Tempered Glass
Tempered glass is to heat the glass to a temperature lower than the softening temperature, and then conduct uniform and rapid cooling. The outside of glass will be fixed due to rapid cooling, while the inside will continue to shrink, resulting in compressive stress on the surface of glass and tensile stress on the inside. To break the tempered glass, the internal stress must be offset first, so that the mechanical strength and thermal stability of the glass are improved.