There are many reasons for the cracking of tempered glass covers, which can be briefly summarized as follows:

1. The impact of glass quality defects: The parts of glass containing stones and impurities are the weak points and stress concentration areas of tempered glass. Especially if the stone is located in the tensile stress zone of tempered glass, it is an important factor leading to cracking. Stones exist in glass and have a different coefficient of expansion than the vitreous body. After glass tempering, the stress in the crack area around the stone 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 processing or operation, the surface of glass may have defects such as scratches, burrs, and deep edges, which can easily lead to stress accumulation or cause tempered glass to self destruct.

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