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Home › Chapter 38 › Heading 3811

HS Heading 3811 : Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils

HEADING DEFINITION & DISAMBIGUATION

HS Heading 3811 encompasses antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils. It classifies 5 6-digit WCO subheadings within Chapter 38 under the Harmonized System [USITC HTS 2026].

Chapter
Heading
3811
Subheadings
5 HS6
Status
Verified 2026

Subheadings Under Heading 3811

HS Code WCO 6-Digit Subheading Description Chapter Operational Package
3811.11 Antiknock preparations, Based on lead compounds 38 View 3811.11 Package →
3811.19 Antiknock preparations, Other 38 View 3811.19 Package →
3811.21 Additives for lubricating oils, Containing petroleum oils or oils obtained from bituminous minerals 38 View 3811.21 Package →
3811.29 Additives for lubricating oils, Other 38 View 3811.29 Package →
3811.90 Other 38 View 3811.90 Package →
DISAMBIGUATION & CLASSIFICATION GUIDE

How to Select the Correct Subheading Under Heading 3811

Commercial shipments must be declared under the exact 6-digit WCO subheading that matches physical, chemical, or processing characteristics. Review the subheading descriptions above and verify against binding CBP CROSS rulings prior to entry filing.

Official Primary Sources & Authority References

USITC HTS Heading 3811 ↗

United States International Trade Commission official Harmonized Tariff Schedule.

CBP CROSS Rulings ↗

CBP e-Rulings database for Heading 3811 precedent rulings.

WCO Nomenclature ↗

World Customs Organization Harmonized System 2022 nomenclature standard.

U.S. Census Foreign Trade ↗

U.S. Census Bureau HTS-to-NAICS concordance and Schedule B export database.

Heading 3811 Frequently Asked Questions (FAQ)

What commercial articles are grouped under HS Heading 3811?
HS Heading 3811 covers Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, anti-corrosive preparations and other prepared additives, for mineral oils (including gasoline) or for other liquids used for the same purposes as mineral oils, grouping 5 6-digit WCO subheadings.
How are 6-digit subheadings structured under Heading 3811?
Subheadings under Heading 3811 range from 3811.11 to 3811.90, classifying goods by processing state, origin, or material composition.
What is the representative US import duty rate for Heading 3811?
US MFN general duty rates for Heading 3811 commodities range from Duty-Free up to representative ad valorem percentages under the 2026 US HTS.
Are Section 301 tariffs applicable to goods under Heading 3811?
Section 301 additional tariffs depend on the specific 8-digit or 10-digit US HTS code and country of origin (e.g. China Lists 1–4A).
What PGA message set flags apply to Heading 3811?
Partner Government Agency flags (FDA, USDA APHIS, EPA) apply depending on the specific commodity sub-classification.
How do I distinguish between subheadings under Heading 3811?
Review WCO subheading terms and candidate descriptions. For example, unroasted vs. roasted or decaffeinated vs. non-decaffeinated.
Can goods under Heading 3811 enter duty-free under USMCA?
Yes. Goods originating in USMCA territories (US, Mexico, Canada) enter duty-free under SPI code P with a valid Certificate of Origin.
What is the Section 321 de minimis limit for Heading 3811?
Eligible import shipments valued at $800 USD or less imported by one person on one day enter duty-free under 19 U.S.C. 1321.
What documents are required for formal customs entry of Heading 3811?
Commercial Invoice, Packing List, Bill of Lading, and CBP Form 7501 are mandatory for entries exceeding $2,500 USD.
How can an importer get a binding CBP classification ruling for Heading 3811?
Importers may apply for a binding ruling via CBP National Commodity Specialist Division under 19 CFR Part 177.