Freshly cut or unexposed to light, the heartwood of Iroko is a distinct yellow colour, quickly turning golden brown as it absorbs light.

The sapwood is narrow, being about 50mm to 75mm wide, and clearly defined.

The grain is usually interlocked and the texture is rather coarse but even, and the wood weighs on average 660 kg/m³ when dried.

Large, hard deposits of calcium carbonate called ‘stone’ deposits are sometimes present in cavities, probably as a result of injury to the tree. They are often enclosed by the wood and not visible until the time of sawing, though the wood around them may be darker in colour, thus giving an indication of their presence.

Iroko has excellent strength properties, comparing well with teak, though weaker in bending and in compression along the grain.

Working Qualities

Medium to difficult – Iroko works fairly well with most tools, though with some dulling effect on their cutting edges, especially when calcareous deposits are prevalent. On quarter-sawn stock, there is a tendency for grain to pick up due to interlocked grain, and a reduction of cutting angle to 15° is usually necessary to obtain a smooth surface. An excellent finish can be obtained if the grain is filled. It takes nails and screws well, and can be glued satisfactorily.