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Bobenkusu
Bobenkusu (Anopyxis klaineana)

Family: Rhizophoraceae

Common names: Abari, Abra, Bobenkusu, Bodioa, Evam, Goe, Hainde, Kodoti, Kokote, Kokoti, Kokoti-bakaa, Kpomuisi, Naudougou, Noudougou, Otutu, Wei-kpo, Weng, White oak

Distributed in: Benin, Cameroon, Central African Republic, Congo, Equatorial Guinea, Ethiopia, Gabon, Ghana, Ivory Coast, Liberia, Nigeria, Sierra Leone, Sudan, Togo (Africa)

Distribution overview: Tropical Africa (Sierra Leone - Zaire), as well as in Sudan and Ethiopia.

Common uses: Agricultural implements, Boxes and crates, Building construction, Building materials, Cabin construction, Casks, Construction, Crossties, Decorative plywood, Domestic flooring, Excelsior, Factory construction, Factory flooring, Flooring, Flooring: commercial heavy traffic, Flooring: industrial heavy traffic, Fuelwood, Furniture, Handles: general, Heavy construction, Interior construction, Interior trim, Joinery, Light construction, Millwork, Mine timbers, Moldings, Packing cases, Parquet flooring, Pile-driver cushions, Piling, Plywood, Railroad ties, Sporting Goods, Structural plywood, Sub-flooring, Toys, Trimming, Turnery, Utility plywood, Veneer, Wainscotting

Environment profile: Vulnerable in parts of its natural habitat

Tree size: Trunk diameter is 150-200 cm

Colors: the heart isYellow to golden-yellow to orange, Yellowish tanand the sapwoodSame as heartwood, Yellow.The grain isWavy, the textureMedium to coarseand the lusterSlightly lustrous

Natural durability: Susceptible to blue stain attack , Susceptible to insect attack

Odor: No specific smell or taste

Drying Defects: Severe twisting/warping, Slight surface checking

Ease of Drying: Variable shrinkage

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good Tough Very hard

Blunting Effect: Little

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Saws readily although it is hard and tough

Gluing: Good gluing properties

Mortising: Fairly Easy to Very Easy

Moulding: Fairly Easy to Very Easy

Movement in Service: Fairly Easy to Very Easy

Nailing: Pre-Boring Recommended, Requires pre-boring

Planing: Works rather easily dulling

Resistance to Abrasion: Highly resistant to wear

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Easy to machine

Routing recessing: Fairly Easy to Very Easy

Veneering qualities: Veneers easily, Veneers moderately easy

Screwing: Pre-Boring is recommended in screwing , Pre-boring recommended; Turning: Fairly Easy to Very Easy

Polishing: Very Good to Excellent; Staining: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 913 kg/m3
Bending Strength 1076 1613 kg/cm2
Crushing Strength 504 761 kg/cm2
Hardness 1164 kg
Impact Strength cm
Shearing Strength 202 kg/cm2
Stiffness 157 181 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 5 %
Weight 897 721 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 15304 22948 psi
Density 57 lbs/ft3
Hardness 2567 lbs
Maximum Crushing Strength 7170 10831 psi
Shearing Strength 2878 psi
Stiffness 2240 2580 1000 psi
Weight 56 45 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 9 %

Shrinkage, Tangential = large 0
Shrinkage, Radial = large 0
Max. crushing strength = high
Modulus of Elasticity (stiffness) = high
Bending strength (MOR) = very high
Bending strength (MOR) = high
Shearing strength (parallel to grain) = very high
Shrinkage, Radial = fairly large
Hardness (side grain) = hard
Density (dry weight) = 61-67 lbs/cu. ft
Shrinkage, Tangential = small
Shrinkage, Tangential = moderate
Shrinkage, Tangential = fairly large
Shrinkage, Radial = small
Shrinkage, Radial = moderate
Hardness (side grain) = very hard
Density (dry weight) = 53-60 lbs/cu. ft
Very high density
Shearing strength (parallel to grain) = high
Modulus of Elasticity (stiffness) = very high
Max. crushing strength = very high
Density (dry weight) = 46-52 lbs/cu. ft.
Compression strength (parallel to grain) = very high
Bending strength (MOR) = medium
It is far stronger, for example, than Hard maple, White oak, or Teak

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchCooper, G.P., Record, S.J.,1931,The Evergreen Forests of Liberia,Yale School Forestry Bulletin,31,pp1-153Dudek, S.,1981,Lesser Known Liberian Timber Species,German Agency for Technical Cooperation GermanyErfurth, T., Rusche, H.,1976,The Marketing of Tropical Wood A. Wood Species from African Moist Forests,F.A.O. Forestry DepartmentFortin, Y., Poliquin, J.,1976,Natural Durability and Preservation of 100 Tropical African Woods,International Development Research Centre, CanadaFouarge, J.,1970,Essais Physiques,Mecaniques et de Durabilite de Bois de la Republique,Democratique du Congo,I.N.E.A.C. Belgium Serie Technique,No.76France - C.T.F.T.,1961,Resultats des Observations et des essais effectues au CTFT sur Bodioa,C.T.F.T.,Information Technique,No.116Ghana - Timber Marketing Board,1969,Ghana Hardwoods,Timber Marketing BoardHughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataI.U.F.R.O.,1973,Veneer Species of the World,Assembled at F.P.L. Madison on behalf of I.U.F.R.O. Working Party on,Slicing and Veneer CuttingIrvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonKeay, R.W.J.1989. Trees of Nigeria.Revised Version of Nigerian Trees . Clarendon Press, Oxford.Kinloch, D., Miller, W.A.,1949,Gold Coast Timbers,Govt. Printer Gold CoastKryn, J.M., Forbes, E.W.,1959,The Woods of Liberia,U.S.A. Department of Agriculture,Forest Products Laboratory, Madison,,Report No. 2159Sallenave, 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.Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7
*Come interpretare i dati (manleva su eventuali imprecisioni)