17 Semi-processed artificial resins, namely, polymeric resins in the form of sheets, plates, bullets, blocks, bands and fibers, namely, polyethylene, polystyrene, polypropylene, acrylo betadiene styrene, styrene acrylo nitro; synthetic rubber in the form of sheets, blocks, bullets, plates and fibers for use in the manufacture of plastic molding compounds, for use in plastic extrusion and for general industrial uses; plastic fibers and polymeric resins for use in the manufacture of plastic molding compounds, for use in plastic extrusion operations and for general industrial use; electric, thermic or acoustic insulating materials, namely, electrical insulating tape, building insulation, acoustical insulation barrier panels, insulating covers for industrial machinery, insulation for aircraft, insulation for underground pipes and tanks, insulation for underground pipes and tanks, insulation for use in construction, insulation jackets for industrial pipes, and insulating oils for transformers; semi-processed plastics in the form of sheets, plates, bullets, blocks, bands and fibers for use in the manufacture of plastic molding compounds, for use in plastic extrusion operations and for general industrial use; artificial polymeric fibers for use in concrete and bitumen