Parent chapter HS 39 - Plastics and articles thereof Subheadings in this heading HS 391310Alginic acid, its salts and estersHS 391390HS subheading 391390 Final HS codes HS 39131000Alginic acid, its salts and estersHS 39139010Hardened proteinsHS 39139020Chemical derivatives of natural rubberHS 39139030Starch-based polymersHS 39139090Other