Okoume Wood (Aucoumea klaineana): Properties, Density & Uses

What okoume is

Okoume is a large tropical hardwood native to the equatorial forests of West-Central Africa. Despite being classed as a hardwood, it is unusually light and soft — closer in weight to many softwoods than to the dense tropical timbers it grows beside.2 That combination of low weight, a pale and even surface, and a trunk that peels cleanly into wide continuous veneer is exactly what a plywood mill wants, which is why okoume became the backbone of the African plywood trade.1

In Gabon it is the dominant commercial species, historically accounting for the majority of the country's timber output.2 Most of it never reaches a buyer as a solid board — it leaves as veneer, plywood, or logs destined for peeling.

Where it grows

The natural range is narrow: mainly Gabon, with stands extending into Equatorial Guinea (Río Muni), the Republic of the Congo and southern Cameroon.5 The tree tends to grow in groups whose roots intertwine, and it reaches 30–40 metres in height with a clean cylindrical bole one to two-and-a-half metres across above the buttresses2 — a form that yields long, defect-free veneer.

Appearance and grain

The heartwood runs from a pale salmon-pink to a light pinkish-brown, deepening a little with age and light exposure; the sapwood is paler and not sharply separated.1 Grain is straight to slightly wavy or interlocked, giving a soft ribbon figure on quartered veneer, and the texture is medium with a gentle natural lustre. On a finished panel it reads as a calm, uniform face that takes stain, paint and print evenly — useful both for decorative work and for cases that will be branded or stencilled.

Weight, density and strength

Okoume's defining property is its low density — about 430 kg/m³ at 12% moisture (roughly 27 lb/ft³), which several independent sources agree on.13 By way of comparison, that is around half the weight of a dense structural hardwood such as gurjan (keruing). The strength numbers follow from the low density: a modulus of rupture near 75 MPa and stiffness (elastic modulus) around 8.5 GPa place it among the weaker commercial hardwoods.1

Hardness is where sources diverge, and it is worth being honest about it: dry-tested Janka figures cluster near 400 lbf (about 1,780 N), while older green-tested USDA data report values as low as ~240 lbf.13 Either way okoume is soft — it dents and scratches easily — so it earns its place through lightness and veneer yield, not through surface toughness.

Working, gluing and finishing

Okoume peels and slices into veneer beautifully, which is its whole commercial reason for being. In solid form it is a mixed bag: the wood contains silica, which blunts knives and saw teeth, and its softness invites tearout and fuzzy grain when planing or sanding.13 Against that, it glues and finishes well and holds a painted or lacquered coat cleanly — the properties that matter most when the wood is used as a bonded veneer skin rather than a machined part.

Durability and treatment

Left untreated, okoume is non-durable: it has poor resistance to decay fungi and little natural resistance to insect attack, and it is not suited to ground contact or sustained wetting.13 This is why okoume plywood intended for humid or marine service is built with a boil-proof (BWP/BWR-class) adhesive and, where specified, preservative treatment — the glue-line and treatment, not the timber itself, carry the moisture performance.

Sustainability and legality

Okoume is listed as Vulnerable on the IUCN Red List, reflecting decades of heavy extraction and pressure on the gene pool in parts of its range.4 It is not CITES-listed, but it is monitored under the European Union's import framework, and Gabon has moved to keep more processing (and value) inside the country. For a buyer this means one thing in practice: ask where the veneer came from and buy from mills that can show legal, well-managed supply.

How Cochin Wood uses okoume

For us, okoume is a face and core veneer, not a solid board. Its lightness is the commercial argument: a packing case or export crate skinned in okoume plywood carries less dead weight, which lowers volumetric and air-freight cost, while the smooth pale face brands and stencils cleanly. The same low weight and clean surface make it a favourite for lightweight marine and panelling plywood. Where a panel must instead carry heavy structural load, we move to a denser face such as gurjan — see okoume vs gurjan for that choice, or okoume packing plywood for grades and sizes.