Sealing and insulating materials; adhesive tapes, strips, bands and films other than stationery and not for medical or household purposes; plastic seals; adhesive-coated plastic sheets for use in manufacture; insulating tapes; insulating materials produced from plastics; insulation and barrier articles and materials; foils of plastics [semi-finished products]; plastic rods and bars; plastics materials in the form of plates [semi-finished products]; semi-worked plastic substances