urethane rubber; cellular rubber ; liquid rubber; rubber sheets; silicone rubber; natural rubber; crude rubber; foam rubber; acrylic rubber; synthetic rubber; gutta-percha, gum, raw or partly processed; asbestos, mica; plastics in extruded form for use in further manufacture; packing and insulating material; insulating material in the nature of rubber and plastics, namely acoustic insulation ; non-metal flexible tubing