Lexan Polycarbonate Flat Sheet are clear and tough

Polycarbonate materials offer a unique balance of useful features including temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering plastic materials.
Polycarbonate is definitely a rugged material. Whilst it offers outstanding impact-resistance, it has got minimal scratch-resistance and so a hard coating can be applied to polycarbonate eyeglasses lenses and polycarbonate exterior vehicle equipment. The properties associated with polycarbonate are generally similar those of polymethyl methacrylate (PMMA, acrylic), although polycarbonate is 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 different types of glass.
Polycarbonate has a glass transition temperature of about 150 °C (302 °F), as a result it softens slowly 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) for making strain- and almost stress free products.
Unlike most other thermoplastics, polycarbonate can undergo massive deformations without cracking. Therefore, it can be processed and formed   cold using standard sheet metal techniques, such as forming bends with a brake. Even for sharp angle bends with a tight radius, no heating is generally necessary. This makes it attractive prototyping applications where transparent or electrically non-conductive parts are important, which can not be made from sheet metal. Remember that PMMA/Plexiglas, which is similar in appearance to polycarbonate, but it's brittle and can't be bent with out a heating process.
Polycarbonate is commonly found in eye protection, along with other projectile-resistant viewing and lighting applications that would normally indicate the use of glass, but require much higher impact-resistance. Several types of lenses are manufactured 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 typically crafted from polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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