Sourcing sodium trimetaphosphate from China

4% duty on sodium trimetaphosphate

Read from the UK Trade Tariff on 1 October 2026, heading 2835 covers phosphinates, phosphonates, phosphates and polyphosphates. Sodium trimetaphosphate belongs within other polyphosphates, code 2835 39 00 00, carrying 4% duty on goods from China. The supplied facts list no anti-dumping or countervailing duty and no suspension for this line.

The tariff attaches import and export waste controls. Confirm their applicability with your customs broker if the shipment involves recovered, discarded or off-specification material. For waste subject to notification, shipment requires consent from the competent authorities of destination, dispatch and transit. Confirm the applicable route for a shipment from China before dispatch.

Confirm the commodity code using the chemical identity, composition and intended supply form. The table repeats the same tariff line for different purchasing specifications; these are not separate tariff subdivisions. For the wider heading, see sodium hexametaphosphate.

Specify identity, purity and process performance

Name sodium trimetaphosphate explicitly on the enquiry, contract and batch certificate. Do not accept a description that says only sodium phosphate or metaphosphate. Ask the laboratory to confirm identity and distinguish it from sodium hexametaphosphate and sodium tripolyphosphate. Agree assay, moisture, insoluble matter, particle size and impurity limits, with named test methods.

State the intended process and agree a sample trial using your own formulation and operating conditions. Ask for a batch certificate of analysis and a safety data sheet. Confirm with HSE whether your annual imports require a UK REACH position; registration is assessed per substance and legal entity.

Worked duty example

Illustrative example, not a quote: Illustrative trial order: one tonne in 25 kg bags; illustrative whole-pound FOB and freight values under 2835 39 00 00, invoiced at £2,000 free on board, with £2,000 of freight and insurance to the UK. The customs value is £4,000. Duty at 4% is £160. Import VAT at 20% is charged on the customs value plus duty, £4,160, so it is £832. Import taxes total £992; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £160 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Identity: check that the bag label, purchase order and certificate name sodium trimetaphosphate, and independently verify the supplied material.

Analysis: check batch-specific assay, moisture, insolubles and agreed impurities against the contract, including the analytical methods and reporting basis.

Packing: check liners, seals, pallet protection and signs of water ingress, caking or contamination; compare received weights with the packing list.

Traceability: match bag batch markings to the certificate and retained sample, and review the proposed supply label with your chemical adviser. Arrange quality inspection against the written specification.

What goes wrong

A broad phosphate description can conceal a different compound, while a total phosphate result alone does not establish sodium trimetaphosphate identity. Moisture, caking and particle-size changes can affect handling and process consistency. A generic certificate may describe a typical product rather than the delivered batch.

Approve an identified sample, agree acceptance tests and retain a comparison sample. Hold material with mismatched identity, damaged packaging or missing batch evidence pending investigation. Do not treat a supplier's food-grade claim as confirmation that your intended food use is permitted; resolve that use separately before ordering.

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.