# 391310 — 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: Alginic acid, its salts and esters

HS code 391310 classifies 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: Alginic acid, its salts and esters. It belongs to Chapter 39 (Plastics and articles thereof) of Section VII (Plastics and articles thereof; rubber and articles thereof) of the Harmonized System. Duty rates are recorded for 1 country.

> Section VII · Plastics and articles thereof; rubber and articles thereof
> Chapter 39 · Plastics and articles thereof

**HS code:** `391310`

## Description

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 : Alginic acid, its salts and esters

## Duty rates

| Country | Rate | Programme | Effective from |
| --- | --- | --- | --- |
| US United States | 4.2% | MFN | 2026-01-01 |

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Source: https://eximagent.ai/hscode/39/391310
Last updated: 2026-06-03
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