Sourcing laboratory syringe filters from China

UK duty and syringe filter classification

Heading 8421 covers centrifuges and filtering or purifying apparatus for liquids or gases. For complete laboratory syringe filters, consider the other-liquid-filtering lines against the actual construction. The fluoropolymer line specifies membrane thickness, not pore size. The parts rows apply only where the imported goods qualify as parts; they are not alternative codes for every complete filter. For the reverse route, see UK filtration equipment exports to China.

Read from the UK Trade Tariff on 30 September 2026, every supplied line carried 0% duty for goods from China. The supplied facts record no anti-dumping or countervailing measures, suspensions or attached import controls. Import VAT is normally 20%; see import duty and VAT.

Give your broker the membrane and housing materials, membrane thickness, intended liquid and whether the shipment contains complete filters or separate parts. Confirm the commodity code before shipment. For the wider filtration context, see laboratory filter papers.

Specify the membrane and sample application

Specify membrane chemistry, pore size, filter diameter, housing material, connector type and sterile or non-sterile presentation. Describe the solvent, sample and analytical method. Agree checks for sample recovery, extractables, retained volume and flow using your actual application. A membrane that passes liquid can still adsorb the substance you need to measure.

Agree packaging, batch identification and the evidence supporting any sterility claim. General laboratory products are not diagnostic devices unless their characteristics and the manufacturer's intended use bring them within diagnostic examination. If the filter qualifies as a medical device, registration with the medicines regulator is required before placement on the Great Britain market. Resolve diagnostic intended use before approving the label.

Worked duty example

Illustrative example, not a quote: Illustrative order of 1,000 packs of laboratory syringe filters; classification assumed confirmed under 8421 29 80 90, invoiced at £38,000 free on board, with £2,000 of freight and insurance to the UK. The customs value is £40,000. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £40,000, so it is £8,000. With no duty, the only import tax is the VAT, which a VAT-registered importer can usually reclaim. The import duty and VAT guide explains each step.

Inspection checklist

Identity: compare membrane, pore-size marking, housing and connectors with the approved specification; do not identify membrane chemistry by housing colour alone.

Function: check connector fit, leakage and flow with the agreed liquid and pressure; inspect for cracked housings and faulty membrane seals.

Sample quality: compare filtered samples and blanks for contamination and loss of the target substance against the agreed acceptance criteria.

Packaging: check pack contents, batch references and seals on arrival; reconcile sterile-labelled stock with the agreed supporting records. Use quality inspection to organise checks.

What goes wrong

A substituted membrane can change solvent compatibility or sample recovery while the housing looks identical. Poor sealing can let liquid bypass the membrane, and extractables can contaminate an analytical blank. Approve application-tested samples and require notification before changes to membrane, housing or assembly.

A clean-looking pack does not demonstrate sterility. Keep sterile and non-sterile specifications separate, and investigate damaged seals before releasing stock. Generic certificates also do not show how the ordered filter performs with your sample. For sterilisation equipment sourcing, see our steam autoclave procurement guide.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For machinery and equipment, see machinery imports.