[China Glass Net] A high-grade fine decoration real estate in Changsha Hexi, 25 floors, rupture of oversized tempered glass, only because of the installation of hangers to the corners of the glass, fortunately, the glass did not break down. The head of the house, Liu girl, waited for a month before the tempered glass was fired. When several workers carried the glass to the freight elevator, everyone was dumbfounded. The glass went in, but the elevator could not be closed. After several consultations, 8 people It took the professional worker three hours to slowly shift the glass to 25 layers.
Tempered glass self-explosion rate of three thousandths
   Accidents in the breakdown of high-rise tempered glass occur almost every year. There are three main possibilities: only the outer glass is dropped, and the inner glass is still intact, which may be the quality of the glass itself. There is a problem with the structure. The frame structure design of the glazing may be problematic, and it is also possible that the glass is not standardized during installation. Use is not standardized. When switching windows, use too much force, or push the glass directly by hand instead of pushing the handle. There is also the force mentioned in the beginning of the article hitting the corners of the glass.
Another possible reason is self-destruction. Self-explosion is an inherent defect of tempered glass. Because tempered glass contains a component called nickel sulphide, in the case of thermal expansion and contraction, the small particles will become larger and smaller, which does not match the size of the glass deformation. It may cause the internal stress of the glass to change drastically, resulting in self-explosion. This self-explosion probability is specified by most manufacturers in three thousandths.
The raw material for the production of tempered glass is quartz sand ore. Nickel sulphide is present in quartz sand ore. Although glass manufacturers will remove nickel sulphide as much as possible during the production process, it is impossible to completely remove nickel sulphide by the current domestic technology.
We know that after the tempered glass falls to the ground, it is broken into pieces of small glass enamel that are small in size. The reason why tempered glass is called safety glass is because the tempered glass after cracking has no sharp angle. In order to ensure that these shreds are as injurious as possible, the national standard "Safety Glass for Buildings and Tempered Glass" (GB15763.2-2005), which was implemented on March 1, 2006, is the state of shattered after tempered glass. It is clearly stated that the plane tempered glass of 4-12mm thickness shall not be less than 40 pieces in any 50mm×50mm area.
One of the solutions: semi-tempered glass
Tempered glass appeared earlier in the 1930s and 1940s in the last century. China was introduced in the 1990s. In particular, in 2003, the four ministries and commissions issued the "Regulations on the Administration of Building Safety Glass", which required the use of tempered glass for curtain wall glass, and tempered glass in China. More and more places to use.
However, the self-explosion phenomenon of tempered glass has not been solved since its inception, and self-explosion is therefore called cancer of tempered glass. In fact, in recent years, there has been controversy in the domestic use of tempered glass for curtain wall glass. Some said that after the tempered glass is broken, the particles are small and safer. However, there are also many experts who have called for the use of semi-tempered glass with a lower self-explosion rate.
When the surface stress of the glass is greater than 70 N/mm 2 , self-explosion may occur. The greater the stress, the smaller the glass particles formed after the crushing. China stipulates that the tempered glass stress should be greater than 90N/mm2, the purpose is to pursue small particles to ensure safety. However, the stress is increased, which in turn greatly increases the self-explosion rate of the glass. In China, a self-explosion rate of 1% to 3% is generally considered acceptable. Although technical measures can be taken to reduce its self-explosion rate to one-thousandth, it is impossible to guarantee that it will not be self-destructive at all. Semi-tempered glass is also heat-strengthened glass, but the cooling rate after heating is low, and the surface stress is less than 70 N/mm2. Semi-tempered glass for curtain wall, surface stress 45N/mm2-54N/mm2. Even if accidentally broken, the cracks do not cross, and the formed radial cracks reach the edge. Because the edges are glued or framed, the glass fragments are not easy to fall.
"We do not intend to negate tempered glass. In some places, tempered glass must be used. For example, point-supported glass panels must use tempered glass and its products due to strength requirements. The problem of self-explosion can only be relegated to the second place. China is too large, curtain wall engineering Too many, the situation is ever-changing, can not be simply one sentence across the board. Some curtain wall components, such as glass beams and glass ribs of the support panel, using a single piece of tempered glass called safety glass is extremely dangerous, but ordinary "non-safety glass" The risk of float glass is still a little smaller. Practice has shown that it is unscientific to affirm the tempered glass as a whole, negating semi-tempered glass,†said the relevant experts.
The glass curtain wall design life is only 25 years?
According to the relevant standards of our country, the glass curtain wall structural parts are designed for a period of 25 years, and the silicone structural rubber used for bonding glass is also 25 years old. After 25 years, is it not usable? That is not necessarily the case. Now that our country has a curtain wall for more than 25 years, it is still intact. But the hidden dangers will definitely get higher and higher. What about these over-aged curtain walls? There is currently no saying.
The test standard is blank?
Tempered glass belongs to reprocessed glass products, and its safety is characterized by being broken into pulverized particles, and the particles have no acute angle. "The current testing standards only have specific testing standards for flat glass. For tempered glass, there are no clear testing standards and regulations. Now it is implemented on the principle of "who is responsible for who installs it."
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