Sourcing heavy copper PCBs from China

Zero duty on heavy copper printed circuits

Read from the UK Trade Tariff on 30 September 2026, heading 8534 covers printed circuits. The supplied lines distinguish multilayer circuits consisting only of conductor elements and contacts, other such circuits, and circuits with other passive elements. Heavy copper is a fabrication specification; choose the line by the circuit's construction.

Every supplied line carries 0% duty for goods from China. The file lists no anti-dumping or countervailing duty, suspensions or attached import controls. Only the supplied commodity lines are shown in the table. For another board family within this heading, see metal-core printed circuit boards.

Confirm the commodity code using the fabrication drawing and details of any mounted components. An assembled board needs classification according to its function rather than an assumption that it remains a bare printed circuit.

Specify finished copper and the current path

Send controlled fabrication files and a drawing stating the stack-up, laminate, board thickness, finished copper thickness on each layer, track widths, clearances, hole sizes, hole-wall plating, surface finish and solder mask. Distinguish starting foil thickness from finished copper thickness. Agree where the factory will measure copper and which coupon results accompany the batch.

Ask the factory to review etching clearances, copper distribution and mask coverage around raised copper features before production. Approve any drawing changes before releasing the files. Request electrical testing of every board and sample microsections showing conductor thickness and plated holes.

For boards used in electrical products sold in the UK, obtain material declarations for the laminate, mask and finish to support the finished product's restricted-substance compliance. Official guidance requires the finished-product manufacturer to determine and demonstrate component compliance before incorporation.

Worked duty example

Illustrative example, not a quote: Illustrative order of 5,000 multilayer heavy copper bare boards under 8534 00 11 00, invoiced at £20,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £21,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £21,500, so it is £4,300. 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

Copper build: compare measured finished conductor thickness and hole-wall plating with the drawing; examine batch microsections for voids, cracks and uneven plating.

Geometry and mask: check track widths, etched clearances, finished holes and mask registration, especially around thick copper edges and solder pads.

Electrical and assembly: match every board to its electrical test record; sample solderability and measure bow and twist before assembly.

Batch identity: check file revision, laminate declarations, coupon reports and lot labels; inspect arrival packaging for moisture or damage.

What goes wrong

A quote can describe starting copper foil while the buyer expects a finished conductor thickness. Etching can narrow tracks or leave copper bridges in tight gaps, and poor mask coverage can expose copper beside pads. Thin or voided hole plating can leave the current path unreliable despite thick surface copper.

Uneven copper distribution can contribute to bow and twist, while unsuitable laminate can blister or delaminate during assembly. Hold batch release against the agreed drawing, electrical records and microsection evidence. Resolve discrepancies before using the boards in production.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.