Disadvantage of tempered glass: 1 glass and steel can not be carried out after the cutting, and machining, it can only be tempered before the glass is processed to the desired shape, and then the steel processing. 2 tempered strength, although stronger than ordinary glass, but the glass in the temperature changes when there is a possibility blew (his own rupture), while ordinary glass blew possibility does not exist. 3 tempered glass surface there will be uneven phenomenon, a slight thinner. Thinning because after glass melt soften, after strong wind it rapidly cooled so that the internal crystal glass smaller gap, the pressure becomes large, steel and glass in the front than in thinner steel. Under normal circumstances 4-6MM tempered glass after thinning 0.2-0.8MM, 8-20MM toughened glass after thinning 0.9-1.8MM. To determine the specific level according to the device, which is also the reason mirror glass can not be done. The distribution of stresses in glass two tempered glass surface compressive stress, tensile stress in the core plate, the glass thickness of the stress distribution is similar to a parabola. Central Glass thickness is vertex of the parabola, the tensile stress is greatest; both sides close to the glass surface compressive stress; zero stress surface at about the 1/3 thickness. By analyzing the physical processes steel quenching, we can see the inside glass surface tension and the maximum tensile stress has roughly proportional to the value that tensile stress is compressive stress of 1 / 2-1 / 3. Domestic manufacturers generally tempered glass surface tension will be set at about 100MPa glass 3c, the reality may be higher. Toughened its tensile stress is about 32MPa ~ 46MPa, the tensile strength of glass is 59MPa ~ 62MPa glass window, as long as the tension generated by the expansion of nickel sulfide in 30MPa 4mm tempered glass is enough to trigger a self-destruct. If it reduces the surface stress, and accordingly will reduce the glass their own tensile stress, thus helping to reduce the incidence blew. American Standard ASTMC1048 range specified in the tempered glass surface stress greater than 69MPa; semi-tempered (thermally enhanced) glass is 24MPa ~ 52MPa. Standard BG17841 glass curtain wall is defined as half the steel stress range 24 <; δ≤69MPa. The new national standard GB15763.2-2005 implementation of China's "architectural safety glass - Part 2: glass" which the surface stress of not less than 90MPa. This is better than the old standard set forth in the 95MPa reduced 5MPa, it helps to reduce blew. Weifang glass, 4s glass, Yaohui trusted (certified merchants) are provided by Jinan Glass Co., Ltd. Yaohui. Jinan Yaohui Glass Co., Ltd. (www.jyhhc.com/) is specialized in "insulating glass, tempered glass, laminated glass, LOW-E glass" of the enterprise, the company adhering to the "honesty, hard service" concept, for you provide the highest quality products and services. Welcome to inquire! Contact: Liang Jingli.