Sourcing polyvinyl isobutyl ether from China

Resin duty and the residual polymer line

Read from the UK Trade Tariff on 1 October 2026, heading 3905 covers polymers of vinyl acetate or other vinyl esters, and other vinyl polymers, in primary forms. For unformulated polyvinyl isobutyl ether resin, confirm the residual other-vinyl-polymers line 3905 99 90 99. The table's grade descriptions share this commodity line. See the wider heading guide.

The supplied tariff data records 0% duty for goods from China on 3905 99 90 99, with no anti-dumping or countervailing duty and no suspension recorded. Other products within the heading carry 6%, with suspensions on some specified lines. Confirm the resin's composition and supplied form using finding your commodity code, particularly if the supplier offers a formulated adhesive or solvent mixture.

The tariff attaches import and export waste controls. Waste shipment controls apply only where the material is waste. For a China-to-England import under notification controls, the exporter applies to the dispatch country's competent authority; shipment starts only after consent from the Environment Agency and other authorities involved. Ask your customs broker to confirm the applicable control and document condition, including for destinations elsewhere in the UK.

Specify the resin and its viscosity test

Name polyvinyl isobutyl ether explicitly, and distinguish the homopolymer from a copolymer or formulated blend. State whether you want neat resin or a solution, identify any solvent and additives, and agree non-volatile content, colour, residual monomer and the molecular-weight information needed for your process.

Specify viscosity together with the test temperature, instrument and, where relevant, solvent and concentration. Compare samples in your intended adhesive or coating formulation for compatibility, tack, film appearance and flexibility. Agree storage conditions, acceptable batch age and sealed packaging.

Confirm the UK REACH registration position for the polymer and its monomers with HSE. Obtain the supplier's composition information and registration position. Classification and labelling must be handled by someone with scientific competence, and supply-chain businesses are responsible for correct labelling and packaging before sale. A safety data sheet is required for hazardous chemicals supplied for workplace use.

Worked duty example

Illustrative example, not a quote: Illustrative order: 20 drums of unformulated polyvinyl isobutyl ether resin under 3905 99 90 99, invoiced at £18,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £19,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £19,500, so it is £3,900. 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: check the resin name, grade and batch against the purchase order, analysis certificate and supplier's composition information.

Viscosity: test an arrival sample using the agreed conditions, and compare non-volatile content and colour with the approved sample.

Performance: trial the batch in your actual formulation; inspect compatibility, tack and the dried film for haze, particles or unevenness.

Packing: check seals, leakage, contamination, batch marks and production dates; retain a labelled sample from each batch.

What goes wrong

A viscosity result can look acceptable while referring to a different solvent, concentration or temperature. An undeclared dilution or additive can change compatibility and film behaviour. Ask for the complete test conditions and approve the supplied composition before ordering.

Leaking drums, contaminated resin and inconsistent batches can interrupt formulation work. Keep suspect material separate until it has been checked against the agreed specification, and use quality inspection to define sampling and acceptance checks.

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.