Sourcing bituminous pipe enamels from China

Duty and waste controls

Read from the UK Trade Tariff on 29 September 2026, heading 2715 covers bituminous mixtures based on natural asphalt, natural bitumen, petroleum bitumen, mineral tar or mineral tar pitch. This guide concerns pipe-coating enamels supplied as mixtures. The table lists binder types sharing the supplied commodity code, rather than separate tariff lines.

The supplied line carries 0% duty for goods from China, with no anti-dumping or countervailing duty and no suspension recorded. The tariff attaches import and export waste controls. Confirm the material's waste status with your customs broker. For notified waste from China into England, the exporter must apply to the dispatch authority for consent; confirm with the relevant competent authorities which destination and transit consents are needed and when shipment may proceed.

Confirm the commodity code using the full formulation and intended application, rather than the supplier's product name alone. For the wider heading and other coating forms, see our bituminous waterproofing paint guide.

Specify the enamel and heated application

State the binder source, filler composition, pipe material, surface preparation and whether the enamel is for external coating. Agree softening point, penetration, application temperature, coating thickness, flexibility and adhesion acceptance criteria. Give the factory the intended primer and reinforcing wrap details, and approve a coating trial using the same materials.

For hot-applied enamel, agree the heating and mixing instructions, maximum holding conditions and a method for checking changes after heating. Request a safety data sheet matching the formulation. Use testing and certification support to agree checks on the material and the applied coating.

Before sale in Great Britain, arrange classification and labelling by someone with scientific competence. Importers must ensure correct labelling and packaging before placing mixtures on the market. Ask your chemical adviser to check the formulation's UK REACH position before approving production.

Worked duty example

Illustrative example, not a quote: Illustrative order: 20 tonnes of bituminous pipe-coating enamel in sealed drums under 2715 00 00 00, invoiced at £24,000 free on board, with £1,800 of freight and insurance to the UK. The customs value is £25,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £25,800, so it is £5,160. 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

Identity: match the binder declaration, batch certificate and safety data sheet to the approved enamel.

Material: compare softening point, penetration, contamination and behaviour after the agreed heating cycle with the retained sample.

Coating: trial the enamel on prepared pipe with the intended primer and wrap; check thickness, adhesion, cracking and pinholes using the agreed methods.

Packing: inspect drum damage, seals, moisture ingress and batch identification on arrival. Record discrepancies through the quality inspection guide.

What goes wrong

A substituted binder or changed filler content can alter flow, hardness and flexibility. A sample that coats clean steel may fail on the buyer's actual primer or surface preparation. Compare production material with the approved sample through the agreed heating and application trial.

Excessive heating can change application behaviour, while damp material or a damp substrate can leave bubbles and coating defects. Do not accept a waterproofing paint sample as evidence that a hot-applied pipe enamel will perform. For reclaimed feedstock, resolve waste status and the attached tariff control before shipment.

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.