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why should tempered glass being heat soak test
Jul 20, 2017

   Cause there is nickel sulfide(Nis) in tempered glass.Under strictly controlled temperatures,high-temperature a-nis converts to low-temperature b-Nis which accompanies a 2-4% expansion in volume and cuase the glass to break if the inclusion is located at a tensile stress.The test reduces the frequency of spontaneous breakage of tempered glass after installation.    

   Tempered glass is heat soaked for 2-8 hours(T2) at a constant temperature of 290 centigrade +/- 10 centigrade,and then allowed to return to room temperature over a specified time.