Section 07 PLASTICS AND ARTICLES THEREOF; RUBBER AND ARTICLES THEREOF 39 Plastics and articles thereof 39 13 Natural polymers (for example, alginic acid) and modified natural polymers (for 39 13 10 39 13 10 00 Commodity Code Description 39 13 10 00 00 - Alginic acid, its salts and esters 39 13 90 00 00 - Other