Tempered glass is made of plate glass heated to nearly glass transition temperature,and cooled immediately and rapidly.Due to even compressive stress on toughened glass surface, and the corresponding tensile stress in inner layer,toughened galass is a sort of high strength safety glass.Bending strength and shock strength are four times higher than common glass.When toughened glass is broken,the debris is granular and safe.Therefore, toughened glass is the first choice sagety galss with wide application at present.
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