How to Determine if You Have Impact-Resistant Glass

Look for a permanent mark in one of the four corners of the glass. This mark may include the supplier's name, place of fabrication, date of manufacture, thickness and any certifications or safety standards the glass meets.

Check the glass for a temporary label. While sheets of impact-resistant glass typically carry a mark on all four corners, the glass may have been cut in a way that excludes the mark. The manufacturer may affix a removable label that states the type of glass along with the information above.

Examine a reflection in the glass. If you don't find any markings or labels on the glass, hold your hand or an object up to the glass and carefully study the reflection. Because laminated glass consists of two sheets of glass, you should see two different reflections.