How do you know if glass is tempered?

[Kayleb]

Originally Posted by kuatto

the only glasses I have are for my laser level,they're deep red to protect against the laser.I guess I'll just try cutting a broken piece.

Jim

If there is a broken piece it can't be tempered, because when temp glass breaks the entire piece shatters into 1000's of small pieces. And the same happens when you try to cut it. I had a large piece of temp glass from an
old sliding glass door, seemed a waste to toss it so I tryed to cut it, one thing good is it went into the garbage pail a little easier after I swept up
all the pieces.