Sourcing acrylic processing aids from China

Normally 6%, with narrowly defined suspensions

Read from the UK Trade Tariff on 1 October 2026, heading 3906 covers acrylic polymers in primary forms. Acrylic copolymer processing aids not separately listed are candidates for 3906 90 90 90, carrying 6% duty from China. The comparison rows cover distinct chemistries, not interchangeable processing grades. A supplier's description of an additive as an acrylic processing aid does not establish its code.

The supplied tariff data lists no anti-dumping or countervailing duty. The residual line has a 0% suspension limited to specified products, not a general exemption for processing aids. Its supplied description is incomplete, so confirm the full scope before claiming relief. The listed epoxy-functional copolymer has a suspension, subject to its exact description and mixture exclusion. The listed core-shell mixture carries 6%; the PMMA suspension covers specified sheets.

The tariff attaches import waste controls to the residual and listed copolymer or mixture lines. For a China shipment classed as waste under notification controls, shipping to England can begin only after consent from the Environment Agency and other competent authorities involved. Confirm waste status and applicable requirements with your customs broker. Use the commodity code guide and compare the all-acrylic impact modifier guide.

Specify fusion and melt behaviour in your formulation

State whether the aid is for rigid PVC extrusion, transparent products or foam. Specify polymer composition, powder form, particle size distribution, moisture, bulk density and the supplier's viscosity test method. Agree the intended addition level and assess fusion time, torque, melt strength and surface finish using your own resin, stabiliser and lubricant package.

Approve a trial batch against a retained reference sample. For foam, compare cell uniformity and collapse; for transparent products, compare haze, colour and visible specks. A matching trade name or viscosity result alone does not establish equivalent performance.

Confirm with HSE the UK REACH registration position for the polymer, its monomers and additives. Check hazard classification and the applicable classification, labelling and packaging duties before supplying the grade in Great Britain. A hazardous chemical supplied for workplace use requires a safety data sheet.

Worked duty example

Illustrative example, not a quote: Illustrative order: 20 tonnes of acrylic processing aid powder under 3906 90 90 90, 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 bag grade, batch reference and certificate of analysis to the approved chemistry and sample.

Powder: check moisture, particle distribution, caking and foreign particles against the agreed specification.

Performance: trial an arrival sample in the approved formulation and compare fusion, torque, surface finish and relevant foam or clarity results.

Packing: check sealed liners, dry bags and legible batch labels; retain samples and use the quality inspection guide to plan checks.

What goes wrong

A replacement grade can change fusion behaviour even when its powder appearance matches. A different viscosity profile or interaction with lubricants can produce unstable extrusion, rough surfaces or poor foam structure. Compare grades in the actual formulation before approving substitution.

Moisture and caking can disrupt feeding; contamination can leave specks in finished products. Hold affected lots pending investigation. Keep technical approval separate from the customs assessment: a processing claim does not prove eligibility for a tariff suspension.

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.