Classification of tempered glass

By Shape
Tempered glass is divided into flat tempered glass and curved tempered glass according to their shape.
There are twelve types of thickness for general flat tempered glass, including 11, 12, 15, and 19mm; There are eight types of thickness for curved tempered glass, including 11, 15, and 19mm. The specific thickness after processing still depends on the equipment and technology of each manufacturer. But curved tempered glass has a maximum curvature limit for each thickness. The commonly known R R is the radius.
2. Tempered glass is divided into flat tempered and bent tempered according to its appearance.
3. Tempered glass is divided into excellent and qualified products based on its flatness. Premium tempered glass for automotive windshields; Qualified products are used for building decoration.
By process
Physical tempered glass is also known as quenched tempered glass. It involves heating ordinary flat glass in a heating furnace to a softening temperature close to 600 ℃, and then removing internal stress through its own deformation. The glass is then removed from the heating furnace, and high-pressure cold air is blown onto both sides of the glass using multiple nozzles, allowing it to quickly and uniformly cool to room temperature to obtain tempered glass. This type of glass is in a stress state of internal tension and external compression. Once local damage occurs, stress release will occur, and the glass will be broken into countless small pieces. These small pieces have no sharp edges and are not easy to harm people.
2. Chemical tempered glass is used to improve the strength of glass by changing the chemical composition of its surface, and is generally tempered using ion exchange method. The method is to immerse silicate glass containing alkali metal ions into a molten lithium (Li+) salt, causing Na+or K+ions on the surface of the glass to exchange with Li+ions, forming a Li+ion exchange layer on the surface. Due to the smaller expansion coefficient of Li+compared to Na+or K+ions, 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 inner layer tension and outer layer pressure, Its effect is similar to that of physical tempered glass.
By degree of steel
1. Tempered glass: Tempered degree=2-4N/cm, surface stress of tempered glass in glass curtain walls α≥ 95Mpa;
2. Semi tempered glass: Tempering degree=2N/cm, surface stress of glass curtain wall semi tempered glass 24Mpa ≤ α≤ 69Mpa;
3. Ultra strong tempered glass: Tempering degree>4N/cm.