Raw or semi-worked, rubber and gum; plastics in extruded form for use in manufacture; semiprocessed plastics in the nature of composites of plastic and other semi-finished products of plastic, also in the form of fluids, foams, films, sheets, membranes, plates or tubes; chemical fibre thread and and yarn not for textile use; plastic fibres not for textile use; packing, sealing and insulating materials; flexible pipes, not of metal; semi-processed insulating resins and semi-processed natural r...