Sourcing Metaphosphoric Acid from China

Metaphosphoric acid duty and classification

Read from the UK Trade Tariff on 2 October 2026, heading 2809 covers diphosphorus pentaoxide, phosphoric acid and polyphosphoric acids, whether or not chemically defined. For metaphosphoric acid, the relevant supplied line is 2809 20 00 00. It carries 0% duty for goods from China, with no listed anti-dumping or countervailing duty and no suspension.

The UK Trade Tariff attaches import and export waste controls to this line. For waste imported into England under notification controls, the exporter must apply to the competent authority in the dispatch country for consent. For a shipment from China, confirm the applicable requirements with your customs broker before dispatch, particularly if the material is spent or supplied for recovery.

Only the relevant tariff line is shown because the supplied facts contain no separate metaphosphoric-acid subdivisions. Give your broker the composition, physical form and intended use, then confirm the commodity code. See the polyphosphoric acid guide for the wider product family.

Specify the acid, assay and laboratory use

Specify metaphosphoric acid by chemical identity and composition, rather than accepting a quotation headed simply phosphoric acid. Agree the physical form, assay basis, analytical method, water content, insoluble matter and limits for impurities that could affect your application. Ask the supplier to disclose any stabiliser or other ingredient.

For laboratory use, approve a sample in your actual analytical method. Agree dissolution conditions and acceptable clarity, and require a batch certificate of analysis tied to the shipped containers. Specify sealed packaging and storage instructions suitable for your handling arrangements.

Check whether importing this substance requires UK REACH registration. Everyone in the supply chain is responsible for correct labelling and packaging before chemicals are placed on the market. A safety data sheet is required where a hazardous chemical is supplied for use at work.

Worked duty example

Illustrative example, not a quote: Illustrative order: 25 kg of laboratory-grade metaphosphoric acid under 2809 20 00 00, invoiced at £2,600 free on board, with £2,000 of freight and insurance to the UK. The customs value is £4,600. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £4,600, so it is £920. 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, container description, composition and batch certificate; investigate any substitution with another phosphoric acid product.

Assay: compare the batch result and test method with the agreed assay basis; independently test a retained sample where the application depends on purity.

Performance: check dissolution and solution clarity under the agreed preparation conditions, then trial the sample in the intended laboratory method.

Packing: inspect seals, closures, moisture damage, contamination and lot markings; compare the labels and safety data sheet with the supplied composition.

What goes wrong

A purchase can fail when the supplier uses phosphoric acid as a loose description, quotes an assay on a different basis, or provides a certificate that cannot be traced to the delivered lot. A material that passes a general assay may still give unacceptable results in your analytical method.

Damaged seals, moisture ingress and undisclosed ingredients can also make a delivery unsuitable. Agree the acceptance tests before ordering, keep a reference sample and investigate discrepancies before using the lot. Our quality inspection guide explains how to turn the specification into inspection checks.

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.