Insulating materials; films, sheets and rods of plastics in extruded form for use in manufacture; foam board, namely, foam insulation sheeting for industrial purposes; caulking compounds; packing materials of rubber or plastic or for use as insulating materials; extruded plastics in the nature of semi-finished products, namely, bars, blocks, pellets, rods, sheets and tubes for use in manufacturing; elastomer polymers, namely, semi-processed polymers in granule form; semi-worked polymer resins...