Sourcing dimethyl methylphosphonate from China

Dimethyl methylphosphonate: 6% duty

Read from the UK Trade Tariff on 1 October 2026, dimethyl methylphosphonate falls under 2931 41 00 00 within heading 2931, other organo-inorganic compounds. The supplied tariff record gives 6% duty for goods from China, with no listed anti-dumping or countervailing duty and no suspension. The buying formats in the table repeat this single commodity line.

The UK Trade Tariff attaches an export waste control to this line. The importer should confirm its relevance with their customs broker, particularly for recovered material or rejected stock intended for return. The supplied record identifies an export measure; it does not establish the requirements for importing chemical waste from China.

Confirm the commodity code using the chemical identity and full composition, particularly if the supplier offers a diluted or blended product. For other products within the wider heading, see phosphonate water treatment chemicals.

Specify identity, purity and water content

Specify dimethyl methylphosphonate by its full chemical name rather than accepting a generic phosphorus additive description. Agree purity, water content, acidity, colour and impurity limits with the factory. Ask for the analytical methods, a batch certificate of analysis and a retained sample. State whether the order is neat material or a formulation.

Dimethyl methylphosphonate is listed among Chemical Weapons Convention Schedule 2 precursors. Importing any quantity falls within declaration obligations to the UK National Authority. Agree who will manage the declaration and record the quantities imported before placing the order.

Check UK REACH registration arrangements when annual imports reach one tonne or more. Before supplying the product, check that its labels and packaging meet the applicable classification, labelling and packaging rules. Request an English safety data sheet for your technical review.

Worked duty example

Illustrative example, not a quote: Illustrative order: one tonne of dimethyl methylphosphonate in drums under 2931 41 00 00, invoiced at £4,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £6,500. Duty at 6% is £390. Import VAT at 20% is charged on the customs value plus duty, £6,890, so it is £1,378. Import taxes total £1,768; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £390 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: match the purchase specification, drum labels and batch certificate to dimethyl methylphosphonate.

Analysis: compare independent purity, water content and acidity results with the agreed limits and methods.

Packaging: inspect drum closures, seals, leakage and external contamination before accepting the shipment.

Traceability: reconcile batch references and received quantities with supplier records and the information prepared for the chemical declaration.

What goes wrong

A generic additive description can conceal a different chemical or a blend. A purity result alone can also leave water content and acidity unresolved. Treat missing analytical methods, inconsistent batch references and unexplained differences from the approved sample as reasons to hold the batch for investigation.

A small order still needs attention to the chemical declaration. Do not treat the tariff record as the complete compliance check. Resolve declaration arrangements, registration coverage and label discrepancies before shipment or supply, and keep leaking drums separate while arranging an assessment.

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.