HS Code 391390
6-digit classification for Natural Polymers (for Example,…, with duty lookup and 1688 checks before payment
Official 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 : Other
Also searched as: modified natural rubber, hardened protein, casein plastic, natural polymer, gutta percha
Classification
How 391390 breaks down
Plastics and articles thereof
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
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
Short answer
What HS code 391390 means before paying a 1688 supplier
HS code 391390 is the 6-digit HS 2022 starting point for natural polymers (for example, alginic…; often searched as modified natural rubber, hardened protein, casein plastic. Before using it in a landed-cost estimate, confirm the product material, function, destination market, and the official tariff source. Treat any 1688 supplier code as a clue, not the final import classification.
Use
Start with this 6-digit HS code and compare the product's material, function, and use.
Verify
Check the destination market's official HTS, TARIC, commodity-code, duty, VAT, or GST source.
Decide
If classification, documents, or restricted-product risk is unclear, submit the product for a written check.
Covered products
What products fall under HS code 391390?
Buyers sourcing natural polymers (for example, alginic acid) and… from 1688 commonly describe it in these ways. If your product matches, 391390 is likely the right 6-digit starting point — confirm material and intended use against the official tariff.
Import duty by market
Where to check the import duty for HS 391390
The 6-digit code is universal, but duty, VAT and GST are set by the destination country and depend on the full national tariff line with China as the country of origin. Start from the official source for your market.
United States
USITC / CBP · Harmonized Tariff Schedule (HTS)
European Union
TARIC · Access2Markets
United Kingdom
HMRC · UK Integrated Online Tariff
Canada
CBSA · Canadian Customs Tariff
Australia
ABF · Australian customs tariff
Singapore
Singapore Customs · Singapore Trade Classification (HS)
Compare the real China-origin import tax across markets
Use the HS & import duty checker to estimate duty + VAT/GST for 391390 by destination before you pay a 1688 supplier.
Heading 3913
Other HS codes under 3913
Subheadings in the same 4-digit heading — "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". If 391390 is not an exact match, one of these may classify your product more precisely.
Questions
HS code 391390: common questions
What is 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.
What products fall under HS 391390?
Common products classified under 391390 include modified natural rubber, hardened protein, casein plastic, natural polymer, gutta percha and similar items matching natural polymers (for example, alginic acid) and…. The correct code still depends on the product's material, function and intended use.
How do I find the import duty for HS code 391390?
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.
Is HS code 391390 the same in every country?
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.
Can I trust the HS code a 1688 supplier gives me?
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.
Chapter 39
Explore Plastics and articles thereof
Sourcing natural polymers (for example, alginic acid) and… from 1688?
Get a written pre-payment check — classification clues, China-origin landed cost, and supplier risk — before you commit. 5,754 HS codes covered.