17 Semi-processed plastics in the nature of films, sheets, panels, plates, rolls, strips, straps, rods and tapes; filtering materials (semi-processed plastic materials); insulating materials; insulating films, sheets, panels, plates, rolls, strips, straps, rods and tapes; insulating fabrics; insulating coatings; waterproofing coatings made of plastic; water-proofing plastic; waterproof fabrics (not for textile use); sealing rings made of plastic; materials for waterproofing; packing, stopping and insulating materials