Which glass is best for windows and doors?

Introduction of Tempered Glass

 

    Tempered glass belongs to the safety glass confirmed by regulations, widely used in places with high requirements for mechanical strength and safety, such as glass doors, building curtain walls, façade windows, interior partitions, furniture, near the heat source and the location of the hot and cold shocks more intense partition. Tempered glass characteristics determine the spontaneous explosion can not be avoided, and can not predict the time and conditions of spontaneous explosion, therefore, in order to prevent the harm brought about by the spontaneous explosion of tempered glass, in the process of glass processing and installation will often take some measures or methods to reduce the loss of tempered glass explosion.

 

Factors affecting the tempered glass burst:

 

1, glass damage factors: glass surface, edge due to handling, installation, maintenance carelessly, resulting in blowout, surface corrosion, chipping, etc. are easy to damage the tempered glass stress triggered by the spontaneous explosion of tempered glass.

2, installation factors: in the installation process, if the installation gap is small or glass directly in contact with the frame, under the sun's rays, the expansion coefficient of the glass and the frame is not the same, it is easy to make the glass edges or corners to produce extrusion pressure, inducing tempered glass burst.

3, glass processing factors: drilling or cutting the corner of the tempered glass is easy to burst.

4, natural factors: strong typhoons and other windstorms lead to wind pressure design failure, which can cause tempered glass burst.

 

Reduce the methods of tempered glass explosion:

 

1) avoid excessive stress on the glass tempering;

2) the use of the original sheet containing less nickel sulfide stones, that is, the use of high-quality original sheet;

3) secondary heat treatment of tempered glass, usually called detonation or homogenization. When secondary heat treatment is performed, it is generally divided into 3 stages: warming, holding and cooling process. Heating stage for the surface temperature of the glass from room temperature to 280 ℃ process; insulation stage for all the surface temperature of the glass are up to 290 ℃ ± 10 ℃, and at least keep 2h this process; cooling stage from the glass after the completion of the insulation stage began to fall to room temperature 75 ℃ when the process; the entire secondary heat treatment process should be avoided to avoid the furnace chamber temperature of more than 320 ℃, the surface temperature of the glass more than 300 ℃, otherwise The tempering stress of the glass will relax due to overheating, thus affecting its safety.

4)Paste high performance polyester film on the glass. Polyester film is commonly known as security explosion-proof film, glass broken for various reasons, you can stick to the glass fragments to prevent splashing, to protect people inside and outside the building from the harm of splashing glass fragments, wind and rain and other foreign objects are difficult to cause damage to the interior. Safety explosion-proof film can be connected with organic adhesive together with the frame edge system to form a glass film protection system to prevent falling.

 

Summary: Currently, tempered glass has a four out of 1,000 self-explosion rate, the reason why tempered glass most of the self-explosion because the temperature change is too fast uneven stress and self-explosion, sharp cooling and heating will cause this self-explosion phenomenon. According to the actual situation in a year to two years of use if there is no spontaneous explosion, then the probability of spontaneous explosion will be quite small.

 

Glass is an indispensable part of the windows and doors, in the early construction of windows and doors are single-layer plate glass. After continuous development, there are now tempered glass, insulating glass, laminated glass, bulletproof glass and so on. The current door and window products use a lot of tempered glass.

 

First, how to distinguish between tempered glass and ordinary glass?

 

1, observe the glass mark, observe the angle of the glass whether there is a tempered 3C mark, mark 3c basically for tempered glass. But if the 3C mark on your glass can be wiped off by hand, you can fundamentally judge the fake tempered glass.

2, from the side to see whether the glass has a slight deformation, glass fired at high temperatures, there is a slight deformation of the phenomenon, only from the side of the glass, the front is generally not easy to see.

3, observe the glass fragments, usually after the rupture of the glass has a larger fragmentation, there are sharp corners, easy to hurt. Toughened glass glass rupture particle-like, blunt angle, not easy to hurt people.

 

Second, tempered glass is divided into shape: plane tempered glass and curved tempered glass

 

Commonly used plane tempered glass thickness of 2-19mm ; commonly used curved tempered glass thickness of 5- 10mm.

 

Third, the characteristics of tempered glass.

1, impact strength is 4-5 times higher than ordinary glass; bending strength, 5 times higher than ordinary plate glass; good thermal stability, can accept temperature changes of 200 ℃; with bright, bright, not cut and so on. In the event of strong impact damage, the fragments are in the form of fine particles without sharp corners, so it is also known as safety glass.

2,After tempering, the thickness will be slightly thinner. Because the glass is softened by heat, after the rapid cooling with a strong wind, the glass crystal inside the gap becomes smaller, the pressure becomes larger, so the glass is thinner after tempering than before tempering. In general, 4.6mm glass after tempering thinning 0.2-0.8mm, 8-19mm glass after tempering thinning 0.9-1.8mm, depending on the equipment to decide.