2. Glass quality defects. The part of glass containing stones and impurities is the weak point of tempered glass and the place where stress is concentrated. Especially if the stone is in the tensile stress zone of tempered glass, it is an important factor leading to the explosion.
3. Defects such as scratches, cracks and deep explosion edges on the glass surface caused by improper addition process or operation are easy to cause stress concentration or self-explosion of tempered glass.