19 BUILDING PRODUCTS MADE OF PLASTIC-NAMELY, ROOFING MATERIAL, SEALING SHEETS, PASTES FOR SEALING SEAMS, PRIMERS FOR SEALING AND COVERING TAPE ON CONCRETE, PLASTER, WOOD, POLYESTER AND METAL, WELDING AGENTS FOR ROOF AND SEALING SHEETS, PLATES, FOILS, TUBES, PIPES, PROFILES, BARS AND ROLLS