Covestro Makrolon Polycarbonate Flat Sheet are considered unbreakable

Polycarbonate plastic materials offer a balance of beneficial features including high temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering plastic materials.
Polycarbonate is a very durable material. Although it features greater impact-resistance, it has got reduced scratch-resistance and thus a hard coating could be applied to polycarbonate eye protection lenses and polycarbonate exterior vehicle equipment. The characteristics associated with polycarbonate are similar those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate definitely 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 it has better light transmission characteristics than most grades of glass.
Polycarbonate carries a glass transition temperature of approximately 150 °C (302 °F), consequently it softens slowly above this point and flows above about 300°C (572 °F). Tools ought to be held at higher temperatures, generally above 80 °C (176 °F) to help with making strain- and reduced stress products.
Unlike almost all other thermoplastics, polycarbonate can undergo massive shape changes without cracking. For that reason, it may be processed and formed   without needing to be heated using 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 valuable in prototyping applications where transparent or electrically non-conductive parts are necessary, which can not be crafted from sheet metal. Note that PMMA/Plexiglas, that is similar in appearance 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 see through applications that would normally indicate the use of glass, but require much higher impact-resistance. Many different types of lenses are manufactured from polycarbonate, including automotive headlamp lenses, lighting lenses, sunglass/eyeglass lenses, swimming and SCUBA goggles, and safety visors for use in sporting helmets/masks and police riot gear. Windscreens in small motorized vehicles are commonly made of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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