Heading 3811: Antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers…
Every line of heading 3811 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
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
Chapter 38: Miscellaneous chemical products. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 3811.11 | Based on lead compounds: | |
| 3811.11.10.00 | Based on tetraethyl lead or on a mixture of tetraethyl lead and tetramethyl lead | Free |
| 3811.11.50.00 | Other | Free |
| 3811.19.00.00 | Other | 6.5% |
| 3811.21.00.00 | Containing petroleum oils or oils obtained from bituminous minerals | 6.5% |
| 3811.29.00.00 | Other | 6.5% |
| 3811.90.00.00 | Other | 6.5% |
Public records · unclaimed listings
U.S. manufacturers in this industry, from public records
These companies are not Fromerica members and did not write these listings: Fromerica created them from public government records and has not verified what the records say. You cannot contact them from here. Open a listing to see what the record says.
- AZURE WATER SERVICES, LLC
- CARRUBBA, INCORPORATED
- DEXSIL CORPORATION
- HUBBARD-HALL INC.
- MICROCARE, LLC
Is one of these your company? Find your listing and claim it →
And 1 more in the public records. See all →
Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 3811 has 5 of them. Schedule B lookup →
- 3811.11.0000ANTIKNOCK PREPARATIONS BASED ON LEAD COMPOUNDS
- 3811.19.0000ANTIKNOCK PREPARATIONS, NESOI
- 3811.21.0000ADDITIVES FOR LUBRICATING OILS CONTAINING PETROLEUM OILS OR OILS OBTAINED FROM BITUMINOUS MINERALS
- 3811.29.0000ADDITIVES FOR LUBRICATING OILS EXCEPT THOSE CONTAINING PETROLEUM OILS OR OILS OBTAINED FROM BITUMINOUS MINERALS
- 3811.90.0000ADDITIVES FOR LUBRICATING OILS, NESOI
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
Buying these products from the U.S.?
Tell us what you need and we will find U.S. manufacturers who can quote you. Free, no account needed.