17 GUTTA PERCHA, INDIA-RUBBER, BALATA AND SUBSTITUTES, ARTICLES MADE FROM THESE SUBSTANCES AND NOT INCLUDED IN OTHER CLASSES; PLASTICS IN THE FORM OF SHEETS, BLOCKS AND RODS, BEING FOR USE IN MANUFACTURE; MATERIALS FOR PACKING, STOPPING FOR INSULATING; ASBESTOS, MICA AND THEIR PRODUCTS, HOSE PIPES (NON-METALLIC)