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Tempered and heat-strengthened glass is obtained by heating ordinary glass to its softening point and then suddenly cooling down to form compression in the surface layer of the glass, thus the mechanical strength is increased by times. Features of tempered glass 1. Safety: when broken, tempered glass becomes small granules, which prevent substantial hurt to human body. 2. High strength: the strength of tempered glass is 4 to 5 times that of annealed glass. 3. Thermal stability: tempered glass has excellent thermal stability, which can withstand up to **0?C thermal shock. Tempered glass is a kind of safety glass and is widely used in places which call for high mechanical strength and safety, such as glazed door, curtain wall, vertical window, partition wall, and partition screen close to heat source and subject to violent thermal shock. Features of heat-strengthened glass Heat-strengthened glass differs from tempered glass in its surface compression; its mechanical strength is about 1.**2 times that of annealed glass. Heat-strengthened glass has outstanding thermal stability, and its flatness is close to that of annealed glass and better than that of tempered glass. Specifications Dimensions (mm): Maximum dimension: ***0mm x ***0mm Minimum dimension: **0mm x **0mm Thickness (mm): Tempered glass: 4mm – *2mm Heat-strengthened glass: 4mm **2mm Quality: Conforming to ASTM***8, the American standard conforming to BS***6, the British standard conforming to GB ****3.2, the Chinese standard Conforming to GB****1, the Chinese standard