Bayer Makrolon Polycarbonate Flat Sheet are considered unbreakable

Makrolon Polycarbonate materials give you a unique balance of beneficial features this includes high temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastic materials and engineering plastics.
Polycarbonate is a very long-lasting material. Although it features exceptional impact-resistance, it has got minimal scratch-resistance and thus a hard coating can be applied to polycarbonate eye protection and polycarbonate exterior automotive components. The characteristics associated with polycarbonate are similar to that of those of common Acrylic materials, except 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 it has better light transmission characteristics than several types of glass.
Polycarbonate carries a glass transition temperature near 150 °C (302 °F), therefore it softens slowly above this point and flows above about 300°C (572 °F). Tools are required to be held at high temperatures, generally above 80 °C (176 °F) to make strain- and reduced stress products.
Unlike many thermoplastics, polycarbonate can undergo massive changes in basic shape without cracking. Hence, it can be processed and formed   at room temperature using sheet metal techniques, such as forming bends on a brake. For even sharp angle bends having a tight radius, no heating is usually necessary. This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are needed, which can't be produced from sheet metal. Note that PMMA/Plexiglas, that is certainly similar in looks to polycarbonate, but it's brittle and cannot be bent with out a heating process.
Polycarbonate is commonly utilized in eye protection, in addition to other projectile-resistant viewing and lighting applications that would normally require the use of glass, but require much higher impact-resistance. Several types of lenses are made of 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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