Sourcing hydrogenated nitrile rubber from China

Duty and classification for hydrogenated rubber

Read from the UK Trade Tariff on 1 October 2026, heading 4002 covers synthetic rubber in primary forms or plates, sheets and strip, alongside factice and specified rubber mixtures. The supplied lines do not name hydrogenated nitrile rubber explicitly. The table gives classification comparisons, rather than interchangeable codes for the same grade. See the wider nitrile rubber guide.

Every supplied line carries 0% duty for goods from China, with no listed anti-dumping or countervailing duty and no listed suspension. Import and export waste controls are attached. Waste shipment controls apply only where the material is waste. For waste rubber from China, confirm the applicable requirement with your customs broker and the destination environmental regulator before shipment.

Confirm the commodity code using the composition, hydrogenation information, physical form and details of any plastics, fillers or curatives. Unvulcanised compounded rubber belongs to heading 4005, as explained in the reference guide. Do not classify hydrogenated rubber solely from the supplier's ordinary nitrile rubber code.

Specify hydrogenation, viscosity and cure behaviour

Specify the manufacturer's grade, acrylonitrile content, degree of hydrogenation or residual unsaturation, Mooney viscosity and permitted batch variation. Identify additives and whether the material is a base polymer or a prepared compound. Agree packaging, storage conditions and batch traceability, and retain an approved sample.

Have your compounder trial the grade in the intended recipe. Compare cure behaviour, processing and the finished compound's performance in the intended fluid and temperature conditions. Agree the test methods and acceptance criteria before ordering.

Confirm with HSE whether UK REACH registration requirements or exemptions apply to the polymer, monomers and additives, and what supply-chain coverage evidence is needed. Ask for composition and supply-chain coverage evidence. A safety data sheet is required if the chemical is hazardous and supplied for workplace use.

Worked duty example

Illustrative example, not a quote: Illustrative order: 2,000 kg of hydrogenated nitrile rubber bales, subject to classification confirmation under 4002 99 90 00, invoiced at £40,000 free on board, with £2,000 of freight and insurance to the UK. The customs value is £42,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £42,000, so it is £8,400. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match manufacturer, grade and batch markings to the purchase specification and batch certificate of analysis. Check the reported hydrogenation and acrylonitrile content.

Processing: sample separate bales and compare Mooney viscosity and cure curves with the approved material using the agreed methods.

Condition: inspect wrapping, contamination, moisture, cold flow and sticking. Check delivered weight and packaging damage.

Application: compare trial compounds for hardness, tensile behaviour, compression set and fluid ageing against your agreed acceptance criteria. Arrange testing and certification support where needed.

What goes wrong

An ordinary nitrile grade supplied against a hydrogenated grade specification may appear similar on arrival. Missing hydrogenation data, changed additives or viscosity drift can also undermine the approved recipe. A matching trade name or a generic technical sheet does not establish batch conformity.

Hold material with mismatched labels or unexplained test results before production. Compare it with the retained sample and obtain a documented supplier response. Agree sampling and release checks through the quality inspection guide.

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.