Polycarbonate (PC)

Polycarbonate (PC), a thermoplastic like polyolefins (PE), belongs to the amorphous engineering thermoplastics and is chemically classified as a polyester. The most important aromatic polycarbonates are produced by polycondensation of bisphenol A and phosgene. This polymer is characterized by a combination of high transparency, excellent heat resistance, and outstanding impact strength. It also has medium to high strength and stiffness, a high creep modulus, and good dimensional stability. Polycarbonate is often used as a substitute for glass, for example in automotive headlights, aircraft windows, and eyeglass lenses. Compared to glass, polycarbonate is much lighter and more impact-resistant, with less splintering upon breakage, thus reducing the risk of injury. However, polycarbonate has lower abrasion resistance and resistance to chemicals and sunlight than glass, which is why it is often coated with a protective lacquer when used as a glass substitute.