How to identify the tempered glass is blew?

How to identify whether the steel is blew, first look at the burst point (tempered glass cracks were radial, have the starting point) whether in the middle of the glass, such as the edge of the glass, generally because the glass has not been chamfered grinding or glass edge damage, Resulting in stress concentration, the gradual development of cracks caused by; such as the starting point in the middle of the glass, look at whether there are two small pieces of polygons composed of two similar butterfly wings-like pattern (Hu Dieban), if careful observation of two small polygons Side (butterfly's trunk part) should be visible black small particles (nickel sulfide stones), you can determine the blew; otherwise it should be destroyed by external forces. The typical characteristics of the glass blew is the butterfly spot. Glass fragments were radial distribution, the radiation center has two pieces of butterfly wings like glass blocks, commonly known as "butterfly spot." Stone is located in the two "Hu Dieban" interface. At present, the domestic glass manufacturers of the blasting rate is not consistent, ranging from 3% to 0.3%, the current technology is still inevitable.
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