HS Code 381231
6-digit classification for Mixtures of Oligomers of…, with duty lookup and 1688 checks before payment
Official description: Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; antioxidising preparations and other compound stabilisers for rubber or plastics : Antioxidising preparations and other compound stabilisers for rubber or plastics : Mixtures of oligomers of 2,2,4trimethyl1,2dihydroquinoline (TMQ)
Also searched as: TMQ antioxidant, rubber antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline, TMQ oligomer
Classification
How 381231 breaks down
Miscellaneous chemical products
Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; antioxidising preparations and other compound stabilisers for rubber or plastics
Mixtures of oligomers of 2,2,4trimethyl1,2dihydroquinoline (TMQ)
Short answer
What HS code 381231 means before paying a 1688 supplier
HS code 381231 is the 6-digit HS 2022 starting point for mixtures of oligomers of…; often searched as TMQ antioxidant, rubber antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline. 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 381231?
Buyers sourcing mixtures of oligomers of… from 1688 commonly describe it in these ways. If your product matches, 381231 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 381231
Published USITC HTS rates for mixtures of oligomers of… (381231), 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 381231.
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 381231
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 381231 by destination before you pay a 1688 supplier.
Heading 3812
Other HS codes under 3812
Subheadings in the same 4-digit heading — "Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; antioxidising preparations and other compound stabilisers for rubber or plastics". If 381231 is not an exact match, one of these may classify your product more precisely.
Questions
HS code 381231: common questions
What is the US import duty for HS code 381231 from China?
As published in the USITC HTS (data as of 2026-07-05), the base MFN rate for 381231 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 381231?
HS code 381231 is the World Customs Organization 6-digit HS 2022 subheading for "Prepared rubber accelerators; compound plasticisers for rubber or plastics, not elsewhere specified or included; antioxidising preparations and other compound stabilisers for rubber or plastics : Antioxidising preparations and other compound stabilisers for rubber or plastics : Mixtures of oligomers of 2,2,4trimethyl1,2dihydroquinoline (TMQ)". The first two digits (38) are the chapter — Miscellaneous chemical products — and digits 3-4 (3812) are the heading. Countries add further digits (8-10) for their national tariff line.
What products fall under HS 381231?
Common products classified under 381231 include TMQ antioxidant, rubber antioxidant, 2,2,4-trimethyl-1,2-dihydroquinoline, TMQ oligomer and similar items matching mixtures of oligomers of…. The correct code still depends on the product's material, function and intended use.
How do I find the import duty for HS code 381231?
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 381231 the same in every country?
The first 6 digits (381231) 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 381231 the same as HS code 381231?
Yes at the 6-digit level. India's HSN (Harmonized System of Nomenclature) uses the same WCO base, so HSN 381231 covers the same "mixtures of oligomers of…" scope; India then extends it to 8 digits for GST and customs. Check the Indian Customs tariff (CBIC) for the full national line.
Chapter 38
Explore Miscellaneous chemical products
Sourcing mixtures of oligomers of… 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.