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

6 declarable lines

Heading 3811 covers prepared additives that are put into mineral oils, gasoline, or other liquids used for the same purposes, such as antiknock preparations, oxidation inhibitors, gum inhibitors, viscosity improvers, and anti-corrosive preparations. The heading splits first by type of additive: antiknock preparations (3811.11 for lead-based, 3811.19 for other), additives for lubricating oils (3811.21 for those containing petroleum oils, 3811.29 for other), and a residual line 3811.90.00.00 for everything else in the heading.

Products in this heading

Tetraethyl lead antiknock fluid for gasoline
Mixed tetraethyl and tetramethyl lead antiknock compound
Lead-based antiknock additive packages for motor fuel
Detergent and dispersant additive packages for engine oils containing petroleum oils
Viscosity index improvers for lubricating oils
Oxidation inhibitors for lubricating oils
Anti-corrosive additive preparations for oil-based fluids
Pour point depressants and other prepared lubricating oil additives

How to choose the right subheading

The type of preparation: antiknock, additive for lubricating oils, or other prepared additive.
For antiknock preparations, whether the active base is a lead compound.
For lead-based antiknock preparations, whether it is tetraethyl lead or a tetraethyl and tetramethyl lead mixture, or another lead compound.
For lubricating oil additives, whether the preparation contains petroleum oils or oils obtained from bituminous minerals.
The liquid the product is made for: mineral oil, gasoline, or another liquid used for the same purposes.

Often confused with

Antioxidizing preparations and other compound stabilizers for rubber or plastics
Prepared rubber accelerators and rubber or plastics stabilizers have their own heading.
Heading 3812
Pickling preparations for metal surfaces and soldering fluxes
Metal treatment and welding auxiliary preparations are classified in 3810.
Heading 3810
Prepared binders for foundry molds or cores
Foundry binders are named in 3824, not in the oil additive heading.
Heading 3824
A separate chemically defined compound, such as a pure antioxidant sold on its own
Isolated chemically defined compounds are classified in the organic chemicals chapters, not as prepared additives.
Prepared additives for cement, mortar or concrete
Additives for construction materials are not for mineral oils and fall in the residual chemical heading.
Heading 3824

Frequently asked questions

What is the HTS code for antiknock preparations based on tetraethyl lead?

They are classified under 3811.11.10.00, which covers tetraethyl lead or a mixture of tetraethyl lead and tetramethyl lead. The general (MFN) rate is Free.

What is the duty on additives for lubricating oils that contain petroleum oils?

Additives for lubricating oils containing petroleum oils or oils obtained from bituminous minerals fall under 3811.21.00.00. The general (MFN) rate is 6.5%.

How do I classify a lead-based antiknock preparation other than tetraethyl lead?

Other lead-based antiknock preparations go under 3811.11.50.00. The general (MFN) rate is Free.

Guide written from the official schedule text. Rates quoted are general (MFN) rates; check the line page for trade agreement rates and the classification of your exact product.