Section 07 Plastics and articles thereof; rubber and articles thereof 40 Rubber and articles thereof 40 01 Natural rubber, balata, gutta-percha, guayule, chicle and similar natural gums, in primary forms or in plates, sheets or strip. 40 01 22 Technically specified natural rubber, in primary forms or in plates, etc Commodity Code Description 40 01 22 00 Technically specified natural rubber, in primary forms or in plates, etc