Made from extremely fine glass fibers, fiberglass is used as a reinforcing agent for many polymer products. The resulting composite material is properly known as glass-reinforced plastic (GRP) in Britain, fiber-reinforced plastic (FRP) in the USA, or by the trade name Fiberglass, which has become a genericized trademark.
Polycarbonate is the most impact-resistant clear sheet available today. Virtually unbreakable, it is approximately 250 times stronger than plate glass and thirty times stronger than acrylic of equal thickness. Polycarbonate- sheet provides lasting protection against vandalism, burglary, and natural occurrences, such as high winds, snow loads, and hailstorms. It is unlikely to break, shatter, or chip when bombarded with thrown objects, such as rocks, bricks and bottles, nor is it likely that this material will break when hammered twisted or bent.