Tempered glass is safety glass because it breaks into small cubes. The edges of these cubes are still sharp. They are not “rounded”. From a glass expert point of view, the safety aspect comes strictly from the small size, which is a function of the temper stress. If these pieces are interlocked, they can behave in a manner similar to a larger piece broken from an annealed piece of glass.
Materials Failure Analysis and Process Engineering
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