Polycarbonate materials have a balance of helpful features this includes temp resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering materials.
Polycarbonate is a very rugged material. Though it offers greater impact-resistance, it possesses reduced scratch-resistance and thus a hard coating is often applied to polycarbonate eye protection as well as polycarbonate exterior motor vehicle components. The characteristics relating to polycarbonate are generally comparable to those of Acrylic PMMA materials, but 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 it has better light transmission characteristics than many different types of glass.
Polycarbonate has a glass transition temperature of about 150 °C (302 °F), so it softens gradually above this point and flows above about 300°C (572 °F). Tools are required to be held at high temperatures, generally above 80 °C (176 °F) in order to make strain- and almost stress free products.
Unlike most thermoplastics, polycarbonate can undergo dramatic deformations without breaking or cracking. As a result, for small changes in shape, it can be processed and formed  without needing to be heated using standard sheet metal techniques, for instance forming bends on a brake. Even for sharp angle bends with a tight radius, no heating is usually necessary. This makes it attractive prototyping applications where transparent or electrically non-conductive parts are crucial, which can not be produced from sheet metal. Please keep in mind PMMA/Plexiglas, which is similar in looks to polycarbonate, but is brittle and can't be bent unless it is heated.
Polycarbonate is often used in eye protection, and also in other projectile-resistant optical type applications that would normally require the use of glass, but require much higher impact-resistance. Many different types 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 manufactured from polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.
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