Sheffield Plastics Polycarbonate Flat Sheet are considered unbreakable

Polycarbonate plastic materials give you a great blend of useful features which include temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastics and engineering materials.
Polycarbonate is definitely a durable material. Even though it has increased impact-resistance, it possesses minimal scratch-resistance and so a hard coating may be applied to polycarbonate eyewear lenses as well as polycarbonate exterior automotive components. The characteristics of polycarbonate tend to be along the lines of those of polymethyl methacrylate (PMMA, acrylic), and yet polycarbonate is actually 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 approximately 150 °C (302 °F), consequently it softens slowly above this point and flows above about 300°C (572 °F). Tools will have to be held at higher temperatures, generally above 80 °C (176 °F) in order to make strain- and reduced stress products.
Unlike most other thermoplastics, polycarbonate can undergo large changes in basic shape without cracking or breaking. Hence, it could be processed and formed   at room temperature 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 attractive prototyping applications where transparent or electrically non-conductive parts are required, which cannot be crafted from sheet metal. Be aware that PMMA/Plexiglas, which is similar in looks to polycarbonate, but it is brittle and cannot be bent with out a heating process.
Polycarbonate is frequently used in eye protection, as well as in other projectile-resistant see through or lighting applications that would normally require the use of glass, but require much higher impact-resistance. Many kinds of lenses are created from polycarbonate, including automotive headlamp lenses, lighting lenses, sunglass/eyeglass lenses, swimming and SCUBA goggles, and safety visors for use in sporting helmets/masks and police riot gear. Windscreens in small motorized vehicles are typically made of polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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