Bayer Makrolon Polycarbonate Flat Sheet are considered unbreakable

Polycarbonate products give you a great blend of beneficial features which include temperature resistance, impact resistance and optical properties position polycarbonates between commodity plastic materials and engineering materials.
Polycarbonate is a very high quality material. Even though it has very high impact-resistance, it possesses minimal scratch-resistance and so a hard coating typically is applied to polycarbonate eyewear and polycarbonate exterior vehicle equipment. The properties of polycarbonate tend to be like those of common Acrylic materials, yet , 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 has better light transmission characteristics than most grades of glass.
Polycarbonate carries a glass transition temperature of around 150 °C (302 °F), therefore it softens slowly above this point and flows above about 300°C (572 °F). Tools must be held at higher temperatures, generally above 80 °C (176 °F) to help make strain- and almost stress free products.
Unlike almost all other thermoplastics, polycarbonate can undergo massive deformations without cracking or breaking. Because of this, it may be processed and formed   without needing to be heated using sheet metal techniques, such as forming bends with a brake. For even sharp angle bends having a tight radius, no heating is generally necessary. This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are important, which cannot be made from sheet metal. Please keep in mind PMMA/Plexiglas, which happens to be similar in appearance to polycarbonate, but is brittle and cannot be bent with out a heating process.
Polycarbonate is often found in eye protection, in addition to other projectile-resistant viewing and lighting applications that would normally require the use of glass, but require 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 normally made out of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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