What is the difference between tempered glass and ordinary glass

What is the difference between ordinary glass and tempered glass?

Tell you: the difference between ordinary glass and tempered glass

Tempered glass is actually a kind of pre-stressed glass, usually using chemical or physical methods, the formation of compressive stress on the surface of the glass, the glass is subjected to external forces to offset the surface stress first, which improves the load-bearing capacity and improves the tensile strength of the glass. Tempered glass has two main advantages: the first is the strength of ordinary glass several times, bending strength is 3-5 times the ordinary glass, impact strength is 5-10 times the ordinary glass, improve the strength of the same time also improves the safety. The second advantage is that its bearing capacity increases to improve the fragile nature, even if the tempered glass damage is also a small fragments without sharp edges, the harm to the human body has been greatly reduced. Toughened glass resistance to rapid cold and heat properties compared to ordinary glass has 2-3 times the increase in surface pressure to 69Mpa, generally can withstand temperature changes of more than 150 degrees Celsius, to prevent thermal cracking has a significant effect, but due to the process of tempering the glass and then take a special technological process, which leads to a slightly worse than the flat surface of the flat glass and reinforced glass flatness.

Toughened glass (also called semi-tempered glass) is a variety between ordinary flat glass and tempered glass, its strength is higher than ordinary glass, but lower than tempered glass, its image distortion is better than tempered glass. However, it should be noted that the reinforced glass does not belong to the range of safety glass, its once broken, there are still sharp fragments hurt people, the surface pressure of reinforced glass should be between 25Mpa to 52Mpa. So we must ask the business in the purchase of glass supplies in the end is tempered glass or reinforced glass.

Tempered glass principle

The glass is heated, and then cooled quickly (a bit like metal quenching), so that the glass has a large internal tensile stress, while the surface of the greater compressive stress. This works in the same way that prestressed reinforced concrete elements use tensile reinforcement to create compressive stresses in the part to be reinforced.

The difference is that prestressed reinforced concrete creates compressive stresses in only a portion of the area, whereas tempered glass creates compressive stresses on the entire surface. The hardening process of tempering glass is also different from the hardening process of surface quenching treatment of metals. The toughening of glass does not harden the surface of the glass, and thus the resistance of the surface to scuffs and scratches is not significantly improved after the glass is toughened