# How to Check for Tempered Glass
Tempered glass is commonly used as safety glass, as required by most building codes. Check for a mark etched or embossed on a corner edge of the window for easy identification. This mark is required by the International Building Code and must be applied in a permanent manner that resists removal or destruction. The tempering process also leaves marks on the glass; some are visible to the naked eye and some can only be seen through polarized glasses.
Things You'll Need
- Polarized glasses (optional)
Instructions
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1
Examine the edges at each corner of the glass to locate the mark or logo that contains the manufacturer and safety glazing codes such as IGCC (Insulating Glass Certification Council) or ANSI (American National Standards Institute). ANSI Z-97.1 is the identification code for safety glass.
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2
View the glass at an angle in reflected light. Rollers used in one type of tempering process leave a slightly wavy surface. Alternately, inspect the edge of the glass for tong marks, which are used instead of rollers in another tempering process.
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3
Look at the glass through the polarized glasses and at an angle for a checkered pattern that results from the tempering process. Move around a bit to change your viewing angle if the pattern is not visible at first.
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