Sourcing phenothiazine from China

Phenothiazine identity determines the duty

Read from the UK Trade Tariff on 1 October 2026, heading 2934 covers nucleic acids and other heterocyclic compounds. Its phenothiazine branch covers compounds containing a phenothiazine ring-system, not further fused. The supplied facts contain only the named methylthiophenothiazine line, so the table contains that verified entry rather than unrelated chemicals.

For goods from China, 2934 30 90 10 has a base duty of 6% and an autonomous suspension to 0.00%. Its footnote excludes mixtures, preparations and products made up of different components containing the substance. No anti-dumping or countervailing measure is recorded. The tariff attaches an export waste control; confirm its relevance with your customs broker. Waste shipment controls apply only where the material is waste.

The published wider guide describes other phenothiazines as 0% for listed pharmaceutical substances and 6% otherwise. That does not establish suspension eligibility for plain phenothiazine. Give your broker the chemical name, structure, composition and chemical identifier to confirm the commodity code. See the wider heterocyclic compounds guide for the heading context.

Specify phenothiazine, not just the family name

State whether you want phenothiazine itself or a named derivative. Agree the chemical identifier, structure, grade, assay method, impurity profile, residual solvents, moisture and physical form. Ask for a batch certificate of analysis and an English safety data sheet. Keep an approved sample and agree written notification before the factory changes its synthesis route.

For Great Britain, ask HSE to confirm the applicable UK REACH registration requirements and whether an only-representative arrangement covers your imports, taking account of annual volume. If the material is an active substance for licensed human medicines, ask MHRA to confirm the applicable registration requirements. Settle the intended use and registration position before ordering.

Worked duty example

Illustrative example, not a quote: Illustrative trial batch of methylthiophenothiazine; confirm suspension eligibility under 2934 30 90 10, invoiced at £15,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £16,500. Duty at 6% is £990. Import VAT at 20% is charged on the customs value plus duty, £17,490, so it is £3,498. Import taxes total £4,488; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £990 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match the chemical identifier and structure on the order, drum labels and batch certificate; distinguish phenothiazine from methylthiophenothiazine.

Assay and impurities: arrange laboratory testing against the agreed method and approved sample; compare the impurity profile and residual solvents with the certificate.

Condition: check for moisture ingress, caking, damaged liners, leaking closures and differences from the approved physical form.

Labels and documents: match each container to its batch certificate and safety data sheet. Chemicals must be labelled and packaged correctly before being placed on the market.

What goes wrong

A family name on a quotation can hide a different derivative, while a matching product name can conceal an unsuitable impurity profile. A factory route change can alter residual solvents or related substances. Hold a disputed batch apart from accepted stock while identity and assay are checked.

Duty errors arise when the named derivative's suspension is assumed to cover plain phenothiazine or a preparation. Ask the broker to check the exact substance and suspension footnote before claiming relief. Do not treat a batch certificate as evidence that your import registration arrangements are complete.

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.