Tempered glass hardware, which has a compressive stress on the surface of is supplied by glass hardware suppliers and widely used on glass fixing brackets and sliding glass door shower enclosure. The tempering method was used to reinforce the glass, which began in France in 1874.
Tempered glass hardware is a safety glass and it is actually a type of pre-stressed glass. In order to increase the strength of the glass, chemical or physical methods are usually adopted to form compressive stress on the surface of the glass. When the glass is subjected to external force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the resistance of the glass to wind pressure, cold and heat, impact and so on.
Tempered glass hardware has two significant advantages. The first is that the strength of tempered glass is several times higher than that of ordinary glass and it is resistant to bending. The second is safety in use, and its load-bearing capacity is improved to improve the fragile nature. Even if the tempered glass is broken, it will become small pieces without sharp angle, which greatly reduced the damage to the human body. The quenching and rapid heat properties of tempered glass are 3 to 5 times higher than that of ordinary glass, and generally can withstand temperature changes of more than 250 degrees, which has obvious effects on preventing thermal cracking. It is one of the safety glasses that guarantee the safety of qualified materials for high-rise buildings.
Tempered glass hardware is obtained by first cutting the ordinary annealed glass into the required size and then heating it to about 700 degrees near the softening point, and then performing rapid and uniform cooling (usually 5-6mm glass is heated at 700°C for 240 seconds), cooling it down for about 150 seconds while 8-10mm glass is heated at 700 °C for about 500 seconds, and the temperature is lowered by about 300 seconds. In short, depending on the thickness of the glass, the time for heating and cooling is different. After the tempering treatment, the surface of the glass forms a uniform compressive stress, while the inside forms a tensile stress, which improves the bending and impact strength of the glass, and its strength is about four times that of the ordinary annealed glass. The tempered glass that has been tempered can no longer be processed or damaged by any cutting, grinding, etc., otherwise it will “break the bones” due to the failure of the uniform compressive stress.