Harmonized Tariff Schedule of the United States · HTS code · HS 3812.31

3812.31.00

3812.31.00: Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)

Not declarable on its own: use one of its 1 subdivisions Data: Harmonized Tariff Schedule of the United States · checked on 24 October 2026

  1. 3812 Prepared rubber accelerators; compound plasticizers for rubber or plastics, not elsewhere specified or included; antioxidizing preparations and other compound stabilizers for rubber or plastics:
  2. Anti-oxidizing preparations and other compound stabilizers for rubber or plastics:
  3. 3812.31.00 Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)

What you pay

Importing into USA

Customs duty 6.5% standard rate depends on the country of origin
Additional duties and charges 1 additional measure
VAT no federal VAT; a Merchandise Processing Fee of 0.3464 % is charged on formal entries
Duty calculatorCalculate duty and taxes →

US additional duties of HTS chapter 99 in force on 22 October 2026 are included (Section 301, 232, 338 and 201). IEEPA duties are no longer collected after the Supreme Court ruling of February 2026. Conditional exemptions (US content, end use, metal share) are not computed: check the provision.

Additional duties and import rules

Charges on top of the customs duty, and rules the goods must meet at the border.

Additional duties and charges 1

  • Additional dutySection 301 — China — technology transfer, IP and innovation (2018 actions and 2024 four-year review) 25%
    Applies to goods from
    China
    In force
    from 24 September 2018
    Legal act
    HTSUS 9903.88.03

Preferential rates by country

Agreement or schemeCountriesRate
General (MFN)—6.5%
US–Australia FTA AUAustraliaFree
US–Bahrain FTA BHBahrainFree
US–Chile FTA CLChileFree
US–Colombia TPA COColombiaFree
US–Israel FTA ILIsraelFree
US–Jordan FTA JOJordanFree
US–Korea FTA KRSouth KoreaFree
US–Morocco FTA MAMoroccoFree
US–Oman FTA OMOmanFree
CAFTA-DR PCosta Rica, Dominican Republic, El Salvador, Guatemala, Honduras, NicaraguaFree
US–Panama TPA PAPanamaFree
US–Peru TPA PEPeruFree
USMCA SCanada, MexicoFree
US–Singapore FTA SGSingaporeFree
Column 2Cuba, North Korea, Russia, Belarus3.7¢/kg + 60%

Special: reduced rates under trade agreements and preference programmes; the letters in brackets name the programmes (for example AU = Australia FTA, KR = Korea FTA).

Same subheading in other tariffs

3812.31 Mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)

UK Free Third-country duty 1 tariff line EU 6.5% Third-country duty 1 tariff line Türkiye 6.5% Third-country duty 1 tariff line Canada Free Third-country duty 1 tariff line Mexico Free Third-country duty 1 tariff line Brazil 12.6% Third-country duty 1 tariff line Argentina 12.6% Third-country duty 1 tariff line Peru Free Third-country duty 1 tariff line New Zealand Free Third-country duty 1 tariff line Japan 2.6% – 4.4% Third-country duty 2 tariff lines · average 3.5% Taiwan 5% Third-country duty 1 tariff line GCC 5% Third-country duty 1 tariff line Switzerland Free Third-country duty 1 tariff line Norway Free Third-country duty 1 tariff line North Macedonia Free Third-country duty 1 tariff line Nigeria 5% Third-country duty 1 tariff line

Legal notes

Chapter notes: Chapter 38 →

Code history

Since 2017; before, these goods were classified under 3812.30.

HTS code 3812.31.00 is a line of the Harmonized Tariff Schedule of the United States under HS subheading 3812.31 (mixtures of oligomers of 2,2,4-trimethyl-1,2-dihydroquinoline (TMQ)).

The general duty is 6.5%, and quantities are declared in kg.

For the same subheading, the UK duty is free, the EU duty is 6.5%, the Türkiye duty is 6.5%, the Canada duty is free, the Mexico duty is free, the Brazil duty is 12.6%, the Argentina duty is 12.6%, the Peru duty is free, the New Zealand duty is free, the Japan duty is 2.6%–4.4%, the Taiwan duty is 5%, the GCC duty is 5%, the Switzerland duty is free, the Norway duty is free, the North Macedonia duty is free and the Nigeria duty is 5%.

The United States imported goods of subheading 3812.31 worth US$43m in 2024; the largest supplier was Germany.

Questions and answers

What is the USA import duty for HTS code 3812.31.00?

The general duty in the Harmonized Tariff Schedule of the United States is 6.5%; the supplementary unit is kg. Preferential rates for goods from agreement countries, anti-dumping duties and VAT are not included.

Is there a lower rate for 3812.31.00 under US trade agreements?

Yes. The Special column reads “Free (A, AU, BH, CL, CO,D,E, IL, JO,K, KR, MA, OM,P, PA, PE,S, SG)”: the letters in brackets name the agreements and programmes that grant it.

Where does the United States import these goods from?

For subheading 3812.31 as a whole, the largest supplier in 2024 was Germany (US$28m), followed by China.

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