1.1 This International Standard specifies the requirements for flat extruded sheets of polycarbonate (PC) for general applications. It applies specifically to sheets made of poly(p,p'-isopropylidenediphenol) carbonates. The sheets may be coloured or colourless, and they may be transparent, translucent or opaque. The sheets may also have a special weather-protective coating on one or both surfaces. 1.2 This International Standard applies only to thicknesses equal to or greater than 1,5 mm.