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What's the most effective method to solve the Self-explosion of Tempered Glass?

Author:Jacqueline Jin Click: Time:2021-05-17 19:41:55 From:Originally

What's the most effective method to solve the Self-explosion of Tempered Glass?


What's self-explosion of tempered glass?


Tempered glass has an inherent defect "self-explosion" - the phenomenon of tempered glass automatically breaking without external direct action. Tempered glass blast can occur in the process of tempering processing, storage, transportation, installation and use. There are two types of self-explosion: one is self-explosion caused by visible defects in the glass, such as stones, sand, bubbles, inclusions, notches, scratches, chipping, etc.; the second is the colorless transparent nickel sulfide in the glass ( NiS) Self-explosion caused by impurity expansion. Modern float glass production technology cannot completely eliminate the presence of nickel sulfide (NiS) impurities, so tempering and self-explosion is inevitable, which is an inherent characteristic of tempered glass. At present, there is no national standard in the world to limit the self-explosion of tempered glass. According to the experience of the Chinese glass industry, the self-explosion rate of ordinary tempered glass is about 3~5‰. The methods for solving the self-explosion of tempered glass generally include the following: 1. Reasonable design to avoid the size of the monolithic glass is too large and the structure is super thick; 2. The stress value of the tempered glass is appropriately reduced (the domestic manufacturer generally sets the surface tension of the tempered glass to 100 MPa). Left and right), use the selected tempering equipment, reasonable operation, reduce the uneven distribution of stress; 3, use excellent grade float glass or ultra-white glass, because ultra-white glass in production, a magnetic dressing process more than ordinary glass, can Further reduce the iron and nickel impurities in the raw materials. The self-explosion rate of ultra-white glass is generally only about one-tenth of a thousand; 4. The tempered glass used in important projects and important parts should be hot-dipped.



Hot dip treatment HST


Hot dip treatment is also called homogenization treatment, commonly known as ‘detonation’. The hot dip treatment is to heat the tempered glass to 290 ° C &plus mn; 10 ° C, and keep it for a certain period of time, so that the nickel sulphide can quickly complete the crystal phase transformation in the tempered glass, so that the tempered glass that could be self-explosive after the original use is artificially broken in advance in the factory. In the hot dip furnace, thereby reducing the self-explosion of the tempered glass in use after installation. This method generally uses hot air as a heating medium, which is called ‘HeatSoakTest’ in foreign countries, referred to as HST, and is literally translated as hot dip.

In principle, hot dip treatment is neither complicated nor difficult. But actually achieving this process is very difficult. Studies have shown that there are many specific chemical structural formulas of nickel sulfide in glass, such as Ni7S6, iS, NiS1.01, etc., not only the proportion of various components are different, but also may be doped with other elements. The phase change speed is highly dependent on the temperature. Studies have shown that the phase transition rate at 280 ° C is 100 times that at 250 ° C, so it must be ensured that each piece of glass in the furnace experiences the same temperature regime. Otherwise, on the one hand, the glass with low temperature is not enough for the holding time, and the nickel sulfide cannot completely change phase, which reduces the effect of hot dip. On the other hand, when the glass temperature is too high, it may even cause reverse phase transformation of the nickel sulfide, causing a greater hidden danger. Both of these conditions can cause hot dip treatment to be laborious and even counterproductive. The uniformity of temperature during hot-dip furnace operation is so important, and the temperature difference in the furnace of most domestic hot-dip furnaces is even 60 °C during hot-dip insulation. It is not uncommon for foreign imported furnaces to have a temperature difference of about 30 °C. Therefore, although some tempered glass is treated by hot dip, the self-explosion rate is still high.



In general, most normal tempered glass can meet most of the standard requirements of windows&doors, while some area requires higher standard for the low rate of self-explosion and high strength of glass, Hot dip treatment for glass can be as options for your reference.


If you want to know more about how to choose glass for your windows&doors to meet your different requirements, such as energy saving windows, privacy protection, stylish, etc., pls don't hesitate to contact us to discuss about all those requirements for windows&doors for your house or properties.


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