Bending strength of tempered glass is 4 to 5 times the thickness of an ordinary sheet glass with. The thickness of 5mm tempered glass, bending strength and can be reached 152MPa. Stress distribution of glass in the thickness direction of the parabola, 8mm tempered glass, the surface compressive stress, Dongying glass, inner tensile stress. When the glass is subjected to mechanical force, mechanical force is converted to stress, the stress is superimposed with the original glass, causing stress migration, stress tensile stress line to compressive stress layer of glass movement, steel formed partly offset machinery tensile stress caused by external forces. While a glass surface compressive stress increases, but because the compressive strength of glass is much larger than the tensile strength, and thus will not break the glass. Development of glass can be traced back to the mid-17th century, initially, there was a king named Robert Rhine son, has done an interesting experiment, he put a drop of molten glass was placed in cold water, 12mm tempered glass, the results of the system It has become a very hard glass. This particulate glass high intensity like drop, dragging with long curved tail, known as the "Prince Robert pellets." But when the pellets are subjected to bending and breaking the tail when it is strange that the whole arabica therefore sudden severe crash, or even become a fine powder. The above approach, much like the metal quenching, which is glass quenching. This hardening does not make any change in composition of the glass, so it is also called physical hardening (physical tempered), therefore called tempered glass tempered glass, also known as tempered glass. Glass plates, glass Yaohui preferred (online consultation), Dongying glass by Glass Co., Ltd. Jinan Yaohui. Jinan Yaohui Glass Co., Ltd. (www.jyhhc.com/) Shandong Jinan, architectural glass leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Yaohui glass in Jinan leadership with the staff warmly welcome all inquiries negotiations to create the Jinan Yaohui glass better future.