Toughened glass broken glass due to the composition of impurities Nickel sulphide (Nis), though very small, but can not get rid of all, in my process is tempered glass, high temperature (about 6500C - 7000C) will making structure and volume of grain left in the glass Nis change. Rapid cooling process was not enough time necessary for Nis particles reach sustainable structures at low temperature before becoming hardened glass. Therefore, the elements of Nis county continues to change at different temperature levels inside the glass and the increase or decrease the volume of grain is a phenomenon caused Nis burst natural glass.
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