Sourcing Benzisothiazolinone from China
Benzisothiazolinone from China has 6% UK duty, with a conditional suspension to 0%. Confirm eligibility against the mixture exclusion. For biocidal supply, check the active substance's regulatory status and the supplier listing for the intended product type. Cambridge China Bridge sources benzisothiazolinone.
Benzisothiazolinone duty and suspension
Read from the UK Trade Tariff on 1 October 2026, heading 2934 covers nucleic acids and other heterocyclic compounds. Its named benzisothiazolinone line, 2934 20 80 25, describes CAS 2634-33-5 as powder with purity by weight of 95% or more, or an aqueous mixture containing 20% or more by weight. Only this named line in the supplied facts specifically describes benzisothiazolinone.
The Chinese-origin line carries 6% duty and an autonomous suspension to 0%, with no anti-dumping or countervailing measure recorded. The suspension footnote excludes mixtures, preparations and multicomponent products containing the substance. Do not assume the aqueous description guarantees suspension eligibility. The snapshot also attaches a waste export control; ask your customs broker to confirm its relevance to the transaction.
Give your broker the chemical identity, full composition, physical form and assay report. Confirm the commodity code and suspension eligibility before shipment, especially for formulated preservatives. For neighbouring substances, see the wider heterocyclic compounds guide.
| Goods | Commodity code | Duty | Anti-dumping or countervailing duty on China |
|---|---|---|---|
| Benzisothiazolinone powder, purity ≥95%; aqueous mixture, active content ≥20% | 2934 20 80 25 | 6% | None |
Specify the benzisothiazolinone grade and use
Specify CAS 2634-33-5, powder or aqueous form, and whether assay is reported on an as-supplied or dry basis. Agree the assay method, impurity profile and moisture specification. For aqueous material, request the full formulation, including solvents, stabilisers and other active ingredients, and agree acceptable appearance, pH and sediment.
Describe whether you are buying a formulation ingredient or a product supplied for biocidal use. For a biocidal product, active-substance status determines the route to market. Check the intended product type and the substance or product supplier's GB Article 95 listing before ordering. A batch analysis certificate does not answer these regulatory questions.
Chemical classification is the supplier's responsibility, including the importer. Request an English safety data sheet for the actual composition; hazardous chemicals supplied for workplace use require one. Confirm with HSE whether your annual substance imports require UK REACH registration and whether an only-representative arrangement is applicable; consult the wider guide when preparing that enquiry.
Worked duty example
Illustrative example, not a quote: Illustrative: 5 tonnes of benzisothiazolinone powder; values are not a quotation under 2934 20 80 25, invoiced at £15,000 free on board, with £1,500 of freight and insurance to the UK. The customs value is £16,500. Duty at 6% is £990. Import VAT at 20% is charged on the customs value plus duty, £17,490, so it is £3,498. Import taxes total £4,488; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £990 of duty. The import duty and VAT guide explains each step.
Inspection checklist
Identity: match the chemical name, CAS number, batch number and physical form across the label, purchase specification and certificate of analysis.
Assay: independently check active content using the agreed method and reporting basis; compare the impurity profile with the approved sample.
Condition: inspect powder for moisture and caking; inspect aqueous material for separation, sediment and changes in appearance or pH.
Packing and documents: check seals, leaks, container condition and batch traceability; compare the safety data sheet with the supplied formulation.
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What goes wrong
A powder assay reported on a dry basis can be mistaken for the as-supplied result. An aqueous preservative may contain undeclared additives or another active ingredient. These differences can affect your formulation and the customs assessment. Agree the reporting basis and composition before approving the sample, then compare the delivered batch against them.
Another failure is treating a chemical analysis certificate as proof that a biocidal product can be supplied. Check the regulatory route separately. Keep suspension eligibility separate from the commodity description too: the named line includes aqueous material, while its suspension footnote excludes mixtures.
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 benzisothiazolinone from China?
The supplied tariff snapshot gives 6% for 2934 20 80 25, with a conditional suspension to 0%. No anti-dumping or countervailing measure is recorded. Confirm the suspension conditions before claiming relief.
Does aqueous benzisothiazolinone qualify for the duty suspension?
Do not assume so. The line describes aqueous mixtures with at least 20% active content, but the suspension footnote excludes mixtures and preparations. Ask your broker to assess the full composition.
Can I sell imported benzisothiazolinone as a biocidal product?
Check the active-substance status and regulatory route for the intended product type, plus the substance or product supplier's relevant Article 95 listing. Chemical identity and assay alone do not settle market access.
What documents should I request from the factory?
Request a batch certificate of analysis, full composition, assay method and reporting basis, an English safety data sheet and batch-linked labels. For biocidal use, also request evidence supporting the supplier listing.