The information of tempered glass

Strong or tempered glass is a type of safety glass has been processed by thermal or chemical treatment is to control compared with normal glass, increasing its strength. Tempering, rather than to differentiate into jagged pieces, to create a balanced internal stress may be the collapse of a small granular mass, causing the broken glass. Potential to cause damage granular mass is low.
As a result of its safety and strength, tempered glass, as a component of car windows and doors and tables, shower doors, architectural glass, tray refrigerator, bulletproof glass, etc. and a variety of diving mask, demanding different types of dishes and cooking utensils are used in applications. In the United States since 1977, federal law, has been required in the glass (46 cm) of 18 floors that are tempered and doorways.
Tempered glass is strong physically and thermally than normal glass. Large contraction of the inner layer induces a compressive stress on the surface of the glass balanced by tensile stress in the body of the glass at the time of manufacture. Glass is to be considered to be robust, this compressive stress must be the minimum value of 69 MPa on the surface of the glass. For it is considered to be safety glass, the surface compressive stress must be greater than 100 MPa. Stress will be greater than the surface when broken, and the glass particles is smaller.
It gives the strength increase of reinforced glass, this is a compressive stress. Any defects on the surface of, there is a possibility core layer starts to crack, because of the defects remains relatively free, tend to be pushed closed by the compression force retention.
That must be done prior to any cutting or grinding tempering. Grinding, cutting, sharp shock and scratches sometimes glass will cause it to fracture after tempering. Glass was solidified by dropping into the water known as shatter when the “tail” of them is broken “Drops of Prince Rupert” is, is an extreme example of the effects of tension inside the .
This can be observed by using a pair of polarizing sunglasses pattern of the strains obtained from tempering, or polarization.
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