17 Plastic semi-worked products, namely, semi-worked synthetic plastic as semi-finished products in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, films, sheets and fibers; plastic semi-worked products, namely, semi-worked synthetic resins as semi-finished products in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, films, sheets and fibers; heat insulating materials of synthetic plastic as semi-finished products in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, film, sheets and fibers; heat insulating materials of synthetic resins as semi-finished products in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, film, sheets and fibers; heat insulating materials of synthetic plastic as building parts in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, films, sheets and fibers; heat insulating materials of synthetic resins as building parts in the form of pellets, beads, rods, bars, pipes, tubes, boards, plates, sponges, foams, tapes, strips, foils, films, sheets and fibers