Sourcing leather machinery seals from China

UK duty on leather machinery seals

Read from the UK Trade Tariff on 1 October 2026, heading 4205 covers other articles of leather or composition leather. Its other technical-use line, 4205 00 19 00, carries 2% duty for goods from China. The supplied tariff record lists no anti-dumping or countervailing duty and no suspension for this line.

The UK Trade Tariff attaches CITES, cat and dog fur, and seal-product import controls to this line. Check the leather species with your customs broker: listed species require the relevant CITES documentation, and cat and dog fur products are banned. The animal-seal exemption for traditional indigenous hunts requires a seal catch attestation. For a China shipment containing animal-seal material, confirm eligibility and documents with your broker before ordering; a machinery seal's name does not establish its animal origin.

The table shows seal designs within the same technical-use line, rather than separate tariff subdivisions. Confirm the commodity code using the material, drawing and intended use, particularly for assemblies containing other materials. See our leather washers guide for related goods within the wider heading.

Specify the leather, lip profile and working fluid

Send a sectional drawing showing the bore, shaft, groove, seal height, lip direction and dimensional tolerances. State whether measurements apply to dry or conditioned leather. Identify the machine, working fluid, pressure, temperature and movement, then ask the factory to explain its proposed leather and treatment against those conditions.

Specify animal species, tanning method, leather thickness, impregnation and any backing or reinforcement. Approve a sample in the actual material and trial it in the intended housing and fluid before bulk production. Confirm applicable UK REACH restrictions on dimethylfumarate and chromium VI with the relevant authority, particularly where leather contacts skin. Arrange relevant material checks through testing and certification.

Worked duty example

Illustrative example, not a quote: Illustrative order: 2,000 leather cup seals for machinery under 4205 00 19 00, invoiced at £10,000 free on board, with £700 of freight and insurance to the UK. The customs value is £10,700. Duty at 2% is £214. Import VAT at 20% is charged on the customs value plus duty, £10,914, so it is £2,182.80. Import taxes total £2,396.80; a VAT-registered importer can usually reclaim the VAT, so the lasting cost is the £214 of duty. The import duty and VAT guide explains each step.

Inspection checklist

Material: compare the cut edge, leather structure, thickness and treatment with the approved sample; match the species declaration and material reports to the batch.

Profile: measure the bore, outside diameter, height and lip geometry in the agreed conditioning state; check concentricity and the fit in the intended housing.

Condition: look for cuts, loose fibres, hard patches, cracked lips, uneven impregnation and mould; check that packing has not flattened the sealing edge.

Performance: trial sampled seals with the agreed fluid and operating conditions; record leakage, drag and changes in shape against agreed acceptance criteria. Use quality inspection to define the checks before dispatch.

What goes wrong

A seal copied from a worn part can reproduce the wear rather than the intended profile. Dry measurements can also hide a poor fit after conditioning. Uneven thickness, a reversed lip or a damaged sealing edge may let a part fit the housing while still leaking.

An unspecified impregnation or leather substitution can change swelling, flexibility and drag in service. Keep the approved material and treatment in the purchase specification, retain batch samples, and agree how to investigate failures before reordering.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For own-brand ranges, see sourcing for brands.