Sourcing Phthalimide from China

Zero duty on the relevant imide lines

Heading 2925 covers carboxyimide-function and imine-function compounds. Phthalimide is a candidate for the residual imide line 2925 19 95 90, subject to confirmation of its identity and composition. The table also shows named phthalimide derivatives, which are distinct substances. See the succinimide guide for the wider heading.

Read from the UK Trade Tariff on 1 October 2026, the selected lines carry 0% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duty and no suspensions for these lines. It attaches waste export controls throughout and dangerous-chemical export controls to the residual and tetrahydrophthalimide lines. Ask your customs broker to confirm their relevance to the proposed shipment, especially if material is waste or will be re-exported.

Confirm the commodity code using the chemical identity, composition and batch analysis rather than the supplier's product name alone. A named derivative should be checked against its specific tariff description before using the residual line.

Specify phthalimide identity and batch quality

State whether you want phthalimide itself or a named derivative. Agree assay, analytical method, moisture, residual solvents, relevant process impurities, colour and particle size. Ask for batch-specific results and a representative sample for a trial in your process. Specify sealed liners, drum closures and storage instructions.

Assess your UK REACH registration responsibilities before ordering. Responsibility depends on your role and supply arrangements. Before placing chemicals on the Great Britain market, ensure correct labelling and packaging. A safety data sheet is required when a hazardous chemical is supplied for use at work. Ask for the sheet early so your chemical adviser can review it alongside the specification.

Worked duty example

Illustrative example, not a quote: Illustrative trial order of phthalimide in sealed drums under 2925 19 95 90, invoiced at £3,500 free on board, with £800 of freight and insurance to the UK. The customs value is £4,300. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £4,300, so it is £860. 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 ordered substance, drum labels, invoice and certificate of analysis; distinguish phthalimide from its hydrogenated or brominated derivatives.

Batch results: compare assay, moisture, residual solvents and agreed impurities with the specification; verify that the certificate belongs to the delivered batch.

Powder and packaging: check colour, foreign matter, caking, liner seals, damaged closures and signs of moisture ingress.

Traceability: reconcile drum batch references and net weights with the packing list; retain a labelled sample and arrival photographs.

What goes wrong

A similar product name can conceal a different derivative. An assay result can also look acceptable while moisture, residual solvents or particle size fail your process requirements. Check the full agreed specification and trial the supplied batch before releasing it for production.

Watch for certificates copied from another batch, mixed batch references and powder arriving caked in damaged liners. Agree how disputed results will be checked before shipment. Use testing and certification support to define the analysis and sampling brief.

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.