Sourcing Carbohydrazide from China

Carbohydrazide duty and classification

Read from the UK Trade Tariff on 6 November 2026, heading 2928 covers organic derivatives of hydrazine or hydroxylamine. For unformulated carbohydrazide, confirm the residual code 2928 00 90 90 with your broker. The table shows buying specifications against that same residual line, rather than separate tariff subdivisions.

The supplied residual line carries 6% duty for goods from China and no anti-dumping or countervailing measure. Its 0% suspension is restricted to named substances; the supplied wording does not name carbohydrazide. The tariff attaches Home Office controlled-drug import and export controls, dangerous-chemical export control and waste export control. Ask your customs broker to confirm their applicability to your exact product and shipment.

Provide the chemical identity, composition, assay and intended use when confirming your commodity code. Do not assume a formulated solution has the same classification. See the wider oximes and hydrazine derivatives guide and the import duty and VAT guide.

Specify carbohydrazide identity and assay

Specify carbohydrazide by its chemical identity, not just a supplier's water-treatment trade name. Agree assay, whether results are on a dry or as-received basis, moisture, appearance, insoluble matter and relevant impurity limits. State the test methods, packaging, storage instructions and certificate of analysis required for each batch.

For Great Britain, check your UK REACH route against annual substance volume. HSE says a GB-based entity importing a substance at or above 1 tonne per year must submit a registration. GB importers must meet chemical classification, labelling and packaging duties before placing goods on the market. A hazardous chemical supplied for workplace use needs a safety data sheet.

Worked duty example

Illustrative example, not a quote: Illustrative order: 1 tonne of technical-grade carbohydrazide under 2928 00 90 90, invoiced at £3,500 free on board, with £2,500 of freight and insurance to the UK. The customs value is £6,000. Duty at 6% is £360. Import VAT at 20% is charged on the customs value plus duty, £6,360, so it is £1,272. Import taxes total £1,632; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £360 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match the purchase order, batch certificate, safety data sheet and container labels to carbohydrazide and the agreed composition.

Assay: independently test a representative batch sample using the agreed method; compare moisture and assay on the same reporting basis.

Condition: inspect for damp material, hard caking, unexpected colour and visible contamination; compare with the approved sample.

Packing: check seals, liners, leakage, batch identification and label accuracy. Record arrival condition before opening. Use the quality inspection guide to brief the inspection.

What goes wrong

A dry-basis assay can look acceptable while the delivered material contains more moisture than agreed. A certificate for a different batch cannot establish the quality of your delivery. Check batch identity and reporting basis before accepting results, and hold material with damaged packaging or unexplained contamination for investigation.

Another mistake is claiming the residual line's suspension without matching a named substance. Chemical-registration coverage and the tariff's Home Office flag also need checking before shipment. The Home Office says businesses importing controlled drugs or precursor chemicals need a licence; ask your broker to establish whether your carbohydrazide shipment falls within that requirement.

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.