Sourcing sodium sesquicarbonate from China

Sodium sesquicarbonate: confirm the 4% line

Read from the UK Trade Tariff on 1 October 2026, heading 2836 covers carbonates and peroxocarbonates. The supplied facts do not name sodium sesquicarbonate separately. The candidate other-carbonates line, 2836 99 17 80, carries 4% duty for goods from China, with no anti-dumping or countervailing measure and no suspension recorded. The table includes comparison materials, not alternative declarations for the same product.

The UK Trade Tariff attaches an import control for waste to this line. Confirm its application with your customs broker, particularly for recovered or discarded material. If a shipment from China is waste subject to notification controls and enters England, it can start only after consent from the Environment Agency and the other competent authorities involved.

Give the broker the composition, manufacturing description and intended use to confirm the commodity code. Do not transfer the soda ash or percarbonate suspension to sodium sesquicarbonate. See the wider carbonate guide for those materials.

Specify identity, assay and powder behaviour

Order sodium sesquicarbonate by its full chemical name. Ask the factory to state the carbonate and bicarbonate content, hydration basis, assay method, moisture, insoluble matter, chloride and iron. Agree particle size and acceptable caking against a retained sample. A certificate reporting only total alkalinity leaves important differences unresolved.

Specify the intended industrial use, bag lining and batch traceability. Request a safety data sheet and a certificate of analysis for each batch. Confirm the applicable UK REACH requirements with the Health and Safety Executive; use the UK REACH guide before placing the order.

Worked duty example

Illustrative example, not a quote: Illustrative order: 20 tonnes of sodium sesquicarbonate, subject to code confirmation under 2836 99 17 80, invoiced at £22,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £24,500. Duty at 4% is £980. Import VAT at 20% is charged on the customs value plus duty, £25,480, so it is £5,096. Import taxes total £6,076; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £980 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: compare the bag name, purchase order and batch certificate; request laboratory confirmation of carbonate and bicarbonate content.

Assay: check the reporting basis and test methods, then compare moisture, insoluble matter and agreed impurities with the specification.

Condition: inspect for hard lumps, wet patches, contamination and torn liners; compare powder behaviour with the approved sample.

Traceability: match bag batch marks to certificates and sampling records. Set the sampling scope through the inspection guide.

What goes wrong

A supplier may offer soda ash, bicarbonate or a blend against an imprecise enquiry. A total-alkalinity result alone can conceal a composition mismatch. Ask for separate component results and an agreed hydration basis rather than accepting a generic carbonate certificate.

Damp packaging can leave powder difficult to discharge, while inconsistent particle size changes handling in your process. Record arrival condition before opening bags, retain labelled samples and compare independent results with the shipment certificate before releasing a disputed batch.

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.