Woods To Know: Obeche

Woods To Know: Obeche

Obeche (Triplochiton scheroxylon)

by Peter MacSween

Obeche is an African hardwood that is heavily used within its natural range. It is native to Central West Africa, primarily the countries of Nigeria, Ghana and the Ivory Coast. A tall tree reaching over 150 feet in height with impressive 5-foot diameters, it produces large amounts of clear knot free lumber and veneer.  
 
While impressive in size, Obeche has a featureless and muted appearance with little of the ‘eye candy’ figuring that attracts woodworkers. Overall, its colour is a creamy white to a straw yellow. There is very little difference in colour between the sap and hardwood. This helps produce the large yields of lumber and veneer as there is no dark coloured sapwood to remove. The white colour also makes it a good choice for pulp production and the manufacture of particle and fiberboard. 

WTK_obeche

The grain has a medium to coarse texture and is usually interlocked. This interlocked grain will give it a striped appearance on quartered material. It is lightweight with low strength and stiffness. However, it does have a respectful strength to weight ratio. It is a poor candidate for steam bending. 
 
Obeche is not durable, prone to attack by insects and fungi. This wood must be stickered immediately after cutting to prevent blue staining on the lumber. Once dry it is very stable. Large logs may show brittle heart after drying, but Obeche usually dries with very little degrade. 
 
The wood works extremely well by hand or machine. Sharp tooling may help prevent ‘crumbling’ when sawing or machining.  here is very little wear on tooling when processing Obeche. It holds nails and screws well. There are no problems with gluing. This wood stains well and staining is an important technique to add visual interest to projects using Obeche. It polishes to a high degree aided by its natural lustrous appearance. Obeche can use a light filling to help make an outstanding finish. 
 
Within its range, Obeche is used for all sorts of interior projects. Railings, small boxes, mouldings, carving and cabinet frames are typical uses. North American woodworkers are most likely to see it as a plywood or veneer. Obeche is the premier wood for sauna interiors especially for surfaces that contact the skin.  This is due to its lack of splinters and low resin content. Obeche is also resistant to heat and shows poor heat attention, which further offers protection to delicate skin. 

WTK_obeche-endgrain
End-grain: Obeche
 
Obeche has found a home in the craft and hobby world when it is in model aircraft and miniature furniture. Korina is another common name for Obeche, and it was the wood used to make the original Gibson Flying V electric guitar. It is still used for solid body guitar construction due to its light weight and the availability of one piece bodies.
 
Obeche is now a common item in the inventory of specialty lumber dealers. It is also one of the least expensive imported species. It can be adapted to a lot of woodworking projects if you are prepared to work with its characteristics. For the furniture maker, secondary woods and mouldings are an ideal application. Given that there are a few environmental concerns, Obeche is a good choice for those interested in exploring tropical woods. Just remember that can of stain!
 
 
Average Dried Weight24 lbs/ft³A measure of its weight at 12% moisture and an ambient temperature of 70°F.
Specific Gravity.38A measure of the ratio of its density compared to water (at 12% MC)
ShrinkageRadial: 3.1
Tangential: 5.3
Volumetric: 8.7
Radial (the amount of crosswise shrinkage);
Tangential (the amount of lengthwise shrinkage);
Volumetric (the total amount of shrinkage.)
T/R Ratio1:7A measure of the uniformity of tangential to radial shrinkage.
Janka Hardness430 lbfA measure of resistance to denting and abrasion.
Crushing Strength4,250 lbf/in²A measure of compression strength parallel to the grain.
Colour
Heartwood tends to be a pale yellow, with the sapwood not clearly differentiated from the heartwood. Colors darken slightly with age.
GrainInterlocked.
TextureMedium to coarse with good natural luster.
Workability
Generally easy to work, though the interlocked grain can cause some rough surfaces in some machining operations. Carves, stains, glues, and finishes well.
Uses
Veneer, plywood, carvings, furniture, and interior millwork.
Price$5.60 4/4

 
  
Photos and Specifications Courtesy of: The Wood Database