HS Code 390931
6-digit classification for Crude MDI, with duty lookup and 1688 checks before payment
Official description: Aminoresins, phenolic resins and polyurethanes, in primary forms : Other aminoresins : Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)
Also searched as: crude MDI, polymeric MDI, isocyanate resin, polyisocyanate
Classification
How 390931 breaks down
Plastics and articles thereof
Aminoresins, phenolic resins and polyurethanes, in primary forms
Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)
Short answer
What HS code 390931 means before paying a 1688 supplier
HS code 390931 is the 6-digit HS 2022 starting point for crude mdi; often searched as crude MDI, polymeric MDI, isocyanate resin. 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 390931?
Buyers sourcing poly(methylene phenyl isocyanate) (crude mdi,… from 1688 commonly describe it in these ways. If your product matches, 390931 is likely the right 6-digit starting point — confirm material and intended use against the official tariff.
US import duty · China origin
US import duty for HS 390931
Published USITC HTS rates for poly(methylene phenyl isocyanate) (crude mdi,… (390931), aggregated at the 6-digit level. A research estimate — the final rate depends on your full 8-10 digit HTS line.
Base MFN rate
6.5%
From the US national tariff line under 390931.
Section 301 (China)
+25%
Covered lines under this code carry a Section 301 China surcharge.
Effective China-origin
≈31.5%
Base rate with applicable 301 surcharges — before MPF/HMF and any trade-action changes.
Source: USITC HTS (base MFN) + Section 301 overlay · data as of 2026-07-05 · rates change with trade actions — always confirm your full 10-digit line on hts.usitc.gov before pricing a product. Other markets (EU/UK/CA/AU/SG) below.
Import duty by market
Where to check the import duty for HS 390931
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 China-origin duty evidence across supported markets
Use the HS & import duty checker to estimate duty + VAT/GST for 390931 by destination before you pay a 1688 supplier.
Heading 3909
Other HS codes under 3909
Subheadings in the same 4-digit heading — "Aminoresins, phenolic resins and polyurethanes, in primary forms". If 390931 is not an exact match, one of these may classify your product more precisely.
Questions
HS code 390931: common questions
What is the US import duty for HS code 390931 from China?
As published in the USITC HTS (data as of 2026-07-05), the base MFN rate for 390931 averages about 6.5%, and Section 301 China surcharges apply on covered lines (up to +25%), bringing the effective China-origin rate to roughly 31.5%. This is a research estimate — the final rate depends on your full 8-10 digit HTS line; verify on hts.usitc.gov.
What is HS code 390931?
HS code 390931 is the World Customs Organization 6-digit HS 2022 subheading for "Aminoresins, phenolic resins and polyurethanes, in primary forms : Other aminoresins : Poly(methylene phenyl isocyanate) (crude MDI, polymeric MDI)". The first two digits (39) are the chapter — Plastics and articles thereof — and digits 3-4 (3909) are the heading. Countries add further digits (8-10) for their national tariff line.
What products fall under HS 390931?
Common products classified under 390931 include crude MDI, polymeric MDI, isocyanate resin, polyisocyanate and similar items matching poly(methylene phenyl isocyanate) (crude mdi,…. The correct code still depends on the product's material, function and intended use.
How do I find the import duty for HS code 390931?
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 390931 the same in every country?
The first 6 digits (390931) 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.
Is HSN code 390931 the same as HS code 390931?
Yes at the 6-digit level. India's HSN (Harmonized System of Nomenclature) uses the same WCO base, so HSN 390931 covers the same "poly(methylene phenyl isocyanate) (crude mdi,…" scope; India then extends it to 8 digits for GST and customs. Check the Indian Customs tariff (CBIC) for the full national line.
Chapter 39
Explore Plastics and articles thereof
Sourcing poly(methylene phenyl isocyanate) (crude mdi,… 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.