Sourcing Choline Hydroxide from China

Choline hydroxide duty and suspension limits

Read from the UK Trade Tariff on 1 October 2026, heading 2923 covers quaternary ammonium salts and hydroxides, lecithins and other phosphoaminolipids. Choline hydroxide sits within choline and its salts, 2923 10 00 00. The supplied tariff facts show 6% duty for goods from China and no anti-dumping or countervailing measure.

The line’s 0% suspension names choline chloride and calcium phosphoryl choline chloride tetrahydrate; it does not name choline hydroxide. Pharmaceutical relief requires the substance to qualify under the relevant listing. Do not assume that laboratory use qualifies. The tariff also attaches an export waste control; ask your customs broker to confirm its relevance to the proposed shipment.

Give your broker the chemical identity, solvent, concentration and full composition to confirm the commodity code. This guide uses the relevant choline line rather than unrelated substances to fill the table. For other hydroxides within the heading, see the tetramethylammonium hydroxide guide.

Specify hydroxide strength and impurity testing

Specify choline hydroxide explicitly, with the solvent and concentration expressed by weight. Agree a hydroxide assay method and acceptance limits for chloride, carbonate and metal impurities relevant to your process. Ask the factory to distinguish hydroxide assay from total choline content and supply actual batch results. Agree container material, closure, sampling arrangements and storage instructions before ordering.

Substances and mixtures sold in Great Britain must be classified and labelled under its classification, labelling and packaging rules, and packaged correctly before sale. Hazardous chemicals supplied for workplace use require a safety data sheet. Check your UK REACH position when annual substance imports reach one tonne or more; registration is per substance and legal entity.

Worked duty example

Illustrative example, not a quote: Illustrative pilot order of choline hydroxide solution in sealed drums under 2923 10 00 00, invoiced at £2,500 free on board, with £1,800 of freight and insurance to the UK. The customs value is £4,300. Duty at 6% is £258. Import VAT at 20% is charged on the customs value plus duty, £4,558, so it is £911.60. Import taxes total £1,169.60; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £258 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match the purchase order, drum labels, batch certificate and safety data sheet to choline hydroxide and the agreed solvent.

Assay: test a representative arrival sample using the agreed hydroxide method; compare concentration and impurity results with the purchase specification.

Packaging: check closures, seals, leakage, container damage and batch identification before releasing stock.

Documents: match batch results to the delivered drums and check classification, labels and packaging before sale. Arrange testing support where independent analysis is needed.

What goes wrong

Guard against a supplier quoting choline chloride against a hydroxide enquiry, reporting total choline instead of hydroxide strength, or providing a generic purity certificate without the agreed impurity results. A sample approved for one solvent or concentration cannot establish acceptance of a different formulation.

Release can also stall when drum batch references do not match the certificate, closures leak, or labels describe a different formulation. Quarantine discrepancies, retain the batch evidence and request investigation before use. A suspension available to another choline compound should not be copied onto the hydroxide customs entry.

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.