Materials in the form of films, sheets, blocks, rods, tubes, pipes, shaped sections and shaped parts, all made wholly or principally of non-metallic materials and all for use in manufacture; articles made wholly or principally from the aforesaid goods; gaskets; articles made wholly or principally of plastics and metal (the plastics predominating); parts and fittings for all the aforesaid goods; seals; packing, stopping and insulating materials; electric insulators; thermoplastic extruded profiles for use in lining tanks and pipes; all included in Class 17.;