Sheffield Plastics Polycarbonate Flat Sheet are considered unbreakable

Makrolon Polycarbonate products give you a unique balance of useful features which include temp resistance, impact resistance and optical properties position polycarbonates in between commodity plastic materials and engineering materials.
Polycarbonate is definitely a tough material. Though it offers very high impact-resistance, it has low scratch-resistance and thus a hard coating is often applied to polycarbonate eyewear lenses as well as polycarbonate exterior automobile components. The properties associated with polycarbonate are generally comparable to those of common Acrylic materials, except 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 many kinds of glass.
Polycarbonate carries a glass transition temperature of around 150 °C (302 °F), so it softens slowly above this point and flows above about 300°C (572 °F). Tools should be held at higher temperatures, generally above 80 °C (176 °F) to make strain- and reduced stress products.
Unlike many thermoplastics, polycarbonate can undergo large shape changes without breaking or cracking. Due to this fact, for small changes in shape, it can be processed and formed   without needing to be heated using standard sheet metal techniques, which include forming bends on a brake. For even sharp angle bends with a tight radius, no heating is generally necessary. This makes it attractive prototyping applications where transparent or electrically non-conductive parts are essential, which can not be created from sheet metal. Be aware that PMMA/Plexiglas, which is similar in looks to polycarbonate, but it is brittle and can't be bent at room temperature.
Polycarbonate is commonly utilized in eye protection, along with other projectile-resistant viewing and lighting applications that would normally be thought of as requiring the use of glass, but require much greater impact-resistance. Several types of lenses are produced 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 of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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