Toughened glass is a kind of glass opposite to ordinary glass. In the process of glass production, it uses physical chemical methods to heat cool, then forms pressure stress on the surface of glass. When the glass is disturbed by external pressure, the external pressure on the surface of toughened glass counteracts, so as to improve the bending resistance strength of glass enhance its performance. After heat treatment, the glass is characterized by the formation of a compressive stress layer on the surface of the glass, the mechanical strength heat-resistant impact strength are improved, it has a special state of fragmentation. It is a kind of prestressed glass, which is processed on the basis of ordinary glass has high safety performance. Toughened glass has high resistance, 4-5 times of ordinary glass, 5 times of bending resistance more than 3 times of tensile strength. Toughened glass also has the characteristics of thermal stability, smoothness, transparency cutting. It is easy to be broken when encountering strong impact. Even if it is broken, it will be presented as scattered small particles without sharp angle, which greatly reduces the harm to human body, so it is also called safety glass.