Tempered glass is a type of glass with even compressive stress on the surface which is made by heating float glass to nearly softening point and then cooling it down rapidy by air.During the instant cooling process, the exterior of glass is solidified due to rapid cooling while the interior of glass is cooled down relatively slowly.This process will bring the glass surface compressive stress and the interior tensile stress which can improve the mechanical strength of glass by gemination and result in good thermal stability. advantage: 1. The anti-impacting performance and anti-bending performance are 3-5 times higher than ordinary glass. 2. It breaks into granules in case of strongly knocked, so no hurt would be caused. 3. deflection angle of tempered glass is 3-4 times larger than that of float glass of the same thickness. When there is load on tempered glass, its maximum tensile stress does not located on the glass surface as float glass, but on the central point of glass sheet.