Tempered Glass Classified By Process

1. Physically tempered glass, also known as quenched tempered glass. It is to heat ordinary flat glass in a heating furnace to a softening temperature close to 600 ℃, eliminate internal stress through its own deformation, then remove the glass from the heating furnace, and then use a multi head nozzle to blow high-pressure cold air towards both sides of the glass, allowing it to quickly and uniformly cool to room temperature to produce tempered glass. This type of glass is in a stress state of internal tension and external compression. Once local damage occurs, stress release occurs, and the glass is broken into countless small pieces. These small pieces have no sharp edges and are not easy to harm people.
2. Chemically tempered glass is used to improve the strength of glass by changing the chemical composition of its surface, usually through ion exchange tempering. 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+and 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 compression, Its effect is similar to that of physically tempered glass.