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I would like to know what are the norms and standards for the strength of tempered glass in the United States? Thanks in advance.
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Tempered glass is a safety glass therefore it must meet the requirements of ANSI Z97 standard and Federal Standard CPSC 16 CFR 1201 and also state and local codes.
The Federal Specification DD-G-1403B requires a compression of 10.000 psi or more and compression on the edge of 9.700 psi.
I would suggest you to take a deeper look in these standards.
Maybe these two links will give you additional help:
http://www.glazingcodes.org/
http://www.sgcc.org/