| Tariff Classification |
| section 07 | Plastics and articles thereof; rubber and articles thereof |
| chapter 39 | Plastics and articles thereof |
| 39.13 | Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms: |
| 3913.10 | －Alginic acid, its salts and esters |
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