Tempered glass is a type of safety glass. In fact, it is also a kind of prestressed glass. In order to increase the strength of the glass, chemical or physical methods are usually used to form compressive stress on the surface of the glass. When the glass is subjected to external force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the wind resistance of the glass itself. Sex, cold and hot, shock and so on.
Tempered glass is a method in which high-quality float glass is heated close to the softening point, and the glass surface is rapidly cooled, so that the compressive stress is distributed on the glass surface, and the tensile stress is in the center layer. Because of the strong equal compressive stress, the tensile stress generated by the external pressure is offset by the strong compressive stress of the glass, thereby increasing the safety of the glass.
Tempered glass has the following characteristics:
1. Strength: The mechanical strength, impact resistance and bending strength of glass after tempering can reach 4-5 times that of ordinary glass.
2, the thermal stability is improved: tempered glass can withstand a large temperature difference without damage, and the resistance to variable temperature difference is three times that of ordinary float glass of the same thickness. Can withstand temperature changes of 150 ° C, has a significant effect on preventing thermal cracking.
3. Improved safety: After the tempered glass is damaged, it will quickly show tiny obtuse-angle particles, thus maximizing personal safety. Applications: Furniture, electronics and electrical industry, construction, decoration industry, bath rooms, automobiles, escalators, and other places where safety and temperature differences are particularly needed, and can be used as the original film of insulating glass and laminated glass.
Flat steel and bent tempered glass belong to safety glass. Widely used in high-rise building doors and windows, glass curtain walls, indoor partition glass, lighting ceiling, sightseeing elevator access, furniture, glass guardrails and so on.
The shortcomings and deficiencies of tempered glass:
1. After the tempered glass can no longer be cut and processed, the glass can only be processed to the required size and shape before tempering, and then tempered.
2. Although the strength of tempered glass is stronger than that of ordinary glass, tempered glass has the possibility of self-detonation (self rupture) when the temperature difference changes greatly, and common glass does not have the possibility of self-explosion.
After the tempering of glass, the mechanical strength of the glass surface is 3 to 5 times higher than that of ordinary glass, but the corners of the tempered glass are relatively fragile and may break after being subjected to external forces. In addition, if the outside temperature changes frequently, tempered glass may also self-explosion. Door and window postal old wolf reminds everyone that when using tempered glass products, be careful not to bump the corners. It is recommended not to make the glass temperature change drastically in a short period of time to avoid self-explosion.
In addition, the middle portion of the tempered glass is the strongest, and the four corners and the edges are the weakest. If there is an emergency, the tempered glass can be broken and escaped. The best way is to hit the edges and corners of the glass with a safety hammer or other sharp lumps, especially in the middle of the upper edge of the glass. Once the glass has cracks, it is easy to smash the whole glass.