Lexan Polycarbonate Sheets are clear and tough

Makrolon Polycarbonate materials have a great blend of useful features including temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering plastics.
Polycarbonate is a very rugged material. Though it features extraordinary impact-resistance, it’s got minimal scratch-resistance and thus a hard coating typically is applied to polycarbonate eye wear lenses and polycarbonate exterior automobile equipment. The properties relating to polycarbonate are generally along the lines of those of Acrylic PMMA materials, but polycarbonate is going to be 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 near 150 °C (302 °F), so it softens gradually above this point and flows above about 300°C (572 °F). Tools should be held at high temperatures, generally above 80 °C (176 °F) in order to make strain- and reduced stress products.
Unlike most thermoplastics, polycarbonate can undergo dramatic changes in basic shape without breaking or cracking. Therefore, for small changes in shape, it can be processed and formed   without needing to be heated using sheet metal techniques, for instance forming bends with a brake. For even sharp angle bends having a tight radius, no heating is generally necessary. This makes it attractive prototyping applications where transparent or electrically non-conductive parts are crucial, which can not be crafted from sheet metal. Note that PMMA/Plexiglas, which happens to be similar in looks to polycarbonate, but it is brittle and cannot be bent with out a heating process.
Polycarbonate is commonly used in eye protection, along with other projectile-resistant see through applications that would normally be thought of as requiring the use of glass, but require much greater impact-resistance. Several types of lenses are created from polycarbonate, including automotive headlamp lenses, lighting lenses, sunglass/eyeglass lenses, swimming and SCUBA goggles, and safety goggles for use in sporting helmets/masks and police riot gear. Windscreens in small motorized vehicles are typically produced from polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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