"Colbyt" wrote in message

The reality is almost no glass tabletop is tempered. They are just thick
glass.

I learned that one the hard way when we dropped a bowl from a height of
about 6" to the tabletop.

Could be. I found this place
http://www.glasstopsdirect.com/glass-round-54.php
They state the 3/8" top is tempered. I'd then assume the thicker ones are
not. If broken a 3/4" thick section is less likely to slice through your
gut than a thin one.