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Tempered glass: Tempered glass is made of flat glass which is heated to just below its softening point and then suddenly chilled on the glass surfaces with jets of cold air; thus the compressive stress is distributed on the glass surface while the severe tensile stress is in the central layer. The compressive stress is strong and even, the severe tensile stress produced by outside press is countervailed by the strong compressive stress, so the safety
usgae of the glass is assured.