Sourcing MBTS rubber accelerator from China

MBTS duty and the shared benzothiazole line

Heading 2934 covers nucleic acids and other heterocyclic compounds. Within it, 2934 20 20 00 names the disulphide used as MBTS, alongside mercaptobenzothiazole and its salts. This is the supplied tariff line relevant to MBTS. For the related accelerator and wider heading context, see the mercaptobenzothiazole guide.

Read from the UK Trade Tariff on 1 October 2026, this line carries 6% duty for goods from China. The supplied record lists no anti-dumping or countervailing duty and no suspension. It attaches an export control for waste. Waste shipment controls apply only where the material is waste; if buying discarded or recovered material, ask your customs broker to confirm the applicable requirements before shipment.

Give your broker the chemical identity, full composition, physical form and any oil or carrier treatment to confirm the commodity code. Do not assume a formulated accelerator preparation belongs under the same code as the named substance.

Specify the MBTS grade and rubber trial

Specify dibenzothiazyl disulphide explicitly rather than ordering by the accelerator abbreviation alone. Agree assay, residual mercaptobenzothiazole, melting range, moisture, ash and particle size, with the test method for each. State whether you want powder or granules and require disclosure of oil treatment, binders and other additives.

Approve a sample in your own rubber formulation. Compare dispersion, scorch behaviour and cure response against your existing material using the same mixing and curing conditions. Keep the approved sample and require notification before changes to composition or manufacturing route.

For imports into Great Britain, confirm with HSE which UK REACH registration responsibilities, supply-chain arrangements or exemptions apply to your planned imports of the substance. Importers have chemical classification responsibilities and must ensure correct labelling and packaging before placing chemicals on the market. A safety data sheet is required when a hazardous chemical is supplied for workplace use. Settle these checks before ordering.

Worked duty example

Illustrative example, not a quote: Illustrative order: 5 tonnes of MBTS rubber accelerator under 2934 20 20 00, 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 and batch references across the purchase specification, analysis certificate, safety data sheet and bag labels; distinguish MBTS from mercaptobenzothiazole.

Batch chemistry: check assay, residual mercaptobenzothiazole, moisture, ash and melting range against agreed methods and acceptance limits; arrange independent testing through testing and certification.

Physical form: examine particle size, granule consistency, dust and caking; compare dispersion and cure response with the approved sample.

Packing: check sealed liners, dry bags, pallet condition and readable batch labels; match hazard information to the assessed product and keep a retained sample.

What goes wrong

An order described only as rubber accelerator can leave room for substitution between MBTS, mercaptobenzothiazole and formulated blends. Undisclosed treatment or a different impurity profile can upset comparison with the approved sample. Moisture, caking and inconsistent particle size can also make handling and dispersion uneven.

Hold a suspect batch apart from approved stock while you compare documents, test results and rubber trials. Agree the evidence needed for release or replacement before paying the balance. A factory certificate alone does not resolve a mismatch between the delivered material and your specification.

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.