Chemical tempered glass is actually a type of pre-stressed glass. To improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of the glass. When the glass is subjected to external forces, it first offsets the surface stress, thereby improving its load-bearing capacity, enhancing its own resistance to wind pressure, heat and cold, and impact.

The main advantages of chemically tempered glass are four:

The strength is 5 to 10 times higher than that of ordinary glass, the bending strength is 3 to 5 times that of ordinary glass, and the impact strength is 5 to 10 times that of ordinary glass. It not only improves strength but also improves safety. Compared with glass of the same thickness, the strength of chemical tempering is significantly better than that of physical tempering.

Safety in use is the second major advantage of tempered glass. Its increased load-bearing capacity improves its fragile nature. The resistance to rapid cooling and rapid heating of chemically tempered glass is 2 to 3 times higher than that of ordinary glass. It can generally withstand temperature changes of more than 150LC, has obvious effects on preventing thermal explosion, and will never self-explode.

Due to different processing methods, tempered products will not have any deformation, will not change the shape of the product, and can be tempered regardless of product shape. For example, arc, cylindrical, bottle, box, and flat shapes can be processed without deformation.

The tempering effect on ultra-thin products is remarkable, and the existing technology is very mature. The tempering effect on glass with a thickness of 0.2 to 5.0 mm is very good, and no bending deformation occurs.

2. Production principle

Chemical tempered glass is manufactured using a low-temperature ion exchange process. The so-called low-temperature refers to the range of exchange temperature not higher than the glass transition temperature, which is relative to the temperature range above the transition temperature and below the softening point of the high-temperature ion exchange process.The simple principle of low-temperature ion exchange process is to exchange ions with smaller radii in the glass surface layer with ions with larger radii in the solution in an alkaline salt solution at around 400 ℃. For example, lithium ions in the glass are exchanged with potassium or sodium ions in the solution, and sodium ions in the glass are exchanged with potassium ions in the solution. By utilizing the difference in volume of alkali ions, compressive stress is formed on the glass surface layer. The number of large ions squeezed into the surface of the glass is directly proportional to the compressive stress on the surface, so the number of ion exchanges and the depth of the exchanged surface are key indicators of the enhancement effect. Due to the uniform ion exchange layer, the chemical tempered glass method has a significant effect on strengthening thin glass, especially suitable for strengthening glass with a thickness of less than 5mm.

3. Application scope

Chemically tempered glass is suitable for use in the following building environments, with requirements for reducing self weight, as well as certain requirements for impact strength, bending strength, and resistance to cold and hot impacts, such as: mobile phone screen glass cover, computer TV screen glass, space shuttle, fighter mobile hood, kitchen cabinet glass, decorative glass, electronic panel glass, windows and ceilings of agricultural greenhouses, doors and windows of mobile homes, etc. Mature process technology, ultra-low energy consumption, high-quality products, and more products using chemical tempering have become a trend.