Sourcing foundry core binders from China

Duty on synthetic-resin core binders

Read from the UK Trade Tariff on 16 October 2026, heading 3824 includes prepared binders for foundry moulds or cores. The supplied synthetic-resin binder line, 3824 10 00 10, carries 6% duty for goods from China, with no listed anti-dumping or countervailing duty and no suspension. The supplied facts contain only this dedicated foundry-binder line, so the table lists it without adding unrelated chemicals.

The tariff attaches an import waste control and export entries for waste and goods for torture and repression. Waste shipment controls apply only where the material is waste. For a shipment from China to England subject to notification controls, the exporter starts the consent application with the dispatch authority. Ask your customs broker to confirm the attached controls against the actual goods and destination.

Confirm the commodity code using the formulation and intended foundry use, including whether separately supplied hardeners are covered by the binder description. For other products within this heading, see concrete admixtures and dry-mix mortars.

Specify the binder and curing process

Specify resin chemistry, sand type, curing process, compatible hardener or catalyst, mixing sequence, addition rate, viscosity, solids content and storage conditions. Agree how to measure working time, stripping time and core strength using your own sand and equipment. Ask for batch analysis, a safety data sheet and a retained sample.

For Great Britain, the importer must arrange chemical classification, labelling and packaging before placing the binder on the market. Check UK REACH registration responsibilities for the constituent substances, since registration applies to substances in mixtures. Establish who covers those duties before ordering.

Worked duty example

Illustrative example, not a quote: Illustrative order: 5 tonnes of synthetic-resin foundry core binder under 3824 10 00 10, invoiced at £26,000 free on board, with £2,400 of freight and insurance to the UK. The customs value is £28,400. Duty at 6% is £1,704. Import VAT at 20% is charged on the customs value plus duty, £30,104, so it is £6,020.80. Import taxes total £7,724.80; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £1,704 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match drum labels, batch analysis and safety data sheets to the approved formulation and batch.

Condition: inspect seals, leaks, contamination, separation and remaining shelf life; compare viscosity and solids with the agreed specification.

Core trial: mix with the agreed sand and hardener, then check working time, stripping behaviour, strength and breakdown after casting.

Supply documents: check classification, label accuracy and packaging suitability before release to customers; use the quality inspection guide to prepare the inspection brief.

What goes wrong

A binder can pass a viscosity check but produce weak cores with the buyer's sand. An incompatible hardener, altered resin formulation or unsuitable storage can change curing behaviour. Watch for premature setting, cores breaking during handling, difficult stripping and poor breakdown after casting.

Approve a trial using the complete binder system and your production conditions. Compare arrival samples with retained approval samples and hold batches that fail the agreed checks. Investigate formulation and storage differences before changing the addition rate.

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.