Sourcing guanidine carbonate from China
Guanidine carbonate provisionally falls under a residual line carrying 0% UK duty on goods from China, with no duty range within that line. GB importers should confirm applicable chemical classification, labelling and packaging duties with HSE before placing chemicals on the market. Confirm the substance and tariff controls before shipment. Cambridge China Bridge sources guanidine carbonate.
Zero duty on the provisional residual line
Read from the UK Trade Tariff on 1 October 2026, heading 2925 covers carboxyimide-function and imine-function compounds and their derivatives and salts. The supplied data does not name guanidine carbonate separately. The candidate residual line, 2925 29 00 90, carries 0% duty for goods from China, with no listed anti-dumping or countervailing duty and no suspension.
The UK Trade Tariff attaches Veterinary control, Export control on dangerous chemicals and Export control - Waste to this line. The importer should confirm the requirement for the actual Chinese-origin consignment with their customs broker. Do not assume these markers establish that synthetic guanidine carbonate needs veterinary certification. The named suspension for aminoguanidinium hydrogen carbonate concerns a different substance.
Confirm the chemical identity, composition and commodity code before ordering. The table shows purchasing descriptions against the same provisional residual line, rather than separate tariff subdivisions. For wider heading context, see guanidine hydrochloride.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Guanidine carbonate, industrial grade, subject to classification confirmation | 2925 29 00 90 | 0% | None |
Specify carbonate identity and assay
Write guanidine carbonate explicitly in the purchase specification and request the supplier's chemical identity documentation. Do not accept a quotation that substitutes guanidine hydrochloride or aminoguanidinium hydrogen carbonate. Agree the intended process, assay method, whether results are reported on a dry basis, moisture, insoluble matter, chloride, appearance and particle size.
Request a batch certificate of analysis and a retained sample. Agree sealed inner packaging, closure integrity and batch identification. Trial the sample in your actual process before accepting a production batch; a supplier's grade name alone does not define suitability.
GB importers should confirm applicable classification, labelling and packaging duties with HSE before placing substances and mixtures on the market. Classification and labelling must be carried out by someone with scientific competence. Review UK REACH responsibilities before ordering, and obtain a safety data sheet where the chemical is hazardous and supplied for workplace use.
Worked duty example
Illustrative example, not a quote: Illustrative order: 15 tonnes of industrial-grade guanidine carbonate under 2925 29 00 90, invoiced at £21,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £23,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £23,500, so it is £4,700. 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 the purchase specification, certificate of analysis, safety data sheet and container labels to guanidine carbonate.
Batch results: check assay basis, moisture, chloride and insoluble matter against the agreed specification; retain a traceable sample for independent testing.
Packaging: inspect seals, liners and closures for tears, dampness, leakage and contamination before accepting delivery.
Powder condition: compare colour, particle size, caking and dissolution behaviour with the approved sample and agreed acceptance criteria.
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What goes wrong
A carbonate order can fail when the supplier quotes a different guanidine salt, reports assay on a different basis or supplies powder that cakes and dissolves poorly in the buyer's process. An attractive assay result does not resolve excessive moisture, chloride or insoluble residue. Agree the test methods and acceptance criteria before production.
Generic certificates and mismatched batch labels weaken traceability. Record discrepancies on arrival and hold affected material pending investigation. A zero tariff rate does not resolve chemical supply duties or the tariff's control markers.
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 guanidine carbonate from China?
The candidate residual line 2925 29 00 90 carries 0% duty in the supplied tariff data, with no listed anti-dumping or countervailing duty. Confirm classification for your actual product.
Is guanidine carbonate the same as guanidine hydrochloride?
They are different salts. Specify carbonate explicitly and check the supplier's identity documents, labels and batch certificate before accepting a sample or shipment.
What should a guanidine carbonate certificate of analysis show?
Ask for batch identity, assay and its reporting basis, moisture, chloride, insoluble matter and the agreed test methods. Match the results to your purchase specification.
Do I need a safety data sheet for guanidine carbonate?
A safety data sheet is required if the chemical is hazardous and supplied for use at work. Check that it describes the actual material; obtain a competent classification review before supply.