Classification of tempered glass

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By shape

1. Tempered glass is divided into flat tempered glass and curved tempered glass according to shape.

Generally, the thickness of flat tempered glass is 11, 12, 15, 19mm, etc.; the thickness of curved tempered glass is 11, 15, 19mm, etc., and the specific thickness after processing depends on the equipment and technology of each manufacturer. But curved (ie curved tempered) tempered glass has an arc limit for each thickness. That is to say, R R is the radius.

2. Tempered glass is divided into flat tempered and curved tempered according to its appearance.

3. Tempered glass is divided into: superior products and qualified products according to its flatness. High-quality tempered glass is used for car windshields; qualified products are used for architectural decoration.

By process

⒈Physically tempered glass is also known as tempered tempered glass. It is a method of heating ordinary flat glass to a temperature close to the softening temperature of glass (600°C) in a heating furnace, removing the internal stress through its own deformation, then removing the glass from the heating furnace, and then blowing high-pressure cold air to the glass with a multi-head nozzle. Tempered glass can be obtained by cooling it quickly and evenly to room temperature on both sides. This kind of glass is in a stress state of internal tension and external compression. Once local damage occurs, the stress will be released, and the glass will be broken into countless small pieces. These small pieces have no sharp edges and corners and are not easy to hurt people.

⒉Chemical tempered glass is to improve the strength of the glass by changing the chemical composition of the surface of the glass, generally using the ion exchange method for tempering. The method is to immerse the silicate glass containing alkali metal ions into the molten lithium (Li+) salt, so that the Na+ or K+ ions on the glass surface are exchanged with Li+ ions, and a Li+ ion exchange layer is formed on the surface. The expansion coefficient is smaller than the 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 where the inner layer is pulled and the outer layer is compressed. Similar to physical tempered glass.

According to the degree of toughness

⒈ Tempered glass: degree of tempering = 2~4N/cm, surface stress of tempered glass of glass curtain wall α≥95Mpa;

⒉Semi-tempered glass: degree of toughness=2N/cm, the surface stress of semi-tempered glass of glass curtain wall is 24Mpa≤α≤69Mpa;

⒊Strengthened tempered glass: degree of tempering>4N/cm.