… Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened … chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms. …
Explanatory notes
… 39.13 ‑ Natural polymers (for example, alginic acid) and modified natural polymers (for example, hardened … chemical derivatives of natural rubber), not elsewhere specified or included, in primary forms. 3913.10 ‑ Alginic … agents (e.g., calcium salts), retarders (e.g., phosphates, citrates), accelerators (e.g., organic acids), and …