Lexan Polycarbonate Sheet are clear and tough

Polycarbonate materials give you a unique balance of beneficial features which include high temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastics and engineering plastics.
Polycarbonate is definitely a high quality material. Whilst it has higher impact-resistance, it's got minimal scratch-resistance and so a hard coating can be applied to polycarbonate eyeglasses and polycarbonate exterior automotive equipment. The properties of polycarbonate are along the lines of those of common Acrylic materials, and yet 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 different types of glass.
Polycarbonate carries a glass transition temperature near 150 °C (302 °F), in order that it softens slowly above this point and flows above about 300°C (572 °F). Tools will have to be held at higher temperatures, generally above 80 °C (176 °F) for making strain- and almost stress free products.
Unlike almost all other thermoplastics, polycarbonate can undergo massive shape changes without breaking or cracking. As a result, it is sometimes processed and formed   at room temperature using standard sheet metal techniques, which include forming bends with a brake. Even for sharp angle bends with a tight radius, no heating is generally necessary. This makes it useful for prototyping applications where transparent or electrically non-conductive parts are crucial, which can not be made from sheet metal. Be aware that PMMA/Plexiglas, which happens to be similar in looks to polycarbonate, but it is brittle and cannot be bent at room temperature.
Polycarbonate is often used in eye protection, in addition to other projectile-resistant see through or lighting applications that would normally indicate the use of glass, but require much greater impact-resistance. Many kinds 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 normally constructed from polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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