Section 07 Plastics and articles thereof; rubber and articles thereof 39 Plastics and articles thereof 39 17 Tubes, pipes and hoses, and fittings therefor, of plastics 39 17 31 Of other condensation or rearrangement polymerisation products; of cellulose nitrate, 39 17 31 25 Of other condensation or rearrangement polymerisation products; of cellulose nitrate, Commodity Code Description 39 17 31 25 00 Of other condensation or rearrangement polymerisation products; of cellulose nitrate,