Valves of rubber or vulcanized fiber not including machine elements; sheets of synthetic resin-based material for use as gaskets, seals, packings, and heat insulators; junctions for plumbing pipes not of metal; joint packings for plumbing pipes; electrical insulating materials; industrial packaging containers of rubber; rubber stoppers for industrial packaging containers; rubber lids and caps for industrial packaging containers; plastic substances, semi-processed; rubber raw or semi-worked