Sourcing unmounted optical waveplates from China

Duty on unmounted waveplates

Heading 9001 covers unmounted optical elements, excluding glass elements that are not optically worked. For unmounted optical waveplates, check the other optical elements line, 9001 90 00 90. The table shows product variants under that same tariff line, rather than separate commodity codes.

Read from the UK Trade Tariff on 30 September 2026, the supplied line carried 0% duty on goods from China, with no listed anti-dumping or countervailing duty, suspension or import control. This is the rate for the waveplate line, rather than the duty range across the whole heading.

Give your customs broker the material, optical working, construction and confirmation that the waveplate is unmounted. Confirm the commodity code before shipping. See the optical polarising sheets guide for the wider heading.

Specify retardance and operating conditions

Specify the required retardance, design wavelength or wavelength band, material and construction. Distinguish a true zero-order plate from a compound assembly or multi-order plate. Record the operating temperature, incidence angle, clear aperture, diameter, thickness and dimensional tolerances.

Agree retardance tolerance across the clear aperture, transmitted wavefront quality, surface finish, anti-reflection coating and the method of identifying the fast axis. For laser use, request damage-test evidence matched to your pulse conditions. Ask for measurement reports tied to the supplied batch.

For selling in Great Britain, assess the intended product and application before accepting a supplier's conformity claim. Official guidance notes that some sectors have rules outside the UKCA and CE regimes. Obtain material information for a UK REACH assessment: Candidate List substances in imported articles can trigger notification duties under specified conditions.

Worked duty example

Illustrative example, not a quote: Illustrative batch of unmounted quartz waveplates for a laboratory equipment business under 9001 90 00 90, invoiced at £15,000 free on board, with £800 of freight and insurance to the UK. The customs value is £15,800. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £15,800, so it is £3,160. 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

Retardance: measure at the agreed wavelength, temperature and incidence angle, and compare results across the clear aperture with the order.

Axis: verify that the fast-axis identification agrees with optical measurement and remains identifiable after unpacking.

Surfaces: inspect for scratches, coating blemishes, edge chips, contamination and separation in compound plates.

Packing and records: check individual protective packs, batch identity, dimensions and matching test reports. Arrange quality inspection around optical measurements as well as visual checks.

What goes wrong

A plate can look correct but deliver the wrong retardance at the buyer's wavelength. An ambiguous construction description, inaccurate axis mark or report measured under different conditions can leave the component unsuitable for the optical assembly.

Coating defects, chipped edges, adhesive contamination and movement between compound layers are reasons to hold a batch for investigation. Agree measurement conditions and acceptance criteria before production, and compare arrival samples with the approved sample and batch report.

Cambridge China Bridge sources these products for UK businesses, checking the factory and the documents before shipment. See factory verification. For components and parts, see sourcing for manufacturers.