| 摘要 |
The invention relates to a double ribbed plate or a multi-layered ribbed plate made of polycarbonate having a thickness of more than 10 mm and at least one additional layer made of polycarbonate applied to one flange surface. According to the invention, said surface comprises a thickness of 5 - 150 µm. The invention is characterised in that the ribbed plate contains a colouring pigment in a powdery and inorganic form in a concentration of 5 - 70 wt. %. |
