Section 07 Plastics and articles thereof; rubber and articles thereof 40 Rubber and articles thereof 40 05 Compounded rubber, unvulcanized, in primary forms or in plates, etc 40 05 10 Rubber compounded with carbon black or silica, unvulcanized Commodity Code Description 40 05 10 00 Rubber compounded with carbon black or silica, unvulcanized 40 05 10 10 Of natural gums 40 05 10 90 Other
