Sourcing Papain Enzymes from China

Papain classification and zero duty

Heading 3507 covers enzymes and prepared enzymes not elsewhere specified or included. For papain, check the residual line 3507 90 90 90 against the complete formulation and intended use. The table shows different papain forms under the same provisional line, rather than separate tariff subdivisions.

Read from the UK Trade Tariff on 30 September 2026, the supplied residual line carries 0% duty for goods from China, with no listed anti-dumping or countervailing duty and no suspension. The UK Trade Tariff attaches Veterinary control. Confirm with your customs broker whether it applies to the actual formulation and what documents are required before dispatch.

Provide the broker with the enzyme identity, source declaration, carriers, additives and intended use to confirm the commodity code. For the wider heading, see the food-grade alpha-amylase guide.

Specify papain activity and intended use

State whether the papain is for food processing or laboratory work. Request a source declaration, complete formulation and details of any carrier or preservative. Agree powder, granule or liquid form, activity units, assay method, assay temperature and acidity, moisture specification, storage conditions and packaging.

For food processing, the food-enzyme rules apply; confirm the enzyme and proposed use with the Food Standards Agency before ordering. Its guidance says the domestic food-enzyme list is not yet established. A supplier's food-grade description does not settle your application-specific checks.

Ask for a batch certificate of analysis using the agreed assay, with microbiological and heavy-metal results for food grade. Arrange testing and certification support around the actual application and agreed specification.

Worked duty example

Illustrative example, not a quote: Illustrative order: a batch of papain powder in sealed drums under 3507 90 90 90, invoiced at £22,000 free on board, with £1,800 of freight and insurance to the UK. The customs value is £23,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £23,800, so it is £4,760. 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

Activity: compare the batch certificate with the contract and test a retained sample using the agreed assay.

Formulation: match the source declaration, carriers and preservatives to the approved sample and purchase specification.

Packing: check seals, batch identification, moisture protection and evidence that agreed transport conditions were maintained.

Handling: check dustiness against the agreed specification and review the safety data sheet before opening powder containers. Many enzymes are respiratory sensitisers, as explained in the site's enzyme guide.

What goes wrong

Papain activity figures are difficult to compare when suppliers use different assay methods. A diluted preparation can look acceptable by weight while failing the agreed activity specification. Heat exposure, damp packing and substitutions of carriers can also undermine the buyer's process.

Approve the formulation and assay before production, retain a reference sample and test the arriving batch before releasing it into your process. Resolve food-use questions and the veterinary-control flag before shipment rather than relying on a generic certificate.

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.