The phenomenon of spontaneous explosion of tempered glass without direct mechanical external force is called self explosion of tempered glass. Self explosion is one of the unique properties of tempered glass, and there are many reasons for the occurrence of self explosion of tempered glass covers, but it can be simply summarized into the following two types:

1. The impact of glass quality defects: The parts of glass that contain stones and impurities are the thin points of tempered glass and also the places where stress accumulates. Especially if the stone is located in the tensile stress zone of tempered glass, it is an important factor leading to explosion. Stones exist in glass and have a different coefficient of expansion than the vitreous body. The stress in the crack area around the stone after glass tempering will increase exponentially.

When the expansion coefficient of the stone is smaller than that of glass, the tangential stress around the stone is in tension. The crack propagation that accompanies the stone is highly prone to occur.

2. Due to improper heating process or operation, defects such as scratches, explosions, and deep edges may form on the surface of the glass, which can easily lead to stress concentration or self explosion of tempered glass.

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