Bending tempered glass or bending heat strengthened glass is made by heating the original float glass to the softening temperature to make the glass bend and then rapidly and uniformly cooled by special equipment. There are two processes for producing toughened glass: one is to process ordinary flat glass or float glass under specific process conditions by quenching or air-cooling quenching. The other is to process ordinary flat glass or float glass through an ion exchange method to change the composition of the glass surface to form a laminated stress layer on the glass surface.

Tempered glass has the characteristics of high impact strength (4~5 times higher than ordinary flat glass, high bending strength (5 times higher than ordinary flat glass), good thermal stability, smooth, transparent, and cuttable. Super strong in case of When damaged by impact, the fragments are in the form of scattered fine particles without sharp edges and corners, so it is also called safety glass.

Tempered glass is divided into flat toughened glass and curved toughened glass according to its shape.

Tempered glass is actually a kind of prestressed glass. Usually chemical or physical methods are used to form jade stress on the surface of the glass. When the glass is subjected to external forces, the surface stress is first offset, thereby increasing the bearing capacity and improving the tensile strength of the glass. There are two main advantages of tempered glass: The first is that the strength is several times higher than that of ordinary glass, the bending strength is 3-5 times that of ordinary glass, and the impact strength is 5-10 times that of ordinary glass. The strength is improved at the same time. Improved safety. The second advantage is that the increased load-bearing capacity improves the fragile nature. Even if the toughened glass is damaged, it will appear as small fragments without acute angles, which greatly reduces the damage to the human body. The quenching and heat resistance of tempered glass is 23 times higher than that of ordinary glass. The surface pressure resistance is increased to 69Mpa, which can generally withstand temperature changes above 150 degrees Celsius, which has a significant effect on preventing thermal cracking. However, due to the re-tempered glass In the process, a special technical process is adopted, which will cause the flatness of the surface to be slightly worse than that of flat and strengthened glass.

Principle of tempering

The glass is heated and then rapidly cooled (a bit like metal quenching), so that the inside of the glass has a large tensile stress, and a larger compressive stress is generated on the surface. Its effect is the same as that of prestressed reinforced concrete members using tensile steel bars to generate compressive stress in the part that needs to be reinforced. The difference is that prestressed reinforced concrete only produces compressive stress in some areas, while tempered glass produces compressive stress on the entire surface. The tempering and quenching process of glass is also different from the hardening process of metal surface quenching. The tempering treatment of glass does not harden the surface of the glass, so after the glass is tempered, the ability of the surface to resist scratches and scratches is not significantly improved.