Sheffield Plastics Polycarbonate Flat Sheet are considered unbreakable
Makrolon Polycarbonate products have a unique balance of beneficial features including temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastic materials and engineering plastic materials.
Polycarbonate is a very tough material. Though it features significant impact-resistance, it's got low scratch-resistance and thus a hard coating can be applied to polycarbonate eyeglasses as well as polycarbonate exterior auto components. The characteristics associated with polycarbonate are generally similar to those of polymethyl methacrylate (PMMA, acrylic), but polycarbonate is always 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 many different types 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 will have to be held at high temperatures, generally above 80 °C (176 °F) in order to make strain- and stress-free products.
Unlike most thermoplastics, polycarbonate can undergo large shape changes without cracking. For this reason, it may be processed and formed without needing to be heated using sheet metal techniques, for example forming bends on a brake. Even for sharp angle bends having a tight radius, no heating is generally necessary. This makes it useful for prototyping applications where transparent or electrically non-conductive parts are crucial, which cannot be produced from sheet metal. Understand that PMMA/Plexiglas, which happens to be similar in looks to polycarbonate, but it is brittle and can't be bent without heating.
Polycarbonate is often found in eye protection, in addition to other projectile-resistant optical type applications that would normally indicate the use of glass, but require much higher impact-resistance. Many different 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 made out of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.
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