Polycarbonate Security Glazing
While not actual glass, polycarbonate security glass is optimal for exterior windows because of its resistance to forced entry. However, it has poor light transmission. A sheet of polycarbonate will withstand repeated strikes from a sledgehammer where its acrylic counterpart cannot. Polycarbonate can be coated with an abrasion-resistant layer which affords it increased protection from solvents, weather, and UV light.
Level 1 polycarbonate security glass is able to withstand shots from small caliber handguns, most commonly used in armed robberies. Most small businesses use Level 1 bullet-resistant glazing as a crime deterrent. This material is commonly found in places like Gas Stations, Retail Stores and Pharmacies.