HTS 3811Chapter 38· 2026_rev10

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:

General (MFN)

—

Special / FTA

—

Column 2

—

Use in Landed Cost Calculator Check Tariff Impact

Rate shown is General (Column 1) MFN from the 2026_rev10. Additional duties may apply including the 10% Section 122 global surcharge and Section 301 duties on Chinese-origin goods. Last reviewed: 2026_rev10.

Selling internationally? Easyship uses HS codes like 3811 to display duty + tax at your buyer's checkout — one inclusive price, no doorstep invoice. Sponsored.

Try Easyship free

Subcodes under 3811

3811.90.00.006.5%

Other

Related codes at this level

3801

Artificial graphite; colloidal or semi-colloidal graphite; preparations based on graphite or other carbon in the form of pastes, blocks, plates or other semimanufactures:

3802

Activated carbon; activated natural mineral products; animal black, including spent animal black:

3803.00.00.00Free

Tall oil, whether or not refined

3804.00

Residual lyes from the manufacture of wood pulp, whether or not concentrated, desugared or chemically treated, including lignin sulfonates, but excluding tall oil of heading 3803:

3805

Gum, wood or sulfate turpentine and other terpenic oils produced by the distillation or other treatment of coniferous woods; crude dipentene; sulfite turpentine and other crude para-cymene; pine oil containing alpha-terpineol as the main constituent:

3806

Rosin and resin acids, and derivatives thereof; rosin spirit and rosin oils; run gums:

Frequently asked

What HTS codes fall under 3811?

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:. Subcodes further classify products by material, use, or form — see the subcodes list below.

What is the duty rate for 3811?

Duty rates are not set at the 4-digit heading level. Drill down to the 8 or 10-digit tariff line that matches your product.

Does the 10% Section 122 surcharge apply to 3811?

Yes — the Section 122 global surcharge applies in addition to the base MFN rate shown above. Use our Tariff Impact Calculator to see the total landed rate for your product.

Use this code in

Landed Cost Calculator

Duty + tax + shipping

Get the full import cost for this code — prefilled and ready to compute.

Open calculator

2026 Tariff Impact Calculator

Section 122 + 301 + 232 stacked

See the stacked duty rate for this code under current and proposed tariff rules.

Check tariff impact

2026 tariff rules are moving fast — the Section 122 surcharge expires July 24, 2026 and Section 301 lists keep changing. One short email when rates change. No spam, unsubscribe anytime.

We email at most once a month. By subscribing you agree to our privacy policy.