… acid) and modified natural polymers (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms. …
Explanatory notes
… 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 3913.90 ‑ Other The following are some of the principal natural or modified natural polymers of this …