… (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in …
Explanatory notes
… (for example, hardened proteins, chemical derivatives of natural rubber), not elsewhere specified or included, in … its salts and esters 3913.90 ‑ Other The following are some of the principal natural or modified natural polymers of this heading. (1) Alginic acid, its salts and esters …