Sourcing battery separator paper from China

Duty and classification for separator paper rolls

Read from the UK Trade Tariff on 1 October 2026, heading 4805 covers other uncoated paper and paperboard in rolls or sheets, with processing restricted by the chapter note. The supplied lines all carry 0% duty for goods from China, with no listed anti-dumping or countervailing duty, suspensions or import controls.

The table compares possible other-paper lines by grammage and recovered-paper content. It does not establish that every grade is suitable for battery separators. Only consider recovered fibre if your technical specification permits it. Confirm the commodity code using the fibre composition, grammage and details of any treatment.

This guide concerns uncoated paper rolls for battery manufacture. Give your broker the material specification rather than relying on the supplier's description of 'separator'. For the wider paper family, see uncoated filter base paper.

Specify paper for the intended electrolyte

Name the battery chemistry, electrolyte and intended separator function. Specify fibre composition, grammage, thickness, porosity, electrolyte uptake, wet strength and dimensional stability under your agreed test conditions. Agree acceptance criteria for pinholes, particles and metallic contamination. Approve samples through your battery development process before accepting the production grade.

Set roll width, diameter, core dimensions, winding direction, tension, splice identification and protective wrapping. Ask the mill to disclose binders, additives and treatments. REACH restrictions can limit, ban or set conditions on substances; use the composition information to check relevant restrictions.

Virgin wood-pulp paper falls within the UK Timber Regulations. Confirm with the relevant authority what timber due-diligence requirements apply to an importer first placing in-scope paper on the Great Britain market. Obtain pulp-source information, including species and country of harvest, alongside batch records.

Worked duty example

Illustrative example, not a quote: 12 tonnes of uncoated battery separator paper rolls, subject to classification confirmation (illustrative) under 4805 91 00 90, invoiced at £30,000 free on board, with £3,500 of freight and insurance to the UK. The customs value is £33,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £33,500, so it is £6,700. 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

Paper properties: check batch results for grammage, thickness, porosity, uptake and wet strength against the agreed specification, using the agreed conditioning and electrolyte.

Cleanliness: inspect samples for pinholes, embedded particles, metallic specks and loose fibres; compare contamination results with your acceptance criteria.

Roll condition: check width, cores, winding, marked splices and edge damage before dispatch and again on arrival.

Packing and records: check dry, intact wrapping, batch identification and matching mill reports. Keep suspect rolls separate pending investigation. Plan sampling through quality inspection.

What goes wrong

A paper sample can look acceptable while its uptake, wet strength or dimensional stability fails in the intended electrolyte. Uneven thickness, pinholes or contamination can undermine separator performance. Specify tests for your battery application rather than accepting a generic paper test report.

Loose winding, concealed splices, crushed cores and damp wrapping can cause feeding problems or contaminate the paper. Compare delivered batches with the approved sample and investigate any change in fibre mix or treatment before releasing them to 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.