Sourcing N-Chlorosuccinimide from China

Zero duty under the candidate imide code

Heading 2925 covers carboxyimide-function compounds and imine-function compounds. For N-chlorosuccinimide supplied as a separate chemical substance, 2925 19 95 90, other imides and their derivatives, is the candidate line to confirm. The supplied tariff facts contain only this relevant residual line, so the table does not add unrelated chemicals.

Read from the UK Trade Tariff on 1 October 2026, this line carries 0% duty for goods from China, with no anti-dumping or countervailing duty and no suspension recorded. The tariff attaches export controls on dangerous chemicals and waste. Ask your customs broker to confirm their applicability to the intended movement. Check the substance against the official prior informed consent list; unlisted substances have no notification obligations under that scheme.

Confirm the commodity code using the chemical identity, composition and presentation. Give the broker the specification and safety data sheet, particularly for a blend or preparation. See the succinimide guide for the wider product family.

Specify active chlorine and batch identity

Write N-chlorosuccinimide explicitly on the purchase specification. Agree identity testing, assay, active chlorine, moisture, residual succinimide and particle form, with the test method and acceptance criteria for each. Ask whether assay is reported on an as-received or dry basis. Require a certificate of analysis tied to the production batch and retain a sample for comparison.

Agree sealed packaging, liner compatibility and storage conditions using the supplier's safety data sheet. Check your UK REACH registration position for the substance and importing legal entity before ordering. Chemicals must be labelled and packaged correctly before being placed on the market; hazardous chemicals supplied for workplace use require a safety data sheet.

Worked duty example

Illustrative example, not a quote: Illustrative order: 98 kg of N-chlorosuccinimide under 2925 19 95 90, invoiced at £1,960 free on board, with £800 of freight and insurance to the UK. The customs value is £2,760. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £2,760, so it is £552. 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 purchase specification, container labels and batch certificate to N-chlorosuccinimide, rather than succinimide or N-bromosuccinimide.

Analysis: compare identity, assay, active chlorine and moisture results with the agreed methods and acceptance criteria. Arrange independent testing through testing and certification.

Packaging: check seals, liners, closures and signs of leakage or moisture ingress. Record caking, discolouration or damaged containers for investigation.

Documents: match batch references across the certificate, labels and packing list. Check that the safety data sheet describes the supplied substance and agreed handling conditions.

What goes wrong

A headline purity result can conceal a mismatch in active chlorine, moisture or reporting basis. A certificate for a different batch does not establish the quality of the delivered material. Test the agreed properties rather than accepting the product name and assay alone.

Poor seals, caked powder or changed appearance need investigation before release into your process. Hold the affected batch, compare retained and arrival samples, and obtain the supplier's explanation. Agree who pays for investigation, replacement or disposal in the purchase terms.

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.