Sourcing polyvinylpyrrolidone resin from China

Resin at 0%; related copolymers at 6%

Read from the UK Trade Tariff on 6 November 2026, heading 3905 covers vinyl acetate and other vinyl ester polymers, and other vinyl polymers, in primary forms. Unmodified polyvinylpyrrolidone falls within the other vinyl polymer line; specified alkyl-modified versions have separate lines. The table includes a related copolymer line for comparison, not as an interchangeable homopolymer grade.

The selected homopolymer and modified-polymer lines carry 0% duty for goods from China; the other copolymer line carries 6%. These selected lines show no anti-dumping or countervailing duty and no suspension. The tariff attaches import waste controls. Waste shipment controls apply only where the material is waste; for waste resin from China, confirm the applicable requirement with your customs broker before shipping.

Confirm the commodity code using the complete composition, chemical identity and physical form. A copolymer or alkyl-modified resin should not be declared simply as unmodified polyvinylpyrrolidone. See the wider vinyl polymer guide for the rest of the heading.

Specify molecular grade and intended use

State whether you need unmodified polyvinylpyrrolidone, an alkyl-modified resin or a vinylpyrrolidone copolymer. Specify the viscosity grade and test method, solution concentration and temperature, moisture, residual monomer, ash, appearance and dissolution behaviour. For solutions, record solids content and every solvent or additive. Agree acceptance limits and obtain a batch certificate of analysis.

Confirm with HSE how UK REACH registration requirements, exemptions and thresholds apply to the polymer and its monomers. Obtain the supplier's safety data sheet and clarify the registration position before ordering. Chemical classification is the responsibility of suppliers, including importers into Great Britain. Match the evidence to the actual resin composition rather than relying on a generic grade name.

Worked duty example

Illustrative example, not a quote: Illustrative pilot batch of unmodified polyvinylpyrrolidone powder in sealed lined bags under 3905 99 90 99, invoiced at £1,230 free on board, with £1,500 of freight and insurance to the UK. The customs value is £2,730. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £2,730, so it is £546. 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 the purchase specification, bag labels and certificate of analysis; distinguish homopolymer, copolymer and alkyl-modified material.

Performance: test viscosity under the agreed conditions and run a dissolution trial in the intended solvent or formulation.

Purity: verify moisture, residual monomer and ash against the agreed limits using representative batch samples.

Packing: check liners, seals, batch identification and production dates; record wet bags, caking and contamination. Use the inspection guide to define sampling and reporting.

What goes wrong

A familiar grade name can hide a different viscosity, molecular distribution or composition. Moisture and caking can make powder harder to dispense, while an unsuitable grade can change dissolution and formulation viscosity. Alkyl-modified material should be trialled in its intended formulation rather than assessed against the behaviour of unmodified resin.

A generic certificate can miss batch variation or omit residual monomer results. Approve a sample against written acceptance criteria, retain it for comparison and check each delivered batch before releasing it into production.

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.