Tempered glass is obtained by first cutting an ordinary annealed glass into a desired size, then heating it to a near softening point, and then performing rapid and uniform cooling. After tempering, the surface of the glass forms a uniform compressive stress, while the inside forms a tensile stress, which greatly improves the performance of the glass. The tensile strength is more than three times that of the latter, and the impact resistance is more than five times that of the latter.
Since the tempered glass is broken, the fragments are broken into uniform small particles and there is no common glass blade-like sharp corner, which is called safety glass and is widely used in automobiles and interior decoration.
In the home, the sharp knives and sharp corners of the ordinary glass are easy to cut children or impacters, causing personal injury. After the glass is broken, it becomes a small particle or a knife. This is the main difference between tempered glass and ordinary glass.
Due to the stress on the surface of the tempered glass, this characteristic is also an important sign to identify true and false tempered glass. That is, the tempered glass can see the colored stripes on the edge of the glass through the polarizing plate, and the surface of the glass. When you look at the layers, you can see black and white spots. Polarizers can be found in camera lenses or glasses, and attention is paid to the adjustment of the light source during viewing, which makes it easier to observe.