Visor made of polycarbonate, 1975.
© Science Museum / Science & Society Picture Library
Polycarbonates are a clas of polymers that are very stiff and strong but not brittle. These characteristics, coupled with the fact that polycarbonates are transparent, makes them ideally suited for making shatterproof items such as visors. Other application of these plastics are in street lighting, protective windows, and as the surface on which information is stored on compact discs. Made by Stadium Ltd.