Sourcing polymethylpentene resin from China

6% for ordinary polymethylpentene resin

Read from the UK Trade Tariff on 1 October 2026, heading 3902 covers polymers of propylene or other olefins in primary forms. For polymethylpentene resin granules, use residual code 3902 90 90 99 as a classification candidate. The table describes purchasing variants under that same line, rather than separate tariff subdivisions. See the wider olefin-polymer guide.

The supplied tariff record gives this line a standard China duty of 6%, with no anti-dumping or countervailing duty recorded. It attaches a 0% suspension for specified synthetic poly-alpha-olefins, which does not establish eligibility for polymethylpentene. It also attaches an import waste control. Waste shipment controls apply only to waste; for a shipment from China whose waste status is uncertain, confirm the applicable requirement with your customs broker before dispatch.

Confirm the commodity code using the polymer composition, additives and supplied form. Ask for the supplier's compliance position and a safety data sheet. For food-contact use, obtain a grade-specific declaration of compliance and the supporting migration-testing information, as explained in the published wider guide.

Specify the polymethylpentene grade and process

Name polymethylpentene explicitly in the purchase specification and identify the actual producer and reference grade. Agree whether the resin is virgin or contains reprocessed material, its colour, additive package, melt flow test conditions and batch acceptance criteria. A description such as clear heat-resistant resin is insufficient to approve a substitution.

Describe the intended moulded or extruded part. Agree how transparency, dimensional stability, release behaviour and resistance to the intended cleaning process will be assessed on trial parts. Compare samples using the same processing conditions and test methods. For food-contact applications, match the paperwork to the exact grade and intended contact conditions.

Worked duty example

Illustrative example, not a quote: Illustrative order: one tonne of natural polymethylpentene resin granules under 3902 90 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 6% is £1,170. Import VAT at 20% is charged on the customs value plus duty, £20,670, so it is £4,134. Import taxes total £5,304; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,170 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match the producer, grade and bag batch markings to the purchase order, datasheet and certificate of analysis.

Pellets: inspect samples from different bags for black specks, mixed granules, fines and inconsistent colour.

Processing: compare melt flow results using the agreed conditions, then trial parts for clarity, warpage and release behaviour.

Packing: check sealed liners, bag damage and batch traceability; retain labelled samples before releasing the lot to production.

What goes wrong

A substitute resin can resemble the approved pellets but behave differently during moulding. Undeclared reprocessed material, contamination or changed additives can affect appearance and processing. A certificate that names only the polymer family leaves the actual grade unresolved.

Keep an approved sample and require written agreement before any grade or formulation change. Quarantine a mismatched batch and compare trial parts before mixing it with accepted stock. Use the quality inspection guide to organise sampling and acceptance evidence.

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.