So called unbreakable glass is called "Pyrex" and it can withstand considerably more shock than regular glass, but like everything else, apply enough force and it will meet its failure threshold.
Pot_Duster Reviewed by Pot_Duster on . Unbreakable glass My bowl is supposedly made of "unbreakable glass". The owner of the shop I bought it from threw it across the room before I bought it to prove it to me. It doesn't crack or anything if you drop it on a hard floor but I would like to know how far the strength of the glass goes. Has anyone ever broken an "unbreakable" glass piece? I'd like to know the threshold for this type of glass. Rating: 5