Classify AI in practice: two composite goods, one decisive question

A customs broker can receive very different goods for classification on the same day. In this session, two arrived together:

• decorative paper impregnated with melamine resin;
• a decking board made of wood-plastic composite.

Commercially, the two have nothing in common. For customs classification, they share one difficulty. Each is made of more than one material, and the commercial description names the material that does not decide the classification. The paper is not necessarily classified as paper. The board that is 60% wood is not classified as wood.

Composite goods like these are classified through the General Rules of Interpretation (GRI). GRI 3(a) - the most specific description - cannot decide such cases: where each competing heading refers to part only of the materials in a composite product, the headings are regarded as equally specific. Classification therefore passes to GRI 3(b): the product is classified by the material that gives it its essential character. And essential character is not a question of weight alone - the quantity of a material is only one factor. What matters is also the role each material plays in what the product is and does.

The broker used a different Classify AI mode for each product. Quick mode does not classify: it searches the classification evidence - EU classification regulations, Binding Tariff Information (BTI) decisions, EU court judgments and the ECICS chemical database - and makes a suggestion based on what it finds. Finder mode is the automated classification tool: it works through the nomenclature and proposes a code with as few questions as possible, asking only when a legally decisive fact is missing.

Case 1, in Quick mode: when does impregnated paper stop being paper?

The product was entered into Quick as: "Decorative paper impregnated with thermosetting melamine resin, not fully cured, for coating wood-based boards in short-cycle hot presses."

The description points to Chapter 48, paper and paperboard. Whether the product belongs there depends on a physical test: has the impregnation gone so far that the sheet has lost the essential character of paper - the ability to bend without breaking? A lightly impregnated paper that remains flexible stays in Chapter 48, under heading 4811. A sheet so saturated that it has become hard and brittle, fracturing when folded, is classified in Chapter 39 as plastics, because the resin now gives it its essential character. The difference is not academic: 4811 59 00 is duty-free, while the plastics code carries a 6.5% conventional duty.

Because this is Quick, there are no questions - the user sees the evidence organised by source type, as in the screenshots above.

The BTI section separates the rulings into groups and explains why they differ. The closest matches by similarity concern boards produced from joined, consolidated layers of resin-impregnated paper - finished pressed laminates, different goods from the intermediate described. The ruling that matches the product is German decision DEBTI1450/25-1: papers impregnated with resin, coloured or printed, not self-adhesive, supplied in sheet or roll form, classified under 3921 90 49. Quick states the distinction expressly: the query describes an intermediate in a not-fully-cured state, not yet a laminate board, and the pressed-board rulings sit under other subdivisions of 3921 90.

The case-law section names the directly relevant judgment. In case T-304/25 (General Court, 10 June 2026), decorative paper impregnated with not-fully-cured melamine resin, imported for coating boards in short-cycle hot presses, had been declared under heading 4811 as duty-free paper; customs reclassified it under 3921 90 49 00 at 6.5%. The General Court, asked for the correct criteria, held that such a product falls under heading 3921 provided that the plastics give it its essential character - and pointed to the objective indicators: the resin predominated by quantity, the sheets were hard and brittle rather than flexible, and the resin, not the paper, delivered the product's use as a water- and heat-resistant coating. The final factual assessment remains with the national court, but the criteria are now set - and the curing state is not the test. Quick's suggestion tracks the judgment on exactly that point: the not-fully-cured state does not remove the product from Chapter 39 where the resin imparts the essential plastic character.

The chemical database adds one useful fact: the ECICS entry identifies the resin as melamine-formaldehyde, the polymer itself falling under heading 3909. That identification matters further down the tree, because the subdivisions within 3921 90 separate products by the type of resin.

Quick's suggestion: 3921 90 49 (TARIC 3921 90 49 00) for the impregnated paper in its pre-press, sheet or roll form - on the stated premise that the resin gives the sheet its essential character. The user makes the classification decision, and for this product that means confirming the physical facts on the actual goods: a sheet that is still flexible and keeps its paper character belongs under 4811 59 instead. But every source needed to examine and defend the classification is already on the screen.

Case 2, in Finder mode: the board that is mostly wood but classified as plastics

The product was entered into Finder as: "Decking board of wood-plastic composite, for outdoor terraces."

Wood-plastic composite decking typically contains around 60% wood fibres and 30% plastics. Weight alone would point to Chapter 44, wood. The classification points the other way - and here the question is settled, because a classification regulation settled it after member states' practice had diverged.

Finder asked no questions at all, and cited the governing source at the first step, as the screenshots show: Commission Implementing Regulation (EU) No 276/2013, which classifies a wood-plastic composite decking board - 60% waste wood fibres, 30% recycled HDPE, 10% additives - under CN code 3918 90 00 by GRI 1, 3(b) and 6. The reasoning is the essential-character rule at work: the wood fibres are only the filler; the plastic holds them together and gives the board its rigid, weather-resistant character. Finder also quoted the exclusion applied in the regulation - the Explanatory Notes to Chapter 44 exclude plates and strips of plastics containing wood flour as a filler from heading 4410 - and a Customs Code Committee conclusion (52nd meeting) confirming the approach.

Within Chapter 39, the analysis separated floor coverings (3918) from builders' ware (3925), and within heading 3918, vinyl chloride polymers (3918 10) from other plastics (3918 90). At TARIC level it excluded the civil-aircraft subdivision. The proposed code: 3918 90 00 90, supported by eight closely matching EBTI rulings on wood-plastic terrace boards issued in 2025 and 2026.

One fact remained open: the type of plastic binder. Instead of stalling or guessing silently, Finder stated its assumption - a polyolefin such as HDPE, as in virtually all wood-plastic decking - and stated the consequence if the assumption is wrong: a PVC binder would move the product to subheading 3918 10.

What the two cases have in common

In each case, the commercial description named the wrong starting point:

1. "Paper" - but where the resin gives the sheet its essential character, the code is in Chapter 39, not Chapter 48.
2. "Wood composite" - but the wood is only a filler, and the code is 3918 90 00, not Chapter 44.

In each case, GRI 3(b) decided the classification, and in each case it turned on the role of a material rather than its share of the product. Heavily impregnated paper that fractures on folding is defined by the resin. Wood fibres held together by plastic are a filler - so the plastic defines the board, even at 60% wood. Classify AI identified the decisive point in both cases and showed the evidence behind it - a General Court judgment delivered weeks earlier in one case, a binding classification regulation in the other - before suggesting a code.

The two modes did this differently, and the difference is the point. Quick put the organised evidence in front of the user, stated the premise its suggestion rests on, and left the conclusion to them. Finder classified automatically, and where one fact remained unknown it declared the assumption and the alternative code. In both cases the user could see not only the proposed code but also what the result rests on - and what would change it.

Why this workflow matters

Composite goods produce a large share of classification disputes, and the stakes are concrete. In the melamine paper case, the fork is between a duty-free code and one at 6.5% - on industrial import volumes, that difference, plus recalculated VAT and possible post-clearance recovery, is what ends up in court. The decking board fork separates chapters with different duty rates and different non-fiscal measures. In both underlying disputes, one side classified the goods by what the description said - paper, wood - and the outcome turned on the material that gives the product its essential character.

A note on the BTI evidence: a Binding Tariff Information decision binds only its holder and the customs authorities, so rulings like DEBTI1450/25-1 are comparison material, not protection for other traders. For goods that sit on a fork like these two, the professional route is to apply for your own BTI - and the evidence assembled in a session like this, from the governing regulation or judgment down to the closest issued rulings, is the substance such an application needs. It also shows the other side of the coin: when a new regulation or judgment contradicts an existing BTI, that BTI faces revocation, with only a limited period of extended use - another reason to know the current evidence before customs points it out.

For a customs broker,Classify AI turns that into a working method:

1. it identifies the competing chapters behind the commercial description;
2. it finds the rule that separates them - here, the essential-character test of GRI 3(b);
3. in Quick mode, it assembles the classification regulations, BTI decisions and case law on both sides for the user to weigh; in Finder mode, it classifies automatically and asks only when a decisive fact is missing;
4. it states the premise or assumption the result rests on and the alternative code if a fact turns out differently.

The decision, and the responsibility for it, stay with the person - not the machine. The broker chooses the code on the declaration and answers for it before the customs authority; Classify AI supplies the evidence and shows which fact the decision turns on. That fact still has to be verified on the actual goods: a flexible paper that keeps its paper character or a decking board with a PVC binder each carries a different code. What changes is the starting position - the broker no longer discovers which fact matters by losing an argument with customs. The evidence is on the screen from the start; the decision maker is the person reading it.