Identification of causes of tempered glass self-explosion

The self-explosion of steel glass has a lot to do with external influences, weather, improper installation, or itself. The self-explosion of steel glass is closely related to the influence of external force. After the glass is heated, the heat will be distributed unevenly. At this time, the glass will be affected and cause self-explosion.
If the installation gap is relatively small during installation, or the tempered glass is in direct close contact with the frame, due to the different expansion coefficients of different materials, when temperature changes, it is easy to cause extrusion deformation between the glass and the frame, causing the tempered glass to break.
In the case of identification of the cause of self-explosion of tempered glass, Zhongke Testing can provide identification services of the cause of self-explosion of tempered glass.

Tempered glass self-explosion may occur during tempering processing, storage, transportation, installation, use, etc. Self-explosion can be divided into two types according to different causes:
The first is self-explosion caused by visible defects in the glass, such as stones, sand, bubbles, inclusions, gaps, scratches, edge explosions, etc.;
The second is self-explosion caused by the expansion of nickel sulfide (NiS) impurities in the glass.

GB15763.2-2005 Safety glass for construction Part 2: Tempered glass
GB15763.3-2009 Safety glass for construction Part 3: Laminated glass
GB15763.4-2009 Safety glass for construction Part 4: Homogeneous tempered glass
GB 11614-2009 Flat glass

When a company's office was built, a large area of glass curtain wall was used. However, after completion, the tempered glass began to crack. As a result, the company approached the glass supply factory and asked them to compensate for maintenance. However, the glass supplier believes that the cracked tempered glass has nothing to do with the quality. It may be an installation problem, or it may be caused by the noise caused by the large number of factories near the company.
As a result, the company took the tempered glass factory to court. The court immediately entrusted our company to conduct quality appraisal on this batch of tempered glass. The
quality analysis expert team visited the site and inspected the surrounding environment. At the same time, samples were taken and returned to the laboratory for composition analysis, impact resistance, pressure and other tests.
has undergone analysis and testing and found that there is no problem with the installation of this batch of tempered glass, and there are no signs of external impact on the surface.
However, abnormal spots were found in the center of the broken radial shape. After electron microscopy energy spectrum analysis, it was found that the impurities contained nickel sulfide impurities.
These nickel sulfides are the main reason why tempered glass explodes.