Polycarbonate plastic materials have a unique balance of useful features which include high temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering materials.
Polycarbonate is definitely a long-lasting material. Though it features considerable impact-resistance, it has a lower scratch-resistance and thus a hard coating is applied to polycarbonate eyeglasses lenses as well as polycarbonate exterior vehicle components. The characteristics relating to polycarbonate tend to be like those of polymethyl methacrylate (PMMA, acrylic), except polycarbonate is definitely stronger, it is usable in a wider temperature range and is a bit more expensive. This plastic polymer is highly transparent to visible light and has better light transmission characteristics than many kinds of glass.
Polycarbonate carries a glass transition temperature of approximately 150 °C (302 °F), so it softens gradually above this point and flows above about 300°C (572 °F). Tools need to be held at warm to high temperatures, generally above 80 °C (176 °F) to help with making strain- and stress-free products.
Unlike most thermoplastics, polycarbonate can undergo dramatic deformations without breaking. Because of this, it could be processed and formed  at room temperature using sheet metal techniques, for example forming bends on a brake. For even sharp angle bends having a tight radius, no heating is usually necessary. This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are crucial, which can't be produced from sheet metal. Keep in mind that PMMA/Plexiglas, that is similar in looks to polycarbonate, but is brittle and cannot be bent unless it is heated.
Polycarbonate is often found in eye protection, and also in other projectile-resistant see through applications that would normally be thought of as requiring the use of glass, but require greater impact-resistance. Many kinds of lenses are produced from polycarbonate, including automotive headlamp lenses, lighting lenses, sunglass/eyeglass lenses, swimming and SCUBA goggles, and safety glasses for use in sporting helmets/masks and police riot gear. Windscreens in small motorized vehicles are commonly made of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.
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