Other Common Names: Elanzok, Elang (Cameroon), Kabulungu (Zaire).
Distribution: Widely distributed throughout the dense equatorial forests.
The Tree: Reaches a height of 120 ft and more; boles straight, cylindrical, and clear to long lengths; trunk diameters 4 to 6 ft; sometimes buttressed.
General Characteristics: Heartwood red to reddish brown with darker streaks; sapwood grayish, not always sharply demarcated from the heartwood. Texture is fine and even grain usually straight, sometimes interlocked; somewhat lustrous. Dust is very irritating to mucous membranes.
Weight: Basic specific gravity (ovendry weight/green volume) 0.78; air-dry density 60 pcf.
Mechanical Properties: (2-cm standard)
Moisture content Bending strength Modulus of elasticity Maximum crushing strength
(%) (Psi) (1,000 psi) (Psi)
12% (44) 21,800 NA 12,700
12% (44) 23,000 2,150 11,900
Amsler toughness 282 to 398 in.-lb at 12% moisture content (2-cm specimen).
Drying and Shrinkage: Seasons slowly and should be quartersawn to minimize degrade. No information available on kiln schedules. Shrinkage green to ovendry: radial 5.8%; tangential 7.4%; volumetric 14.8%. Reported to have a large movement in service.
Working Properties: Saws and machines fairly easily but with dulling of tools due to silica content; dresses to a smooth finish; difficult to glue; good ventilation is required to remove irritating dust.
Durability: Heartwood is rated as very durable though there may be slight termite attack. Resistant to dilute acids. Good weathering characteristics.
Preservation: Highly impermeable.
Uses: Heavy construction, flooring, furniture and cabinetmaking, acid vats, turnery, joinery.
Additional Reading: (3), (14), (44)
3. Bolza, E., and W. G. Keating. 1972. African timbers-the properties, uses, and characteristics of 700 species. CSIRO. Div. of Build. Res., Melbourne, Australia.
14. France: Bois For. Trop. 1954. Mukulungu (Autranellaa congolensis). Bois For. Trop. 36:25-28.
44.Sallenave, P. 1955. Proprietes et mecaniques des bois tropicaux de l'union Francaise. Pub. Centre Tech. For. Trop. No. 8.
From: Chudnoff, Martin. 1984. Tropical Timbers of the World. USDA Forest Service. Ag. Handbook No. 607.