Sourcing copper heat pipes from China

Duty and classification for copper heat pipes

Read from the UK Trade Tariff on 4 November 2026, heading 7419 covers other articles of copper. The supplied snapshot lists 0% duty throughout the heading for goods from China, with no anti-dumping or countervailing duties, suspensions or attached import controls.

The table shows heat pipe forms sharing the same provisional other-articles line, rather than separate tariff subdivisions. Confirm the commodity code using the drawing, materials, sealed working fluid and description of the supplied assembly. Do not assume that an empty copper tube and a completed heat pipe have the same classification.

Specify the wick, fluid and installed orientation

Specify copper grade, outside dimensions, wall thickness, flattened profile, bend geometry, contact surfaces and plating. Name the wick construction and working fluid, and agree the permitted operating temperature range. State whether the supplier delivers finished shapes or parts that your assembler will bend.

Agree a thermal acceptance test with the heat input, mounting orientation, heated and cooled lengths, cooling conditions and permitted temperature difference recorded. Test the finished geometry. For the adjoining cooling component, see our aluminium heat sinks guide.

Pressure equipment rules cover equipment and assemblies with a maximum allowable pressure above 0.5 bar. Ask the manufacturer to document the maximum allowable pressure and assess the applicable scope before ordering. Use testing and certification support to resolve the assessment for the actual design.

Worked duty example

Illustrative example, not a quote: 4,000 copper heat pipes, illustrative order subject to classification confirmation under 7419 80 90 98, invoiced at £20,000 free on board, with £800 of freight and insurance to the UK. The customs value is £20,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £20,800, so it is £4,160. 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

Geometry: measure diameter, flattened thickness, bend position and contact flatness against the approved drawing; trial-fit samples in the intended assembly.

Thermal performance: repeat the agreed test in the installed orientation and compare the measured temperature difference with the acceptance criteria.

Sealing: review leak-test records for the delivered batch and check sealed ends for cracks, damaged joints or distortion.

Surface and packing: check plating, scratches and contamination; confirm protective trays prevent crushing and bending. Plan these checks through the quality inspection guide.

What goes wrong

A heat pipe can fit the drawing yet transfer too little heat. Possible causes include an unsuitable wick, incorrect fluid charge, trapped gas, leakage or damage during flattening and bending. A sample tested horizontally may also perform differently in the buyer's installed orientation.

Approve samples in their final shape and test them under the intended cooling conditions. Keep batch test records tied to the delivered parts, and agree how failed thermal tests or damaged seals will be investigated before accepting replacements.

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.