Sourcing lubricant detergent packages from China

Duty on lubricant detergent additive packages

Read from the UK Trade Tariff on 29 September 2026, heading 3811 covers prepared additives for mineral oils and other liquids used for the same purposes. This guide focuses on lubricant detergent packages and detergent concentrates used in blending them. Petroleum-oil content and precise chemistry distinguish the relevant lines. See the fuel and oil additives guide for the wider heading.

The selected lines carry 4% basic duty from China, with no anti-dumping or countervailing measures or attached import controls recorded. Specified formulations within 3811 21 00 90 have 0.00 % suspensions, including an authorised-use suspension. The suspension for 3811 21 00 63 is also under authorised use. The recorded footnotes exclude mixtures or preparations made up of different components containing the listed products. A finished package therefore needs its own assessment.

Ask your broker to compare the full composition, mineral-oil content, total base number and intended use with the commodity-code description. For authorised-use relief, arrange the relevant customs authorisation. Do not claim a suspension merely because a detergent ingredient is listed.

Specify detergent chemistry and blending performance

Specify whether you need a detergent concentrate or a complete detergent-containing package. Record calcium or magnesium chemistry, neutral or overbased character, total base number, metal content, carrier oil, viscosity and water content. Agree test methods and acceptance ranges, the intended base oil, blending temperature and recommended treatment rate.

For a complete package, identify the accompanying dispersant, antioxidant, antiwear and antifoam components. Ask for blending trials using your actual base oil and retain the approved sample. Assess sediment, haze, filterability and storage stability alongside the finished blend's performance.

For supply in Great Britain, ensure the product is correctly labelled and packaged before sale. Hazardous chemicals supplied for workplace use require a safety data sheet. Check UK REACH registration obligations for the substances in the formulation; registration applies to substances in mixtures. Arrange testing and certification support where the factory's evidence needs checking.

Worked duty example

Illustrative example, not a quote: Illustrative order: 5 tonnes of the specified calcium sulphonate additive under 3811 21 00 29, 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

Chemistry: compare total base number, calcium or magnesium content, viscosity and water results with the agreed specification and batch certificate of analysis.

Blend trial: mix the delivery sample into your chosen base oil under the agreed conditions; check haze, sediment, foaming and filterability against the approved trial.

Containers: check seals, leaks, corrosion, batch identification and net contents; investigate settled material before accepting the batch.

Documents: match the formulation, certificate, safety data sheet and hazard label to the delivered batch. Keep a retained sample and use the quality inspection guide to structure acceptance.

What goes wrong

A matching total base number can conceal different detergent chemistry, dilution or metal content. Changing the carrier oil or another package component can produce haze, sediment or excessive foaming in your blend. A concentrate that passes its own analysis can still fail in the intended base oil.

Reject undocumented formulation substitutions and investigate differences between the approved sample and delivery. Separate ingredient analysis from finished-blend performance evidence. Before ordering, check the formulator's batching, sampling and laboratory records through factory verification.

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.