plastics in extruded, molded or calendared form for use in manufacture; rubber and plastic pipes and hoses for use in manufacture; slabs made of rubber and plastic for use in manufacture; rubber gaskets and seals for use in manufacture; packing, stopping, insulating and soundproofing materials, namely, rubber and plastic sound absorbing seals for use by the automotive, building and petrochemical industries; plastic insulating coatings for use in manufacture; plastic packing seals for use in vacuum packing processes; joint coverings and moldings, namely, drywall joint-tape and jointing material for masonry and pavement