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Why can't the tempered glass be processed

Toughened glass is can fast cooling after tempering furnace heated to a certain extent, toughened glass than the original hardness after processing will be four to five times, and its broken after is small granular, won't cause harm to other things, the average of toughened glass before cutting, edge grinding, drilling and other processing, rather than after toughened, so why not for toughened glass processing.

After the glass is tempered, the internal stress in the glass is dispersed uniformly and balanced. It is the balanced and uniform internal stress that makes the tempered glass stronger

Some drilling or other processing on the glass will break the balance of internal stress of the tempered glass, and the glass will immediately break into small particles, so the tempered glass is not

It can be processed again, usually before the steel is finished.