39.13Heading

Natural polymers (e.g. alginic acid) and modified natural polymers (e.g. hardened proteins, chemical derivatives of natural rubber), n.e.c. or included, in primary forms

Section VII — Plastics and articles thereof; rubber and articles thereof

Code	Description
3913.10	Polymers, natural; alginic acid, its salts and esters, in primary forms
3913.90	Polymers, natural and modified natural; in primary forms (excluding alginic acid, its salts and esters)