Sourcing oil viscosity improvers from China
Lubricant viscosity index improver preparations from China carry 4% base UK duty, potentially 0% for the listed copolymer under authorised use. GB importers must ensure correct chemical labelling and packaging before sale; confirm classification requirements with HSE and check the UK REACH position. Cambridge China Bridge sources lubricant viscosity index improvers.
Duty and conditional suspension
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, including viscosity improvers. This guide covers lubricant viscosity index improver preparations. See fuel and oil additives for the wider heading. The table repeats a residual code to show different polymer preparations that may fall within it.
The selected lines carry 4% base duty for goods from China, with no anti-dumping or countervailing measures or attached import controls in the supplied record. The listed copolymer under 3811 21 00 25 has a 0.00 % suspension under authorised use, subject to customs supervision and a footnote excluding mixtures containing the listed product. Residual lines also have narrowly described suspensions; these are not blanket relief for viscosity improvers.
Give your customs broker the polymer identity, carrier composition, molecular-weight information and intended use. Match the complete tariff description and suspension footnotes before claiming relief. Confirm the commodity code, including whether the goods are a prepared lubricant additive rather than a polymer supplied as such.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Listed polymethacrylate copolymer additive in mineral oil | 3811 21 00 25 | 4% | None |
| Other oil-containing polymethacrylate viscosity improver preparations | 3811 21 00 90 | 4% | None |
| Other lubricant viscosity improver preparations without petroleum oil | 3811 29 00 90 | 4% | None |
Specify the polymer and the finished blend
Specify polymer chemistry, active polymer content, carrier oil, concentrate viscosity at agreed test temperatures, dissolution conditions and storage instructions. Agree the base oil, dosage and blending procedure for acceptance tests. Set requirements for the finished blend's viscosity index, low-temperature behaviour and viscosity retention after shear. Compare results using the same methods and base oil.
Before placing the chemicals on the Great Britain market, the importer must ensure that they are labelled and packaged correctly. Confirm the applicable chemical classification requirements with HSE. Check the UK REACH position for the formulation's substances. A hazardous chemical supplied for workplace use requires a safety data sheet. Request composition information and an English safety data sheet for the actual grade.
Worked duty example
Illustrative example, not a quote: Illustrative order of drums of oil-containing viscosity index improver under 3811 21 00 90, invoiced at £30,000 free on board, with £3,000 of freight and insurance to the UK. The customs value is £33,000. Duty at 4% is £1,320. Import VAT at 20% is charged on the customs value plus duty, £34,320, so it is £6,864. Import taxes total £8,184; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,320 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Identity: check batch identifiers, polymer and carrier declarations, and the certificate of analysis against the approved formulation.
Concentrate: check appearance, active content, viscosity, sediment and water contamination against agreed acceptance criteria.
Blend performance: test a retained sample in the agreed base oil for dissolution, viscosity index, cold behaviour and viscosity retention after shear.
Arrival: check drum seals, leaks, net contents and batch labels; reconcile the safety data sheet and hazard information with the delivered grade.
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What goes wrong
A concentrate can match its supplied viscosity yet fail in your base oil. Excess carrier oil, a changed polymer grade or poor dissolution can produce a blend that misses the target. Initial thickening also does not establish shear stability. Require blend results and retain an approved sample before accepting a substitute grade.
Check arriving material for gel, sediment and damaged containers before blending it into stock. Keep suspect batches separate while comparing samples and records. Arrange testing and certification support around the actual formulation and your acceptance methods.
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.
Frequently asked questions
What is the UK import duty on viscosity index improvers from China?
The selected prepared lubricant additive lines carry 4% base duty. The listed copolymer may qualify for 0.00 % under authorised use; relief depends on the exact description and footnotes.
Does every viscosity improver qualify for duty suspension?
No. The recorded suspensions cover specific descriptions and conditions. A shared residual code does not make every polymer preparation eligible.
What should I ask the Chinese supplier to test?
Ask for active content and concentrate viscosity, plus blend tests in your specified base oil covering viscosity index, low-temperature behaviour and viscosity retention after shear.
Do I need a safety data sheet for imported viscosity improver?
A hazardous chemical supplied for workplace use requires a safety data sheet. Request the sheet for the actual formulation and check the UK REACH position before ordering.