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:
| Subheading | Description | General | Special | Other |
|---|---|---|---|---|
| 3913.10 | 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 | — | — | — |
| 3913.90 | Other: | — | — | — |