Tempered car windshield Glass

● Definition of Tempered Glass Tempered glass is produced by heating glass to a high temperature (at 650℃, becomes soft) and then quenched. This changes its molecular structure where compressive stress is formed on glass surface and tensile stress is formed at the core. The mechanical strength is increased by several times. ● Definition of Heat Strengthened Glass The production of heat strengthened glass is similar to that of tempered glass. It is heated to a temperature around 650℃ but is a little lower than that of tempered glass. Besides, the quenching speed is also slower. Its strength is lower than tempered glass but is about twice that of annealed glass. When broken. It will break into bigger pieces like annealed glass and it is not regarded as safety glass. The flexural strength of heat strengthened glass is smaller than tempered glass. But heat strengthened glass is more heat resistant than annealed glass.