What are anti-knock preparations?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
HS-4 · Heading
3811 — Anti-knock preparations, oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations and the like, for mineral oils (including gasoline) or other liquids used for the same purposes
Chapter 38: Miscellaneous chemical products
Plain-language overview
Use HS-4 3811 when importing anti-knock preparations or additives for mineral oils, like a shipment of gasoline with lead-based anti-knock agents. This heading covers products that enhance fuel performance and stability.
When deciding between 381111 and 381119, consider the composition of your anti-knock preparations. If they contain lead compounds, use 381111; otherwise, choose 381119 for non-lead alternatives.
For lubricating oil additives, determine if your product contains petroleum oils. If it does, classify it under 381121; if not, use 381129. This distinction is crucial for compliance and accurate tariff classification.
The remaining line, 381190, includes other prepared additives that serve similar purposes but don't fit into the previous categories. Use this for products like oxidation inhibitors or viscosity improvers not specifically listed elsewhere.
Keywords & topics
Useful terms traders and brokers use for this HS-4 heading.
anti-knock preparations · lubricating oil additives · oxidation inhibitors · viscosity improvers · mineral oils additives · lead compounds · petroleum oils · fuel performance enhancers · chemical products for oils · anti-corrosive preparations
Examples
Drawn from the official tariff wording for this HS-4 heading. Always confirm against your published schedule and legal notes.
- Lead-based anti-knock agents for gasoline (HS-6 381111)
- Non-lead anti-knock preparations for diesel fuel (HS-6 381119)
- Additives for lubricating oils derived from petroleum (HS-6 381121)
- Synthetic lubricating oil additives not containing petroleum (HS-6 381129)
- Oxidation inhibitors for mineral oils (HS-6 381190)
- Gum inhibitors for gasoline formulations (HS-6 381190)
- Viscosity improvers for industrial lubricants (HS-6 381190)
Common questions
Frequent classification questions with short practical guidance.
How to classify lubricating oil additives?
Write down material, use, and product form first, then compare nearby lines before you lock the code.
Difference between lead and non-lead anti-knock agents?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
What are viscosity improvers used for?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
How to import oxidation inhibitors?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
What is included in HS-4 3811?
Use this as a comparison hint, then confirm the final decision with legal notes and country-specific rules.
Related topics
Common real-world topics that come up during code comparison.
importing anti-knock preparations for gasoline
Check the exact product specs and destination-country tariff notes before finalizing the code.
classification of lubricating oil additives
Use this topic to narrow your shortlist, then validate the final code against legal wording.
lead-based vs non-lead anti-knock preparations
Compare adjacent HS lines and pick the one that matches material, function, and product form most closely.
uses of viscosity improvers in oils
Use this topic to narrow your shortlist, then validate the final code against legal wording.
guidelines for oxidation inhibitors import
Check the exact product specs and destination-country tariff notes before finalizing the code.
HS-4 3811 product examples and classifications
Use this topic to narrow your shortlist, then validate the final code against legal wording.
how to choose between HS-6 lines under 3811
Use this topic to narrow your shortlist, then validate the final code against legal wording.
chemical products for mineral oils explained
Use this topic to narrow your shortlist, then validate the final code against legal wording.
Questions & answers
For orientation only—the binding text is your national tariff and the WCO nomenclature your country uses.
- What types of products are included in HS-4 3811?
- HS-4 3811 includes anti-knock preparations, lubricating oil additives, oxidation inhibitors, viscosity improvers, and other additives for mineral oils.
- How do I determine the correct HS-6 code for my product?
- Identify the key components of your product. If it contains lead, use **381111**; if not, choose **381119**. For lubricating oil additives, check if they contain petroleum oils.
- Can I use HS-4 3811 for products not specifically listed?
- Yes, if your product serves a similar purpose as those listed under HS-4 3811, it may fall under **381190**, which covers other prepared additives.
- What are the implications of using lead compounds in anti-knock preparations?
- Using lead compounds can affect your classification under **381111** and may have additional regulatory requirements due to environmental concerns.
- Are there any special import regulations for these products?
- Yes, certain products, especially those containing lead or specific chemicals, may require additional documentation or compliance with safety regulations.
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HS-6 subheadings (5)
- 381111Anti-knock preparations; based on lead compounds
- 381119Anti-knock preparations; other than those based on lead compounds
- 381121Lubricating oil additives; containing petroleum oils or oils obtained from bituminous minerals
- 381129Lubricating oil additives; not containing petroleum oils or oils obtained from bituminous minerals
- 381190Oxidation and gum inhibitors, viscosity improvers, anti-corrosive preparations, other prepared additives for mineral oils or liquids used as mineral oils (including gasoline), n.e.c. in heading no. 3811