HS Code Heading 3913

3913.10.00 Alginic acid, and its salts and esters, in primary forms 3913.90.10 Chemical derivatives of natural rubber, nesoi, in primary forms 3913.90.20 Polysaccharides and their derivatives, nesoi, in primary forms 3913.90.50 Natural polymers and modified natural polymers, nesoi, in primary forms