Sourcing ceramic shell slurries from China
Investment casting ceramic shell slurries entered as foundry auxiliary preparations carry 6% UK duty from China, with no suspension shown for that line. Chemical supply duties include correct labelling and packaging before market supply. Cambridge China Bridge sources investment casting ceramic shell slurries.
6% duty for foundry auxiliary preparations
Read from the UK Trade Tariff on 30 September 2026, heading 3824 covers prepared foundry binders and chemical preparations not elsewhere specified. Foundry auxiliary preparations under 3824 99 65 00 carry 6% duty from China. The supplied record shows no anti-dumping or countervailing duty and no suspension for this line. The table describes slurry applications against the same candidate tariff line, rather than separate commodity lines.
The UK Trade Tariff attaches an import waste control to this line. For slurry supplied from China as waste, confirm the applicable requirements with your customs broker before shipment. Waste moved under notification controls cannot be shipped until the destination, dispatch and transit authorities have consented. The record also lists export measures for dangerous chemicals, waste, and goods for torture and repression; these are labelled as export measures.
Confirm the commodity code from the complete formulation, supplied condition and intended foundry use. The descriptions above apply only where the product meets the foundry auxiliary preparation category. A slurry, a separately supplied binder and a refractory powder should not automatically share a code. For the wider heading context, see foundry core binders.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Foundry auxiliary preparation: zircon prime-coat slurry | 3824 99 65 00 | 6% | None |
Specify the slurry and shell-building process
State whether the slurry is for the prime coat or backup coats, its refractory material and binder chemistry, and whether it arrives ready to use or needs mixing. Agree solids content, density, viscosity test method, particle distribution, mixing procedure and storage conditions. Identify the wax, stucco and alloy used in your trials.
Agree acceptance checks for wetting, drainage, coating uniformity, drying behaviour, green shell strength and fired shell performance. Trial the supplied formulation through your own dipping, drying, dewaxing and firing process. Retain an approved sample and require the supplier to flag changes to the refractory flour, binder or additives.
Before market supply, substances and mixtures must be correctly labelled and packaged. UK REACH registration applies to substances in mixtures, so check the constituent substances rather than treating the slurry trade name as the registration unit. Request the formulation information and an English safety data sheet for your review.
Worked duty example
Illustrative example, not a quote: A drum-packed zircon prime-coat slurry trial consignment; illustrative values under 3824 99 65 00, invoiced at £3,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £5,500. Duty at 6% is £330. Import VAT at 20% is charged on the customs value plus duty, £5,830, so it is £1,166. Import taxes total £1,496; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £330 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Batch identity: match drum labels, batch records and the certificate of analysis to the approved formulation; keep a retained sample.
Slurry condition: inspect for gel, contamination and hard sediment; measure density and viscosity after the agreed mixing procedure.
Shell trial: check wax wetting, drainage, coat adhesion and cracking through drying, dewaxing and firing.
Packing and documents: check seals, leaks, net contents, storage instructions and that labels and the safety data sheet describe the supplied formulation.
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What goes wrong
A slurry can meet a viscosity check yet build an unsuitable shell. Changed particle distribution or binder chemistry can alter drainage, drying and strength. Hard sediment, gel or contamination can make the delivered batch behave differently from the approved sample.
Avoid approving a batch from appearance alone. Compare measurements using the agreed method and run a shell trial before releasing it into production. Record defects against the batch and retain the affected material for investigation. Use the quality inspection guide to organise the inspection brief.
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 ceramic shell slurry from China?
The supplied tariff record shows 6% for foundry auxiliary preparations under 3824 99 65 00, with no anti-dumping or countervailing duty and no suspension. Confirm that your formulation fits this line.
Can I approve ceramic shell slurry from its viscosity alone?
No. Compare solids content, density, particle distribution and mixing behaviour, then trial wetting, drying, dewaxing and firing in your shell-building process.
Does UK REACH apply to a ceramic shell slurry mixture?
Registration applies to constituent substances in mixtures. Review the formulation and check each substance's registration position rather than relying on the slurry's trade name.
What should I check when the slurry arrives?
Match batch documents, inspect seals and leaks, check for gel and hard sediment, then measure the mixed slurry and build a trial shell against the approved sample.