Sourcing esculin from China
Esculin from China normally carries 6% UK duty under the residual glycosides line; 0% pharmaceutical relief needs confirmation for the exact substance. Before supplying it in Great Britain, ensure correct chemical labelling and packaging. Specify identity, hydration and assay basis. Cambridge China Bridge sources esculin.
Esculin duty and classification
Read from the UK Trade Tariff on 4 October 2026, heading 2938 covers natural or synthetic glycosides and their salts, ethers, esters and other derivatives. For separate esculin, check the residual line 2938 90 90 90. The table's esculin entries share this code and describe different buying uses.
The supplied tariff data lists 6% duty for Chinese-origin goods on this line, with no anti-dumping or countervailing measure. Its 0% suspension covers a specified purified steviol glycoside for beverage manufacture, rather than esculin. The published background also identifies relief for listed pharmaceutical substances; confirm eligibility before assuming 0%. The tariff attaches an export waste control. Ask your customs broker to confirm its applicability; waste-shipment controls apply only when the material is waste.
Give your broker the chemical identity, hydration state, composition and intended use, and confirm the commodity code before shipment. Have prepared culture media and blended reagents assessed separately. For related glycosides within the heading, see the salicin guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Esculin for laboratory reagents | 2938 90 90 90 | 6% | None |
Specify esculin identity and assay basis
Write esculin and its synonym aesculin into the purchase specification. State whether you want hydrated or anhydrous material, and require the supplier to identify the form offered. Agree an identity test, assay method, reporting basis, water content, residual-solvent checks and packaging. Ask for a batch certificate of analysis and a retained sample.
For culture-medium manufacture, trial the sample in your own formulation and compare its performance with your approved material. For analytical work, distinguish a routine reagent from material supplied with characterised reference values. Specify what evidence you expect for the intended use.
Before supplying chemicals in Great Britain, ensure correct labelling and packaging. Check your UK REACH position against annual imports of the substance, and confirm the applicable registration threshold with HSE. Registration is per substance and legal entity. Use testing and certification support to define the checks.
Worked duty example
Illustrative example, not a quote: Illustrative small batch of esculin for laboratory reagent preparation under 2938 90 90 90, invoiced at £1,500 free on board, with £100 of freight and insurance to the UK. The customs value is £1,600. Duty at 6% is £96. Import VAT at 20% is charged on the customs value plus duty, £1,696, so it is £339.20. Import taxes total £435.20; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £96 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Identity: compare the container name, chemical identifier and hydration state with the order and batch certificate; investigate any reference to a different compound.
Assay: compare the agreed test method and reporting basis with the certificate, and check water and residual-solvent results against your specification.
Application: test the delivered batch in the intended reagent or culture-medium formulation against the approved sample.
Packing and records: check seals, moisture protection, batch traceability and label accuracy; retain an arrival sample. See the quality inspection guide.
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What goes wrong
A chromatographic purity result can be mistaken for an assay on the agreed basis. Hydration, moisture or a changed test method can make certificates difficult to compare. Treat mismatched identity documents, damaged seals, caking or unexpected application results as reasons to hold the batch for investigation.
Do not accept a generic plant-extract certificate as evidence for isolated esculin. Fix the substance identity, hydration state and analytical method before ordering, then compare the production batch with the approved sample. Have any proposed food or medicinal use assessed separately from the laboratory purchase.
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.
Frequently asked questions
What is the UK import duty on esculin from China?
The residual line 2938 90 90 90 lists 6% duty. Confirm any pharmaceutical relief for the exact substance. The listed steviol-glycoside suspension does not cover esculin.
Are esculin and aesculin different products?
They are alternative names. Put both in the specification and confirm the chemical identifier and hydration state so the supplier's documents describe the material you ordered.
What should an esculin certificate of analysis show?
Ask for batch identity, hydration state, assay method and reporting basis, water content and agreed impurity results. Compare these with the purchase specification and arrival sample.
Can I use laboratory esculin in food or medicines?
Have the intended use assessed separately. A laboratory certificate establishes only the results it reports; it does not establish suitability for your proposed food or medicinal application.