Sourcing honeycomb carbon blocks from China

Duty and classification for honeycomb carbon

Read from the UK Trade Tariff on 2 October 2026, heading 3802 covers activated carbon, activated natural mineral products and animal black. The supplied lines all carry 0% duty for China, with no anti-dumping or countervailing measure shown. No suspension is shown for the activated-carbon lines. The suspension for a specified diatomaceous-earth filter aid is separate from honeycomb carbon. Import VAT is normally 20%; see import duty and VAT.

Use 3802 10 00 90 as a starting point for checking ordinary activated-carbon blocks. The specialised chemically activated vapour-recovery line depends on its stated technical criteria. The table includes powder feedstock and other materials to distinguish them from finished blocks. Send the composition, manufacturing description and intended use to your broker to confirm the commodity code. See the wider activated-carbon guide for other forms.

The UK Trade Tariff attaches import and export waste controls to these lines. In England, waste shipment controls apply only where the material is waste. For blocks supplied from China, ask your customs broker to confirm the applicable requirement, particularly for spent or regeneration-bound material. Do not assume that a product description settles waste status; confirm the route with the relevant waste authority before shipment.

Specify the honeycomb and the adsorption duty

Specify whether the block is formed from activated carbon with a binder or is a carrier coated with carbon. Request the carbon feedstock, binder composition, carbon loading, activation method and any impregnation. Agree external dimensions, channel geometry, wall thickness, airflow direction and how the block seals into its housing. Keep an approved sample and a drawing tied to the ordered grade.

Define the target vapour, inlet concentration, airflow, temperature and humidity for an adsorption trial. Agree pressure-drop and breakthrough acceptance criteria under those conditions. Compare the finished block rather than relying only on an iodine-number result for its carbon powder. If buying a water-resistant grade, agree how wet exposure and subsequent strength will be tested.

Before importing a substance you have not previously imported, consider whether UK REACH registration is required. Ask a chemical compliance adviser to assess the block's composition and supply arrangement. For freight, obtain the exact grade's self-heating report and have the carrier confirm its dangerous-goods classification; the wider guide explains activated carbon's transport issue.

Worked duty example

Illustrative example, not a quote: 20 tonnes of palletised honeycomb activated carbon blocks, illustrative only under 3802 10 00 90, invoiced at £30,000 free on board, with £2,500 of freight and insurance to the UK. The customs value is £32,500. Duty at 0% is £0. Import VAT at 20% is charged on the customs value plus duty, £32,500, so it is £6,500. 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: match carton labels, batch records and the analysis certificate to the approved composition and grade. Retain a sample from the delivered batch.

Geometry: measure block dimensions, inspect channel openings and check fit in the intended housing. Look for bowed faces, blocked passages and damaged sealing edges.

Strength and packing: inspect for through-cracks, crushed corners, loose powder and damp packaging. Compare handling strength and any agreed wet-exposure result with the approved sample.

Performance: check moisture and adsorption results against the purchase specification. Test pressure drop and breakthrough using the agreed airflow, target vapour and humidity.

What goes wrong

Blocks can arrive intact yet perform poorly because the carbon loading, binder or impregnation differs from the approved sample. An iodine number alone does not demonstrate removal of the buyer's target vapour. Channels obstructed by binder and poorly fitting edges can also undermine the intended airflow through the carbon.

Weak walls crack during transport, leaving dust and gaps in the installed bed. A water-resistant sample may be followed by a different production grade, while damp blocks can distort weight comparisons. Agree batch testing and protective packing before production, and record arrival defects before installation.

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.