17 Plastic film for commercial and industrial use; [ fibers of plastics not for textile use for use in manufacturing; ] flexible pipes, not of metal; plastic semi-worked products, namely, films, [ sheets, tubes, bars, ] rods, [ fabrics for use in manufacturing, plastic sheeting for coatings or linings for guides, pistons and housings, ] laminates comprising plastics for use in manufacturing, composite material comprising plastics for use in manufacturing [, plastic sheaths for cables and wires]; non-metal seals for use in construction of machinery and apparatus, and construction of motors, engines and gears, except construction of motors, engines and gears for vehicles, of elastomer materials and/or of plastics, namely, [ cylinder head gaskets, rotary shaft seals, valve cover gaskets, valve stem sealings, oil seals, oil pan seals, intake manifold seals, ] water pump seals [, cylinder head cover seals, carburetor air filter sealings, cylinder head cap seals, camshaft carrier seals, ramming chamber seals, push rod space seals, valve shaft seals, O-rings and shaped rings; non-metal seals for use in construction of motors, engines and gears for vehicles, of elastomer materials and/or of plastics, namely, cylinder head gaskets, rotary shaft seals, valve cover gaskets, valve stem sealings, oil seals, oil pan seals, intake manifold seals, water pump seals, chain case seals, crankcase seals, cylinder head cover seals, carburetor air filter sealings, cylinder head cap seals, camshaft carrier seals, ramming chamber sealings, push rod space seals, valve shaft seals, O-rings and shaped rings ]