Heat-soaked tempered glass
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Heat Soaked Tempered Glass
Each basic glass contains extremely low quantities of nickel sulphide (NiS) crystals, which are inevitably introduced into the glass via the raw materials. In normal annealed float or patterned glass, these crystals do not have any relevance.
The extremely rapid cooling-off period during the tempering process “freezes” the NiS particles in a high temperature crystal modification. When heat is later applied, for example, through solar energy absorption, this crystal structure may change because the volume of the crystals change, i.e. increases, and this may cause the glass to suddenly burst apart as soon as the particles exceed a critical size.
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