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Re: [APD] Glass myths
I also found some hard numbers:
http://www.alumaxbath.com/tech/tgp.htm
"Heat-treated glasses are classified as either fully tempered or heat
strengthened. According to Federal Specification DD-G-1403B, fully
tempered glass must have a surface compression of 10,000 psi or more or
an edge compression of 9,700 psi or more. Heat-strength glass must have
a surface compression between 3,500 and 10,000 psi, or an edge
compression between 5,500 and 9,700 psi. The fracture characteristics of
heat- strengthened glass vary widely from very much like annealed glass
near the 3,500 psi level to similar to fully tempered glass at the
10,000 psi level."
--
Jerry Baker
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