Sourcing lubricant dispersants from China

Duty and formulation-specific suspensions

Read from the UK Trade Tariff on 29 September 2026, heading 3811 covers prepared additives for mineral oils and liquids used for the same purposes. This guide focuses on lubricant dispersant additive packages, including succinimide and ester dispersants carried in mineral oil. The table descriptions are shortened: classify against the complete tariff wording, not the supplier's product name.

The selected lines carry 4% base duty for goods from China, with no anti-dumping or countervailing duty and no attached import controls in the supplied tariff record. Listed formulations have 0% suspensions except 3811 21 00 22. Suspensions under 3811 21 00 12, 3811 21 00 19, 3811 21 00 73 and 3811 21 00 80 are subject to authorised-use customs supervision. The suspension footnotes exclude further mixtures, preparations or products containing the listed products.

Ask your customs broker to check chemical identity, mineral-oil content, other composition limits and intended use before claiming a suspension. Goods entered under authorised use remain under customs supervision until discharge. Confirm the commodity code using the full formulation. For related products across the heading, see lubricant detergent additive packages.

Specify the dispersant chemistry and blend

Specify the dispersant chemistry, whether it is borated, active content, carrier-oil identity and proportion, nitrogen and boron content where relevant, total base number, chlorine content, water content and viscosity at an agreed test temperature. Distinguish a dispersant concentrate from a package containing detergents, antioxidants or other additives. Agree test methods and acceptance ranges before approving the sample.

Trial the package in your intended base oil with the other additives and proposed treatment rate. Compare dispersancy, blend clarity, sediment and storage behaviour against an approved reference. Ask for batch certificates of analysis and retain samples of both the concentrate and trial blend.

For Great Britain, check the UK REACH position of the constituent substances and annual import volumes. Registration is per substance and legal entity. Check hazard classification and the applicable labels and packaging before supply. Hazardous chemicals supplied for workplace use require a safety data sheet; request an English version matching the actual formulation.

Worked duty example

Illustrative example, not a quote: Illustrative order: 5 tonnes of reaction-product additive in mineral oil under 3811 21 00 22, invoiced at £24,000 free on board, with £2,200 of freight and insurance to the UK. The customs value is £26,200. Duty at 4% is £1,048. Import VAT at 20% is charged on the customs value plus duty, £27,248, so it is £5,449.60. Import taxes total £6,497.60; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,048 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match drum labels, batch references, formulation details and certificates to the approved dispersant grade.

Chemistry: check active content, carrier-oil proportion, nitrogen, boron where relevant, total base number, chlorine, viscosity and water against the agreed specification.

Blend performance: repeat the agreed trial in your base oil and additive combination; check clarity, sediment and dispersancy against the reference sample.

Packaging and documents: inspect closures, seals and leakage; match the safety data sheet and applicable hazard labels to the batch. Use the quality inspection guide to define sampling and reporting.

What goes wrong

Extra carrier oil can leave viscosity looking acceptable while reducing active content. A changed amine or borated grade can alter blend behaviour despite a similar product name. Water contamination, insoluble material or poor compatibility can produce haze and sediment. Check the concentrate and the finished trial blend before releasing the batch.

A supplier may quote a suspension code for a dispersant ingredient while shipping a broader additive package. Different carrier content or chemistry can also miss the tariff description. Keep the approved formulation, batch analysis and broker's classification together, and confirm any suspension before dispatch.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For repeat volumes, see container programmes.