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Akuma
Akuma (Scyphocephalium mannii)

Family: Myristicaceae

Common names: Akuma, Eteng oswe, Ilombe, Ossoka, Ossoko, Soghe, Sogho, Sorra, Tshidungadunga, Tshifula

Distributed in: Cameroon, Gabon, Nigeria (Africa)

Common uses: Boat building (general), Cabinetmaking, Flooring, Furniture, Joinery, Light construction, Plywood corestock, Plywood, Toys, Turnery

Tree size: Trunk diameter is 100-150 cm

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodWhite to yellow, Yellow.The grain isWavy, the textureMedium to coarseand the lusterLustrous

Natural durability: Susceptible to attack from termites (Isoptera), Susceptible to insect attack

Kiln Schedules: Drying (speed) is fast

Kiln Drying Rate: Naturally dries quickly

Ease of Drying: Rapidly

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Blunting Effect: Little

Cutting Resistance: Cutting Resistance with green wood is easy

Gluing: Fairly Easy to Very Easy

Nailing: Easy to nail, Fairly Easy to Very Easy

Planing: Planes well, to a good finish

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Easy to machine


Polishing: Satisfactory; Staining: Fair to Good;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 560 kg/m3
Bending Strength 570 892 kg/cm2
Crushing Strength 233 391 kg/cm2
Hardness 510 kg
Impact Strength cm
Shearing Strength 90 kg/cm2
Stiffness 83 97 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 3 %
Weight 544 432 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 8110 12699 psi
Density 35 lbs/ft3
Hardness 1125 lbs
Maximum Crushing Strength 3324 5570 psi
Shearing Strength 1282 psi
Stiffness 1188 1383 1000 psi
Weight 34 27 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 5 %

Shrinkage, Radial = small
Shrinkage, Tangential = small
Bending strength (MOR) = medium
Max. crushing strength = medium
Density (dry weight) = 31-37 lbs/cu. ft.
Shrinkage, Tangential = very small
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = low
Bending strength (MOR) = low
Shrinkage, Radial = moderate
Max. crushing strength = low
Hardness (side grain) = soft
Hardness (side grain) = medium
Density (dry weight) = 38-45 lbs/cu. ft.
Shrinkage, Tangential = moderate
Hardness (side grain) = very soft

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Erfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry DepartmentFrance - C.T.F.T./C.T.B.,1982,Guide pour le Choix des Essences Deroulables-pour la fabrication du,contreplaque,C.T.F.T./C.T.B. FranceFranco, E.J. Sampaio,1965,Sur l'Aptitude de quelques Bois Africains a l'Emploi dans les Travaux,Maritimes et la Construction Navale. (The suitability of some African,timbers for use in maritime structures and ship building.,Min. Das Obras Publicas, Lab.Nac. de Engenharia Civil Lisbon,,Memoria.,No.243 pp19Garratt, G.A.,1933,Systematic anatomy of the woods of the Myristicacaeae,Tropical Woods,5(35,pp6-48Hughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataLebacq, L., Dechamps, R.,1967,Contribution a un Inventaire de Forets du Nord-kasai,Musee Royal de L'Afrique Centrale Belgium Annals Series 8 No.5Meniaud, J., Bretonnet, F.,1926,Les Bois Coloniaux d'Afrique dans l'Industrie,Publ. de l'Agence Gen. des ColoniesSallenave, P.,1955,Proprietes Phyiques et Mecaniques des Bois Tropicaux de l'Union Francaise,C.T.F.TSallenave, P.,1964,Proprietes Physiques et Mecaniques des Bois Tropicaux (Premier Supplement,C.T.F.T. Publ.,no.23Sallenave, P.,1971,Proprietes Physiques et Mecaniques des Bois Tropicaux (Deuxieme,Supplement,C.T.F.T.Steiger, A.,1973,Surveys of information on wood species 9,Holztechnologie,14(3, p184Yvon, J.,1973,Le Sorro (Scyphocephaliun mannii,Bois et Forets des Tropiques,No.152,pp51-4
*Come interpretare i dati (manleva su eventuali imprecisioni)