Sourcing polyethersulfone resin from China

Duty and classification for polyethersulfone

Read from the UK Trade Tariff on 22 November 2026, heading 3911 covers specified resins and polymers in primary forms. Polyethersulfone matching the named chemistry and containing not more than 20% additives appears under 3911 90 19 80. Other formulations need classification review; 3911 90 19 90 is the residual condensation-polymer line. The table separates purchasing forms sharing a code, rather than distinct tariff lines.

The relevant lines carry 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duty and no suspension on these lines. It attaches import and export waste controls. Waste shipment controls apply only where the material is waste. For resin waste from China, ask your customs broker to confirm the applicable controls before shipment.

Confirm the commodity code using the chemical identity, additive content and supplied form, rather than the supplier's trade name alone. See the wider polysulfone resin guide.

Specify chemistry, flow and intended processing

Name polyethersulfone explicitly and agree the manufacturer's grade, polymer identity, virgin or recycled content, fillers, colour and additive composition. Specify granules for moulding or powder for dissolution as appropriate. Agree melt flow or solution viscosity with the test conditions, moisture acceptance, contamination checks and the drying instructions used for your production trial.

Obtain the composition information, supplier's registration position and safety data sheet before ordering. Ask HSE to confirm any classification and safety data sheet requirements relevant to dust and residual solvents. Agree application testing with testing and certification, especially where the resin will become a membrane or a moulded component.

Worked duty example

Illustrative example, not a quote: Illustrative order: one tonne of polyethersulfone granules under 3911 90 19 80, 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: match bag labels, manufacturer, grade and batch certificate to the approved sample and purchase specification.

Processing: check the agreed flow or viscosity results and moisture content; trial a retained sample using your production conditions.

Cleanliness: inspect for black specks, mixed granules, fines and unexpected colour; check powder for foreign particles and dissolution residue.

Packing: check sealed liners, damaged bags, batch traceability and storage instructions on arrival. Record findings using the quality inspection guide.

What goes wrong

A supplier substitutes a related sulfone polymer, changes the filler package or supplies a different viscosity grade under a similar trade name. Moisture, contaminated granules and inconsistent powder can cause moulding defects, filtration problems or an unstable membrane-making solution.

Approve a production trial and retain its sample and batch record. Compare each delivered lot with that baseline before releasing it to production. A certificate headed 'polyethersulfone' is insufficient if its grade, composition or test conditions do not match the order.

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.