Covestro Makrolon Polycarbonate Sheet are considered unbreakable

Polycarbonate plastic materials have a balance of useful features including temperature resistance, impact resistance and optical properties position polycarbonates in between commodity plastic materials and engineering plastic materials.
Polycarbonate is a very durable material. Even though it features significant impact-resistance, it has low scratch-resistance and thus a hard coating is applied to polycarbonate eyewear lenses and polycarbonate exterior automotive equipment. The characteristics relating to polycarbonate tend to be like those of Acrylic PMMA materials, 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 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 gradually above this point and flows above about 300°C (572 °F). Tools will have to be held at warm to high temperatures, generally above 80 °C (176 °F) to help make strain- and almost stress free products.
Unlike most thermoplastics, polycarbonate can undergo dramatic changes in basic shape without cracking or breaking. Subsequently, it can be processed and formed   cold using sheet metal techniques, for instance forming bends with a brake. Even for sharp angle bends with a tight radius, no heating is usually necessary. This makes it attractive prototyping applications where transparent or electrically non-conductive parts are needed, which can't be created from sheet metal. Remember that PMMA/Plexiglas, which happens to be similar in looks to polycarbonate, but it's brittle and can't be bent at room temperature.
Polycarbonate is frequently used in eye protection, along with other projectile-resistant see through applications that would normally require the use of glass, but require much higher impact-resistance. Many different types of lenses are produced from 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 crafted from polycarbonate, such as for motorcycles, ATVs, golf carts, and small planes and helicopters.

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