How is tempered glass made?
Tempered glass is obtained by first cutting ordinary annealed glass to the required size, then heating it to about 700 degrees close to the softening point, and then rapidly and uniformly cooling it (usually 5-6MM glass is heated at a high temperature of 700 degrees for about 240 seconds, Cool down for about 150 seconds. 8-10MM glass is heated at a high temperature of 700 degrees for about 500 seconds, and cooled for about 300 seconds. In short, according to the thickness of the glass, the time for heating and cooling is also different). After tempering, uniform compressive stress is formed on the surface of the glass, while tensile stress is formed inside, which improves the bending and impact strength of the glass, and its strength is about four times that of ordinary annealed glass. The tempered glass that has been tempered cannot be cut, ground, etc. or damaged, otherwise it will be "shattered" due to the destruction of the uniform compressive stress balance.