In the 1930s, the French company Saint-Gobain and US companies Teli Pulekesi glass 3c, and the United Kingdom Pilkington automotive production and supply companies are beginning to make large flat glass windshield with. Japan in the 1930s have also been tempered glass for industrial production. Since the world began the era of mass production of tempered glass. 1970 4mm tempered glass, Triplex British steel company with a liquid medium thickness of 0.75 ~ 1.5mm glass to be successful, ending the history of physical steel 8mm tempered glass can not be tempered thin glass, which is a glass technology a major breakthrough. Tempered glass with high impact strength (4-5 times higher than ordinary plate glass), flexural strength (5 times higher than ordinary plate glass), good thermal stability and smooth, transparent, can be cut and so on. In the case of super-impact damage, the debris was scattered small granular, free of sharp edges, so called safety glass. Tempered glass according to the shape into flat glass and curved glass. 4,5,6,8,10,12,15,19mm eight kinds of flat glass thickness; curved glass thickness 5,6,8mm three. Tempered glass into their appearance quality: superior products, quality products categories. Tempered by debris state is divided into: Class I, Ⅱ and Ⅲ class.