240 pieces of teak outdoor furniture arrived. The end grain on every leg was the same wrong species.

The situation

A hotel group ordered 240 pieces of outdoor furniture for a terrace project — 40 tables and 200 chairs — in teak. The purchase order named the species in one line: *Tectona grandis, natural teak oil finish*. The order was $124,000. The teak specification accounts for roughly $34,000 of that.

Teak carries the highest material premium in outdoor furniture, and it earns it. It is dense, it contains natural oils that resist weather and insects, and it does not move much on an uncovered terrace. Eucalyptus is durable too — it is the species used for the overwhelming majority of outdoor furniture in the world — but it is a different product at a different price, and it needs coating maintenance that teak does not.

The goods left the factory in containers. They arrived looking correct. The colour was right, the grain was clean, the finish was even and glossy, and every piece matched the approved sample that had been signed off in the showroom six weeks earlier.

They were not teak. **The oil finish had been chosen, in effect, as a covering.** Oiled eucalyptus is warm reddish-brown and takes teak oil readily. Under a clear coat, at a distance, in a photograph, the two are extremely difficult to separate. That is not an accident. It is what makes teak the easiest high-value substitution in this category to get wrong in either direction.

Why species is worth more attention here than anywhere else

In most furniture categories, wood species is an aesthetic and pricing decision. In outdoor furniture it is a **performance** decision, and the performance is what the end customer is being sold.

**Oil content is the mechanism.** Teak's resistance to decay and insect attack comes from the extractives in its cell structure — the same oils that give it its colour and its smell. Eucalyptus has no comparable extractive content at working density. Its outdoor durability depends on being sealed and recoated on a schedule; left unsealed, it weathers grey and begins to lose integrity considerably sooner.

So the substitution does not just change what the buyer paid. It changes what has to happen to that furniture after installation, and the buyer who signed a specification reading *Tectona grandis* has not agreed to a maintenance regime they were never told about. **This is why outdoor furniture inspection china work spends more time on species than any other category**, and why the check is written into the order rather than left to the loading dock.

It is also why the species question is never settled by asking the factory. Both eucalyptus and teak arrive labelled and documented. Neither party gains anything from an argument about paperwork, because the paperwork is exactly what a substitution is careful to keep intact.

What the end grain comparison actually showed

Teak is ring-porous. Its end grain shows visible dark streaks of latewood at the growth rings, a dense structure, and a distinctly oily surface that sheds water. Eucalyptus is diffuse-porous: pores are distributed evenly across the whole face, growth rings show as faint tonal bands rather than sharp streaks, and the surface reads matte and absorbent.

The comparison is quick. It needs an unpainted, unsanded-beyond-repair cut end — in a chair, the end of a rear leg or the underside of the seat rail at a joint. It needs daylight, and it needs the approved sample in the hand, not a photograph of it.

Why this stays indicative and not conclusive

Every observation above is a comparative one. *The end grain is more open. The surface is absorbent. The piece is lighter.* Each is consistent with eucalyptus. None of them identifies eucalyptus, and a report that says so has overstepped.

The reasons are structural, not cautious. Species identification by eye needs a validated reference and a known set of confounders, and outdoor furniture is a poor environment for it: staining, coating systems, ebonising, weathering, oil content and moisture all alter the visual evidence. A treated eucalyptus piece and an untreated teak piece can be made to look alike deliberately, and the factory that did the substitution here had no reason to make it easier.

What the on-site evidence *does* support is a firm statement: **the end grain structure, surface behaviour and unit weight of the shipped goods are inconsistent with the approved teak sample, and consistent with a different, lighter species.** That is a finding. It is enough to stop the container and enough to put the question to the factory. It is not enough to name the species in a report, and a report that names it hands the factory a technical argument for free.

• **Indicative** — several independent observations point away from the specified species, and are consistent with alternatives.
• **Conclusive** — the species is identified to a named taxon by a method with a stated accuracy.
• **Most factory responses in this position accept the indicative finding**, because they already know the answer. That is the practical point: the objective of the on-site stage is to establish a defensible non-conformance, not to win an argument about wood.

What triggers core sampling

Two non-destructive alternatives are worth knowing about. **Near-infrared spectroscopy** with a validated species library identifies wood quickly and leaves no mark, and it is now routine in larger laboratories — but it needs a library that includes both candidate species at the density and moisture of the product, and an unknown library turns a measurement into another indicative reading. **Portable XRF** does not apply to organic identification. Where the container is already sealed, cores remain the reliable route.

• **The on-site comparison contradicts the paperwork.** This batch is the plain case: the end grain did not match the approved sample, and the factory's own incoming purchase records listed a different species. The two together are enough to justify the cores — and they are recorded together, because each alone would be arguable.
• **The material differential is a material share of the unit price.** Here the species premium was $34,000 on a $124,000 order. As a rule of thumb, if the material difference between the specified and likely alternative species is more than a few percent of the FOB value, a $150 laboratory determination is cheap insurance. If the premium is $200 on a $900 order, it may not be.
• **The units disagree with each other.** If some pieces match the sample and others do not, the product is mixed, and no amount of on-site comparison will tell the buyer what proportion is what. That is a sampling-design problem and only the cores answer it.
• **The species will be named in the destination market.** A teak-named product line, a retail listing, a spec sheet or an insurance schedule that all say *teak* turns a material question into a consumer-law question in the destination country. At that point the buyer needs a laboratory result, not an inspector's opinion.
• **Someone intends to rely on natural decay resistance.** If the design relies on teak's extractives rather than on a coating schedule, the specification has to establish that those extractives are present.

How it was written in the report

The report did not say the factory had committed fraud, and it did not describe the substitution as deliberate. It said the goods were eucalyptus and were invoiced and specified as teak, that this was established across six independently sampled pieces, and that the factory's incoming purchase documentation named eucalyptus. **Those are observations and a documented difference. The motive was never established, and the report did not claim it was.**

The practical consequence of that wording was speed. The factory did not contest the finding, because there was nothing left to contest once six laboratory results were attached, and the matter was resolved before the demurrage clock mattered rather than during it.

What to put in the specification

One line is worth adding to any teak order regardless of the rest: **name the species on the commercial invoice as well as in the purchase order.** The invoice is the document the destination market sees, and it is the one a substituted batch is careful to leave alone. Putting the botanical name on both makes the two documents agree or makes the difference visible on paper.

• **The botanical name, not the trade name.** *Tectona grandis* is checkable in a laboratory. *Teak* is a word that a market has agreed to mean several things. State also whether plantation or wild, whether heartwood only or a heartwood/sapwood allowance is permitted — plantation teak with a sapwood allowance is a legitimate product and a common one, and it is not what a buyer comparing against a solid-wood showroom sample has in mind.
• **Single species throughout, and where it may vary.** *No substitution of any species.* Then say which parts must be teak — table top, arms, frame — and which may be a different, named material. A specification that requires teak in a concealed frame nobody will ever see adds cost and inspection time for nothing; a specification that is silent lets the whole product be judged on its visible parts.
• **The finish, because the finish is what carried the substitution.** State whether the material is supplied oiled, unfinished, or finished, and whether pigment or stain is permitted. If a colour is specified, require it to be achieved by the wood rather than by a coating — otherwise colour matching becomes a way to move a species and no one will ever notice.
• **What evidence counts.** Say whether a supplier certificate or an FC documentation is acceptable, whether core sampling at inspection is authorised, and who bears the laboratory cost if the cores fail to confirm the specified species. Left unstated, the certificate wins by default, because it is the document that already exists.
• **A density range as a field proxy.** Dry teak sits around 650–750 kg/m³; the common eucalyptus species used in outdoor furniture sit noticeably lower. A single figure for the species — *minimum dry density 620 kg/m³* — costs nothing to write, needs no laboratory, and turns the weight check from an observation into a comparable number.