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About Safety Glass

Heat Strengthened Glass

Overview of Heat Strengthened Glass

Heat strengthened glass is similar to tempered glass except that the cooling is done at a much slower pace. Annealed glass is heated to approximately 650-700 ยบ C, but the cooling process is slower than that for tempered glass. Heat strengthened glass is about twice as strong as annealed glass of the same size and thickness. Heat strengthened glass is a semi tempered glass which retains the normal properties of ordinary float glass. Heat Strengthened glass has been strengthened thermally by inducing a surface compression of 6000 to 9000 psi as compared to a range of 11000 to 20000 psi in case of fully tempered glass. Heat strengthening adds strength to the glass while limiting the change in its breakage characteristics. The cooling process places the surfaces of the glass in a state of high compression and the central core in a state of compensating tension.
Characteristics of Heat Strengthened Glass

Heat-strengthened glass provides necessary resistance to thermal stress associated with high performance glazing materials such as tinted glass, reflective glass and Low-E glass. It also provides necessary resistance to heat building up when using spandrels glass.

When producing Heat strengthened laminated glass as compared to Tempered Laminated glass, Heat-strengthened glass allows the interlayer to laminated glass to adhere more evenly because of a flatter finish surface.

Heat-strengthened glass with its flatter surface also results in the facade having less optical distortions. With the exception of strength and breakage characteristic, heat-strengthened glass retains the normal properties of annealed glass including chemical resistance, hardness, expansion and deflection. This glass is difficult to break compared to ordinary annealed glass but unlike toughened safety glass it breaks typically edge to edge and fragments.