"Norminn" wrote in message
hlink.net...
it is supported by wood. Perhaps the thick plate can't be tempered?

any thickness over 1/16" can be tempered. 1/8" tempered glass is use for
stormdoors and some tempered residential windows depending on the necessity.
store front glass in frames in 1/4" glass and again depending on the
location or other factors is either tempered or laminated. safety glass is
standard in all residential or commercial doors. patio doors are tempered
safety glass.....except very old doors that were made before the code was
changed for new installation and replacement glass.


We had glass cut to use as backsplash behind our cooktop. After
cutting, the shop sent it back to the factory to be tempered.

that's only for the heat resistant qualities from tempered glass. regular
plate glass can be heat sensitive, but once it is tempered, it can withstand
higher heat ranges, but it shouldn't be cooled rapidly, it could cause it to
break.

mike............