Housing made of plastic for protecting electrical components, couplings of plastic for pipes, couplings for plastics for tubes, extruded plastics, fabrics of plastic for insulation, flexible tubing of plastics, flexible plastic pipe insulation, identification sleeves of plastics for pipes, laminated plastic surface protection materials, pipe flanges of plastic, pipe end protectors made of plastic materials, plastic cables for strengthening optical fibre cables, plastic seals, plastic strands for strengthening optical fibre cables, plastics in extruded form for use in manufacturing meter boxes, plastics in extruded form for use in packing, plastic materials in sheet form for cable sheathing, preform sections of expanded plastics for supporting articles in storage and transit, as well as thermally insulated pipes and thermal insulating materials made of plastic