Covestro Makrolon Polycarbonate Sheets are considered unbreakable

Polycarbonate plastic materials offer a balance of beneficial features including temp resistance, impact resistance and optical properties position polycarbonates between commodity plastic materials and engineering plastic materials.
Polycarbonate is a very rugged material. Even though it offers very high impact-resistance, it possesses low scratch-resistance and thus a hard coating can be applied to polycarbonate eyeglasses and polycarbonate exterior motor vehicle components. The characteristics associated with polycarbonate are like 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 most grades of glass.
Polycarbonate carries a glass transition temperature of approximately 150 °C (302 °F), in order that it softens gradually 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) to make strain- and reduced stress products.
Unlike most other thermoplastics, polycarbonate can undergo dramatic shape changes without breaking or cracking. Hence, it can be processed and formed   without needing to be heated using sheet metal techniques, which include forming bends on a brake. Even for sharp angle bends with a tight radius, no heating is usually necessary. This makes it useful for prototyping applications where transparent or electrically non-conductive parts are required, which cannot be crafted from sheet metal. Note that PMMA/Plexiglas, that is certainly similar in appearance to polycarbonate, but it's brittle and can't be bent with out a heating process.
Polycarbonate is often found in eye protection, as well as in other projectile-resistant see through or lighting applications that would normally be thought of as requiring the use of glass, but require much higher impact-resistance. Many different 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 made up of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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