HS Code 391390

HS code 391390 is the World Customs Organization 6-digit HS 2022 subheading for "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 : Other". The first two digits (39) are the chapter — Plastics and articles thereof — and digits 3-4 (3913) are the heading. Countries add further digits (8-10) for their national tariff line.

Common products classified under 391390 include modified natural rubber, hardened protein, casein plastic, natural polymer, gutta percha and similar items matching natural polymers. The correct code still depends on the product's material, function and intended use.

Duty is set by the destination country, not by the 6-digit HS code alone. Start from the official tariff of your market — USITC HTS (US), TARIC / Access2Markets (EU), GOV.UK Trade Tariff (UK), CBSA (Canada), ABF (Australia) or Singapore Customs — and look up the full national code with China as the country of origin.

The first 6 digits (391390) are the same worldwide under the WCO Harmonized System. Beyond that, each country extends the code (HTS in the US, TARIC in the EU, etc.) and sets its own duty and tax rates.

Treat a supplier-provided code as a clue, not a final classification. It can be incomplete, China-export-specific, or mismatched to your destination's rules. Verify against the official tariff and your product's actual material and use.