only difference between such glass and tempered glass is that: its strength is lower than that of tempered glass, about twice that of common glass. However, like annealed glass, its pieces (when broken) are large in size. Thus, it can not be used as safety glass. The bending of heat strengthened glass is smaller than that of tempered glass and the thermostability of heat strengthened glass is much better than that of annealed glass.

Tempered glass are safety glass. It is widely applied in places which have high requirements for mechanical strength and safety such as glass door, curtain wall for building, elevation windows, interior partition, furniture, as well as partitions close to sources of heat and places which are subject to severe thermal shock.  As heat strengthened glass does not explode by itself, it is widely used in glass curtain walls, greenhouses, partitions and decoration industry.

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