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[–] GOMAD_OR_GFYAD 0 points 1 point (+1|-0) ago 

You're thinking of safety glass. Tempering makes glass stronger and is one of the methods used in creating safety glass

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[–] dontmindthemess 0 points 2 points (+2|-0) ago 

Annealed glass is non-tempered glass. Tempering heat strengthens the glass, but causes it to shatter when chipped.