There are eight levels of bullet resistance for bulletproof glass. These ratings are designated by the UL (Underwriter’s Laboratory) to determine the type of protection each level offers. They conduct extensive tests on bullet-resistant glass, which determines what kinds of firearms each can withstand.
The most basic protection comes with levels one and two where you’re protecting yourself from small caliber handguns all the way up to level eight glass that protects against assault weapons.
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