USDA Forest Service
Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53705-2398
Wood Technical Fact Sheet
syn. Sarcocephalus diderrichii
Other Common Names: Kusia (Ghana), Badi (Ivory Coast), Bilinga (Gabon), Akondoc (Cameroon), N'Gulu-maza (Zaire), Kilingi (Uganda).
Distribution: Widely distributed from Sierra Leone to the Congo region and eastward to Uganda; often found in pure stands.
The Tree: Up to about 160 ft in height, with straight, cylindrical boles clear to 80 to 100 ft, trunk diameters 3 to 6 ft.
General Characteristics: Heartwood orange or golden yellow, darkening on exposure; sapwood whitish or pale yellow, clearly defined. Texture rather coarse; grain usually interlocked or irregular; lustrous; without characteristic odor or taste. An alkaloid in the wood may be toxic to woodworkers.
Weight: Basic specific gravity (ovendry weight/green volume) 0.63; air-dry density 47 pcf.
Mechanical Properties: (2-cm standard)
Moisture content Bending strength Modulus of elasticity Maximum crushing strength
(%) (Psi) (1,000 psi) (Psi)
Green (9) 13,700 1,720 7,480
12% 17,400 1,940 10,400
12% (46) 15,000 2,000 8,600
Janka side hardness 1,520 lb for green and 1,630 lb for dry material. Amsler toughness 220 in.-lb at 12% moisture content (2-cm specimen).
Drying and Shrinkage: Quartersawn stock dries rather rapidly with little checking or warp; flatsawn lumber may develop considerable degrade. Thin stickers and end-coating is suggested. Kiln schedule T6-D2 is suggested for 4/4 stock and T3-D1 for 8/4. Shrinkage green to ovendry: radial 4.5%; tangential 8.4%; volumetric 12.6%. Movement in service is rated as small.
Working Properties: Timber works moderately well with hand and machine tools, requires a slow feed in sawing, a 10-degree cutting angle is suggested for planing prevent tearing; good gluing; takes a satisfactory finish. Poor steam- bending characteristics.
Durability: Heartwood is rated as very durable but is moderately resistant to termites. Sapwood liable to powder-post beetle attack. Heartwood resistant to marine borers.
Preservation: Sapwood permeable; heartwood moderately resistant.
Uses: Dock and marine work, boatbuilding (except bent work), railway crossties, general construction, flooring, furniture and cabinet parts.
Additional Reading: (3), (9), (31), (46)