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Do you know the strengths and weaknesses of tempered glass used in windows and doors?

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Do you know the strengths and weaknesses of tempered glass used in windows and doors?

Release date:2018-06-13 Author: Click:

Tempered glass is a safety glass. Tempered glass is actually a kind of prestressed glass. In order to increase the strength of glass, chemical or physical methods are usually used to form compressive stress on the glass surface. When the glass receives external force, it first counteracts the stress of the surface layer, thereby increasing the carrying capacity and strengthening the glass's own resistance. Wind pressure, cold and heat, impact and so on.


The first is that the strength is several times stronger than ordinary glass, and it is resistant to bending.

The second is the use of safety. Its increased carrying capacity improves the fragile nature. Even if the toughened glass breaks down, it is a small piece with no acute angle, and the damage to the human body is reduced. Tempered heat resistance of tempered glass is 2 to 3 times higher than that of ordinary glass. Generally, it can withstand temperature changes of 150C or more, which has a significant effect on preventing hot burst.

Safety: When the glass is destroyed by an external force, the fragments are broken into small, obtuse-angle particles that resemble a honeycomb and are not likely to cause harm to the human body.

High strength: The impact strength of tempered glass with 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 3 times the temperature difference of ordinary glass, and can withstand temperature changes of 150 °C.


Flat tempered, curved tempered glass is a safety glass. Widely used in high-rise building doors and windows, glass curtain walls, indoor partition glass, lighting ceiling, sightseeing elevator access, furniture, glass guardrails and so on.

Shortcomings and inadequacies

Disadvantages of tempered glass:

1. After the tempered glass can no longer be cut and processed, the glass can only 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-detonation (self rupture) when the temperature difference changes greatly, and common glass does not have the possibility of self-explosion.

Avoid measures: After the tempering of glass, the mechanical strength of the glass surface is 3 to 5 times higher than that of ordinary glass, but the corners of the tempered glass are relatively fragile and may break after being subjected to external forces. In addition, tempered glass may bleed if the outside temperature changes frequently. Relevant persons reminded the public that when using tempered glass products, care should be taken not to touch corners. It is recommended that the glass temperature should not be changed as much as possible to avoid self-explosion.

Scope of application: Since the broken glass breaks into uniform small particles and there is no universal glass knife-like sharp corner after being broken, it is called safety glass and is widely used in automobiles, interior decoration, and high floors to open. window.

Emergency methods:

Safety Tip: An assisted escape tool in a closed cabin. It is generally installed in a place that is easily accessible in closed compartments such as automobiles. In the event of an emergency such as a fire in a car or a car falling into the water, it can be easily removed and smashed to clear the glass door to escape.

Uses: It is mainly used to break glass to escape in case of emergency. The blade of hammer handle tail is used to cut off the safety belt to escape.

Scope: Mainly used for bus, passenger vehicles, trains and other vehicle configurations.

How to use: The safety hammer is mainly used with its conical tip, because the contact area of the tip is very small, so when the glass is hammered with a hammer, the contact point pressure on the glass (not the pressure, but the pressure per unit area) This is quite large. This principle is somewhat similar to the thumbtack. The film is easily pierced and causes the car glass to be exposed to a large external force at this point to cause slight cracking. For tempered glass, a little cracking occurs. This means that the stress distribution inside the entire glass is destroyed, and innumerable spider web cracks are generated instantaneously. At this time, the glass fragments can be removed by gently tapping the hammer again.

In addition, the middle part of the tempered glass is the strongest, with the four corners and the edges being the weakest. The best way is to hit the edges and corners of the glass with a safety hammer, especially in the middle of the top edge of the glass. Once the glass cracks, it is easy to smash the entire glass.

Tempered glass features: When tempered glass is heated near the softening point, the tempered glass is cooled rapidly on the glass surface to distribute the compressive stress on the glass surface, while the tensile stress is in the center layer. Because there is a strong equivalent compressive stress, the tensile stress produced by the external pressure is offset by the strong compressive stress of the glass, thereby increasing the safety of the glass.

1. Strength: The mechanical strength, impact resistance and bending strength of glass after tempering can reach 4-5 times that of ordinary glass.

2, thermal stability: tempered glass can withstand a huge temperature difference without damage, ability to resist the temperature difference is the same thickness of ordinary float glass 3 times.

3. Increased safety: Tempered glass is quickly exposed to tiny, obtuse-angle particles after it is strongly damaged, thereby maximizing personal safety. Applications: furniture, electrical and electronic industries, construction, decoration industries, bath houses, automobiles, escalators, and other places where there is a special need for safety and where there are drastic changes in temperature, and can be used as the original piece of insulating glass and laminated glass.

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