Tempered glass is made by heating a general glass to about 630 degrees and then rapidly cooling it by strong wind. Through these processes, tempered glass has a physical strength three times higher than that of ordinary glass, and the thermal shock resistance also becomes stronger at the same time. During these processes, the surface of the glass forms a pre-stress while condensing energy inside the glass. However, during the tempering process, due to the prestressing inside the glass and the condensation energy, when it is damaged or self-exploded, its condensed energy will be released, and the fragments will be scattered and an explosion sound will be generated. External factors such as strong mechanical impact, surface cracks, and thermal shock are likely to damage the tempered glass, and the impurities, bubbles, and nickel sulfide contained in the glass may also damage the tempered glass. There are many reasons for the damage of tempered glass, and some self-explosive phenomena are often unpredictable.
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