Production and classification of tempered glass
Quality tempered glass company obtain the tempered glass by cutting ordinary annealed glass to the required size, then heating it to about 700 degrees close to the softening point, and then performing rapid and uniform cooling (usually 5-6MM glass is heated at 700 degrees for about 240 seconds, Cooling for about 150 seconds. 8-10MM glass is heated at 700 degrees for about 500 seconds, and the temperature is cooled for about 300 seconds. In short, the heating and cooling time is different according to the thickness of the glass). After tempering, uniform compressive stress is formed on the surface of the glass, and 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 subjected to any cutting, grinding, or other processing or damage, otherwise it will be "spattered" due to the destruction of the uniform compressive stress balance.
1. Tempered glass is divided into flat tempered glass and curved tempered glass according to its shape.
Generally, there are twelve thicknesses of flat tempered glass including 11, 12, 15, 19mm, and eight thicknesses of curved tempered glass, including 11, 15, 19mm. The specific thickness after processing still depends on the equipment and technology of each manufacturer. However, curved surface (ie, curved tempered) tempered glass has a maximum arc limit for each thickness. That is, R R is usually the radius.
2. Tempered glass is divided into flat tempered and curved tempered according to its appearance.
3. Toughened glass is divided into high-quality products and qualified products according to its flatness. High-quality tempered glass is used for automobile windshield; qualified products are used for architectural decoration.
According to the process, it is divided into physical tempered glass and chemical tempered glass
⒈Physical tempered glass is also called tempered tempered glass. It heats ordinary flat glass in a heating furnace to close to the softening temperature of the glass (600°C), eliminates internal stress through its own deformation, and then removes the glass from the heating furnace, and then uses a multi-head nozzle to blow high-pressure cold air on the glass. On both sides, make it cool to room temperature quickly and evenly, and then tempered glass can be obtained. This kind of glass is in a stress state of internal tension and external compression. Once locally damaged, stress will be released. The glass is broken into numerous small pieces. These small pieces have no sharp edges and corners and are not easy to hurt people.
⒉Chemical toughened glass improves the strength of the glass by changing the chemical composition of the surface of the glass. Generally, it is tempered by the ion exchange method. The method is to immerse the silicate glass containing alkali metal ions in the molten lithium (Li+) salt to exchange the Na+ or K+ ions on the surface of the glass with Li+ ions, forming a Li+ ion exchange layer on the surface. The expansion coefficient is smaller than Na+ and K+ ions, so that the outer layer shrinks less and the inner layer shrinks more during the cooling process. When cooled to room temperature, the glass is also in a state of tension on the inner layer and pressure on the outer layer. Its effect Similar to physical tempered glass.
According to the degree of toughness
⒈Tempered glass: tempering degree=2~4N/cm, surface stress of tempered glass of glass curtain wall α≥95Mpa;
⒉Semi-tempered glass: Tempering degree=2N/cm, surface stress of semi-tempered glass of glass curtain wall 24Mpa≤α≤69Mpa;
⒊Super tough tempered glass: Tempering degree>4N/cm.
Quality tempered glass company will same more money and time for you.