Tempered glass is a safety glass. Tempered glass is actually a kind of prestressed glass. In order to increase the strength of the 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 force, the surface stress is first offset, thereby improving the bearing capacity and enhancing the resistance of the glass itself. Wind pressure, cold and heat, impact and so on.
First, the strength is several times higher than that of ordinary glass, and it is resistant to bending.
Second, the use of safety, its increased carrying capacity improves the fragile nature, even if the tempered glass is destroyed, there are small fragments without sharp angles, and the damage to the human body is reduced. The quenching and rapid heat properties of tempered glass are 2 to 3 times higher than that of ordinary glass, and generally can withstand temperature changes of 150 C or more, which has obvious effects on preventing thermal cracking.
Safety: When the glass is destroyed by external force, the fragments become small, obtuse-angle particles resembling honeycombs, which are not easy to cause harm to the human body.
High strength: The impact strength of tempered glass of the same thickness is 3 to 5 times that of ordinary glass, and the bending strength is 3 to 5 times that of ordinary glass.
Thermal stability: Tempered glass has good thermal stability, can withstand a temperature difference of three times that of ordinary glass, and can withstand a temperature difference of 150 °C.
Flat steel and bent tempered glass belong to safety glass. Widely used in high-rise building doors and windows, glass curtain wall, indoor partition glass, lighting ceiling, sightseeing elevator access, furniture, glass railings, etc.
Disadvantages of tempered glass:
1. The tempered glass can no longer be cut and processed. The glass can be processed to the required size and shape before tempering, and then tempered.
2. Although the strength of tempered glass is stronger than that of ordinary glass, tempered glass has the possibility of self-explosion (self-rupture) when the temperature difference changes greatly, while ordinary glass does not have the possibility of self-explosion.
Avoidance measures: After glass tempering, the mechanical strength of the glass surface is 3 to 5 times higher than that of ordinary glass, but the tempered glass corner is relatively fragile and may break after being subjected to external force. In addition, if the outside temperature changes frequently, tempered glass may also self-explosion. Relevant persons are reminded that when using tempered glass products, they should be careful not to bump the corners. It is recommended that the temperature of the glass should not be changed drastically to avoid self-explosion.
Scope of application: Since the tempered glass is broken, the fragments will break into uniform small particles and have no common glass knives. It is called safety glass and is widely used in automobiles and interior decoration, as well as high floors. window.
Safety 捶: An auxiliary escape tool in a closed compartment. It is generally installed in a place that is easily accessible in a closed compartment such as a car. In an emergency such as a fire or a car falling into the water, it is convenient to take out and smash the glass window door to escape smoothly.
Uses: Mainly used to break glass escape in emergency situations, the hammer handle tail blade is used to cut the seat belt to escape.
Scope: Mainly used for bus, passenger vehicles, trains and other vehicle configurations.
How to use: The safety hammer mainly uses its conical tip. Since the contact area of the tip is small, the pressure of the contact point against the glass when using the hammer glass (not the pressure, but the pressure per unit area) Quite large, this is similar to the principle of the pushpin, the film is easily punctured, and the car glass is subjected to a large external force at this point to produce a slight crack, and for tempered glass, a little cracking This means that the stress distribution inside the whole glass is destroyed, so that numerous spider web cracks are generated in an instant. At this time, the glass fragments can be removed by gently rubbing with a hammer.
In addition, the middle portion of the tempered glass is the strongest, and the four corners and the edges are the weakest. The best way is to hit the edge and four corners of the glass with a safety hammer, especially in the middle of the upper edge of the glass. Once the glass has cracks, it is easy to smash the whole glass.
Characteristics of tempered glass: Tempered glass is designed to heat the high-quality float glass near the softening point, and rapidly cool the glass surface to distribute the compressive stress on the glass surface, while the tensile stress is in the center layer. Because of the strong equal compressive stress, the tensile stress generated by the external pressure is offset by the strong compressive stress of the glass, thereby increasing the safety of the glass.
1. Increased strength: After tempering, the mechanical strength, impact resistance and flexural strength of the glass can reach 4-5 times that of ordinary glass.
2, the thermal stability is improved: tempered glass can withstand a large temperature difference without damage, and the resistance to variable temperature difference is three times that of ordinary float glass of the same thickness.
3, the safety is improved: after the tempered glass is damaged by the strong, it will quickly show the tiny obtuse-angle particles, thus maximizing personal safety. Applications: Furniture, electrical and electronic industry, construction, decoration industry, bath rooms, automobiles, escalators, and other places where safety and temperature differences are particularly needed, and can be used as the original film of insulating glass and laminated glass.