Sourcing Calcium Dithionite from China
Calcium dithionite from China carries 0% UK duty under 2831 90 00 00, with no anti-dumping or countervailing measure listed. Before supplying it in Great Britain, ensure correct chemical labelling and packaging, and settle the UK REACH registration position. Cambridge China Bridge sources calcium dithionite.
Calcium dithionite duty and waste controls
Read from the UK Trade Tariff on 29 September 2026, heading 2831 covers dithionites and sulphoxylates. Calcium dithionite falls within the other line, 2831 90 00 00. Goods from China carry 0% duty, with no anti-dumping or countervailing measure and no suspension listed. The supplied tariff has only one line relevant to calcium dithionite.
The tariff attaches import and export waste controls. Ask your customs broker to confirm their application to the consignment, particularly recovered or discarded material. For waste imported into England under notification controls, shipment can begin only after consent from the Environment Agency and the other competent authorities involved. Confirm the applicable procedure before arranging a waste shipment from China.
Confirm the identity, composition and presentation against the commodity code guidance, especially for formulated products. For the wider heading, see sodium dithionite sourcing. Budget separately for import VAT using UK import duty and VAT.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Calcium dithionite | 2831 90 00 00 | 0% | None |
Specify calcium identity and reducing performance
Name calcium dithionite explicitly in the purchase specification. Ask the factory to reconcile the chemical identity across its quotation, safety data sheet and batch certificate. Agree the supplied form, active assay, reducing-performance test, moisture, insolubles and relevant impurity limits. Require named test methods and results for the actual shipment batch.
Agree sealed packaging, storage instructions and an acceptance test using your own process. Obtain the safety data sheet; UK REACH governs safety data sheets. Before supply in Great Britain, ensure correct chemical labelling and packaging. Ask HSE or your customs broker to confirm the applicable UK REACH registration threshold and position for your imports. Registration is per substance and legal entity. See UK REACH for importers.
Worked duty example
Illustrative example, not a quote: 25 kg trial batch, illustrative only under 2831 90 00 00, invoiced at £2,000 free on board, with £300 of freight and insurance to the UK. The customs value is £2,300. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £2,300, so it is £460. 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
Identity: match calcium dithionite on the order, container labels, safety data sheet and batch certificate; investigate any sodium-product substitution.
Assay: have a laboratory check the shipment sample against the agreed active assay and reducing-performance method.
Condition: inspect seals, liners and containers for leakage, damage or signs of moisture ingress; follow the safety data sheet when sampling.
Traceability: match batch references and net weights to the packing list, and retain the certificate and inspection record.
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What goes wrong
Watch for quotations that describe only dithionite or hydrosulphite without identifying the calcium compound. A sodium product or an unspecified blend can undermine both the process trial and the customs description. Resolve identity before accepting a sample.
Other acceptance problems include assay below the contract, inconsistent reducing performance, damaged seals and certificates that cover a different batch. Agree sampling and rejection terms before shipment, then compare arrival results with the approved trial material.
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 calcium dithionite from China?
The supplied tariff reading gives 0% under 2831 90 00 00, with no anti-dumping or countervailing measure and no suspension listed.
Does calcium dithionite need UK REACH registration?
Ask HSE or your customs broker to confirm the applicable UK REACH registration threshold and settle the registration position before ordering. Registration is per substance and legal entity.
What should a calcium dithionite batch certificate show?
Ask for chemical identity, batch reference, active assay, reducing-performance results, moisture, insolubles and agreed impurities, with the test methods.
Why does the tariff show waste controls?
The supplied tariff attaches waste controls to this line. Ask your customs broker to confirm the consignment's requirements, particularly for recovered or discarded material.