Sourcing uncoated capacitor paper from China

Duty and classification for capacitor paper

Heading 4805 covers other uncoated paper and paperboard in rolls or sheets, within its permitted processing scope. The supplied lines do not name capacitor paper. The table shows the other-paper weight bands and a recovered-paper comparison, rather than interchangeable capacitor grades. Heavier board and recovered-paper grades should not be accepted as substitutes for the specified dielectric paper.

Read from the UK Trade Tariff on 1 October 2026, all supplied lines carried 0% duty for goods from China. The record lists no anti-dumping or countervailing duties, suspensions or attached import controls. This tariff result does not remove timber due diligence for virgin-pulp paper first placed on the Great Britain market.

Confirm the commodity code using pulp composition, grammage, reel or sheet format and any coating or impregnation. The reference guides place electro-technical insulating kraft paper under heading 4804, so an electrical application alone does not establish heading 4805. See the wider uncoated electrical insulation pressboard guide.

Specify the dielectric paper and pulp source

State that the order is uncoated capacitor paper, with the agreed pulp composition and no unapproved coating, impregnation or fibre substitution. Specify thickness and its variation, grammage, density, moisture, ash and conductivity of the aqueous extract. Agree dielectric breakdown and loss test methods, sample conditioning and whether testing is on dry or impregnated paper.

Specify slit width, reel diameter, core size, winding direction, splice identification and moisture-resistant wrapping. Trial the approved sample through winding and the intended impregnation process before accepting a production grade.

Virgin-pulp paper falls within the UK Timber Regulations. Confirm with the relevant authority what timber-source due diligence the business first placing it on the Great Britain market must carry out. Obtain pulp-source, species and harvest-country information from the mill; keep this separate from the paper's electrical performance reports.

Worked duty example

Illustrative example, not a quote: Illustrative consignment of uncoated capacitor-paper reels, subject to classification under 4805 91 00 90, invoiced at £27,000 free on board, with £5,200 of freight and insurance to the UK. The customs value is £32,200. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £32,200, so it is £6,440. 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

Electrical properties: check batch-linked breakdown and dielectric loss results against the agreed methods and conditioning.

Paper cleanliness: inspect for pinholes, hard particles and visible contamination; compare moisture, ash and extract-conductivity results with the specification.

Reels: measure thickness variation and slit width; check winding, cores, edges and identified splices.

Arrival condition: inspect wrapping for tears, wetting and condensation before opening; retain labelled samples and follow the agreed storage conditions.

What goes wrong

Moisture uptake can change electrical behaviour, while particles or pinholes can create weak points. A satisfactory average thickness can conceal local thin areas. Results from differently conditioned samples can also appear comparable when they are not.

Rough slit edges, uneven winding and hidden splices can disrupt capacitor winding. Agree batch acceptance criteria and investigate suspect reels before production use. Use the quality inspection guide to brief the inspection.

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.