The Difference Between Semi-toughened Glass And Toughened Glass
Toughened glass is actually a kind of prestressing glass. In order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of glass. When the glass bears external force, the surface stress is first offset, which improves the...
Toughened glass is actually a kind of prestressing glass. In order to improve the strength of glass, chemical or physical methods are usually used to form compressive stress on the surface of glass. When the glass bears external force, the surface stress is first offset, which improves the bearing capacity and the tensile strength of glass. There are two main advantages of toughened glass. The first is that the strength of toughened glass is several times higher than that of ordinary glass. The flexural strength is 3-5 times higher than that of ordinary glass, and the impact strength is 5-10 times higher than that of ordinary glass. The strength and safety of toughened glass are also improved. Safety of use is the second main advantage of physical toughened glass. The increase of its carrying capacity improves the fragility. Even if the toughened glass is damaged, it also shows small fragments without sharp angle, which greatly reduces the harm to human body. The quench and heat resistance of tempered glass is 2-3 times higher than that of ordinary glass, and it can generally withstand the temperature difference of more than 150 C, which has obvious effect on preventing thermal cracking.
Semi-toughened glass is also called heat-reinforced glass. It is a kind of glass between ordinary flat glass and toughened glass. It has the characteristics of high strength of toughened glass. At the same time, it avoids the shortcomings of poor flatness, easy self-explosion and integral crushing once damaged. When semi-tempered glass is damaged, radial cracking along the crack source occurs, and there is generally no tangential crack propagation, so the whole body can not collapse after failure. Semi-toughened glass is suitable for curtain walls and windows in buildings, and can be made into semi-toughened coated glass. Its image distortion is better than that of toughened glass. However, it should be noted that semi-toughened glass does not belong to the scope of safety glass, because once broken, there are still sharp debris that may hurt people, and can not be used in skylights and occasions where human impact may occur. The surface compressive stress of semi-toughened glass ranges from 24 MPa to 69 Mpa, and the surface pressure of toughened glass should be greater than 69 MPa. The production process of semi-toughened glass is the same as that of toughened glass, only the air pressure at quenching station is different, and the ability of quenching and heat resistance is less than that of toughened glass.
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