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Summary of advantages: Increased security for the service hall; and when a shock or a succession of them manage to break the outer layer of tempered glass, it breaks into shards of glass bit sharp, so there is less risk of cutting to the users. Savings in the budget of replenishment: the tempered glass can be up to 5 times more resistant than an item that has not been subjected to this treatment. The products hardened resist differences in temperature of 135°C: this allows to pass out of the furnace (or iron) to the cold water without risk of breakage