17 plastics in the form of sheets, films, blocks, rods and tubes for use in manufacturing, semi-processed plastics in the form of sheets, films, blocks, rods and tubes; plastic substances, semi-processed; flexible tubes of plastic, flexible plumbing pipes of plastic, flexible pipes and tubes of plastic for cooling ducts for use in industry and in public buildings; pipe fittings of plastic; pipe and tube connectors of plastic; pipe and tube couplings of plastic; pipe insulating materials of plastic; pipe and tube connections of plastic; pipe and tube connecting parts of plastic; pipe extensions of plastic being pipe couplings and flexible plastic pipes, plastic seals for flexible plastic pipe connections; pipe seals of plastic for pipe connections; thermally pre-insulated thermoplastic double pipes and moldings being semi-finished acrylic molded plastic, for use in transport of coolants; drywall joint compounds, sealant compositions being sealant compounds for joints; packing material for forming seals; waterproofing sheets and/or waterproofing film of plastic, other than for packaging, in the nature of waterproofing membranes for foundations of buildings and waterproofing membranes for foundations of buildings; film and sheets of plastic for lining containers, pipes, tanks and tunnels and for covering surfaces; linings for containers, sheets and films of plastic for lining containers, in particular for lining drinking water tanks; fasteners of plastic for fastening linings for containers, bands or profiles of plastic for fastening linings for containers, in particular for lining drinking water tanks; flexible pipes, not of metal, fittings being plastic profile bars; all the aforesaid goods of plastic; double pipe systems being systems for conveying air comprised of flexible plastic pipes and plastic pipe fittings; flexible pipes and fittings, not of metal, for pipes used as exhaust chimneys