Types of tempered glass varieties:
1. Tempered glass varieties can be classified into flat toughened glass and curved toughened glass according to their shapes.
Generally, the thickness of flat tempered glass is 3.4, 4.5, 5, 5.5, 6, 7.6., 8, 9.2, 11, 12, 15 and 19mm; the thickness of curved tempered glass is 3.4, 4.5, 5.5, 7.6, 9.2, 11, 15 and 19mm. The specific thickness after processing depends on the manufacturer's equipment and technology. However, curved surface (i.e. curved tempered) tempered glass has a maximum arc limit for each thickness. That is to say R, R is the radius.
2. According to the appearance, tempered glass varieties can be divided into horizontal tempered glass and curved tempered glass. The thicknesses of flat tempered glass is 4, 5, 6, 8, 10, 12, 15 and 19mm; the thicknesses of curved tempered glass is 5, 6 and 8mm.
3. According to the flatness, tempered glass varieties are divided into high-quality products and qualified products. High-quality tempered glass is used for automobile windshield; qualified products are used for architectural decoration.
4. According to the production technology, tempered glass varieties are divided into:
1) Physically toughened glass. When ordinary flat glass is heated in a heating furnace to close to the softening temperature of the glass (600℃), the internal stress is eliminated through its own deformation. And then the glass is removed from the heating furnace, and high-pressure cold air is blown onto the glass with a multi-head nozzle on both sides, which makes it cool to room temperature quickly and evenly. 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 will break into numerous small pieces. These small pieces have no sharp edges and corners and are not easy to hurt people.
2) Chemically tempered glass. To improve the strength of the glass by changing the chemical composition of the surface of the glass, generally an ion exchange method is used for tempering. The method is to immerse the silicate glass containing alkali metal ions into 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 is similar to physical tempered glass.
5. According to tempering degree, tempered glass varieties are divided into:
1) Tempered glass: tempering degree=2~4N/cm, surface stress of tempered glass for glass curtain wall α≥95Mpa;
2) Semi-tempered glass: tempering degree=2N/cm, surface stress of semi-tempered glass of glass curtain wall 24Mpa≤α≤69Mpa;
3) Super toughened glass: tempering degree>4N/cm.