Sheffield Plastics Polycarbonate Sheet are considered unbreakable

Polycarbonate plastic materials give you a unique balance of useful features including temp resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering materials.
Polycarbonate is a very durable material. Even though it features tremendous impact-resistance, it’s got lower scratch-resistance and thus a hard coating can be applied to polycarbonate eye protection lenses and polycarbonate exterior motor vehicle equipment. The properties associated with polycarbonate tend to be similar to that of those of common Acrylic materials, and yet polycarbonate definitely 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 different types of glass.
Polycarbonate carries a glass transition temperature of approximately 150 °C (302 °F), consequently it softens gradually above this point and flows above about 300°C (572 °F). Tools should be held at high temperatures, generally above 80 °C (176 °F) to make strain- and almost stress free products.
Unlike most other thermoplastics, polycarbonate can undergo massive shape changes without breaking or cracking. Therefore, it could be processed and formed   without needing to be heated using standard sheet metal techniques, which include forming bends on a brake. Even for 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 important, which may not be crafted from sheet metal. Keep in mind that PMMA/Plexiglas, that is certainly similar in looks to polycarbonate, but it is brittle and can’t be bent without heating.
Polycarbonate is frequently utilized in eye protection, as well as in 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. 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 commonly made up of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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