Sheffield Plastics Polycarbonate Sheets are considered unbreakable

Bayer Makrolon Polycarbonate products have a balance of useful features this includes temp resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering plastics.
Polycarbonate is definitely a rugged material. Whilst it has tremendous impact-resistance, it has a lower scratch-resistance and thus a hard coating is applied to polycarbonate eye protection lenses and polycarbonate exterior vehicle components. The properties associated with polycarbonate are similar to that of those of polymethyl methacrylate (PMMA, acrylic), although 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 kinds of glass.
Polycarbonate has a glass transition temperature of approximately 150 °C (302 °F), in order that it softens slowly above this point and flows above about 300°C (572 °F). Tools are required to be held at warm to high temperatures, generally above 80 °C (176 °F) for making strain- and stress-free products.
Unlike most thermoplastics, polycarbonate can undergo large shape changes without breaking. As a result, it may be processed and formed   cold using standard sheet metal techniques, which include forming bends with a brake. For even sharp angle bends having a tight radius, no heating is generally necessary. This makes it useful for prototyping applications where transparent or electrically non-conductive parts are necessary, which cannot be made from sheet metal. Keep in mind that PMMA/Plexiglas, that is similar in appearance to polycarbonate, but is brittle and can't be bent unless it is heated.
Polycarbonate is commonly utilized in eye protection, as well as in other projectile-resistant see through applications that would normally be thought of as requiring the use of glass, but require much higher impact-resistance. Many kinds of lenses are manufactured 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 made up of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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