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AkabaAkaba
Akaba (Tetraberlinia bifoliolata)

Family: Caesalpiniaceae

Common names: Akaba, Andoung, Apado, Berlinia, Ekaba, Ekap ribi, Eko andoung, Ekop, Ekop ribi, Gola, Hoh, Mudungu, Sikon, Tetraberlinia, Zebiche

Distributed in: Angola, Benin, Cameroon, Congo, Equatorial Guinea, Gabon, Ghana, Ivory Coast, Liberia, Nigeria, Togo, Zaire (Africa)

Common uses: Bent Parts, Boxes and crates, Building materials, Cabinetmaking, Casks, Chairs, Chests, Desks, Dining-room furniture, Drawer sides, Excelsior, Fine furniture, Flooring, Furniture , Furniture components, Furniture squares or stock, Hatracks, Interior construction, Interior trim, Joinery, Kitchen cabinets, Light construction, Living-room suites, Millwork, Moldings, Office furniture, Packing cases, Plywood, Radio - stereo - TV cabinets, Rustic furniture, Stools, Turnery, Utility furniture, Veneer: decorative, Wardrobes

Product sources: The ITTO reports that timber from this species is produced only occasionally and exported in negligible quantities.

Environment profile: Status unknown in some areas due to inadequate information

Tree size: Trunk diameter is 150-200 cm

Colors: the heart isWhite, Yellowand the sapwoodWhite, Yellow.The grain isStraight, the textureUniformand the lusterLustrous

Natural durability: Susceptible to insect attack, Very durable

Odor: No specific smell or taste

LightInduced Color Change: Darker

Kiln Schedules: Drying (speed) is fast

Drying Defects: Moderate distortion may occur during drying , Surface checks, end checks and fungal staining may also occur

Ease of Drying: Reconditioning Treatement

Tree Identification: Bole/stem form is buttressed

Comments: DepositsGeneral finishing qualities are rated as good Large logs often contain brittleheart.Natural Growth DefectsReaction with Metals - Contact with iron and iron compounds under moist conditions may promote staining in the wood.The timber is reported to often contain hard black kino.

Blunting Effect: Slight dulling effect on cutting tools

Boring: Fairly easy to very easy

Carving: Fairly Easy to Very Easy

Cutting Resistance: Low resistance to sawing

Gluing: Very Good to Excellent Results

Mortising: Very Good to Excellent

Moulding: Very Good to Excellent

Movement in Service: Very Good to Excellent

Nailing: Holds nails well, Poor to Very Poor

Planing: Very Good to Excellent

Resistance to Impregnation: Sapwood is permeable

Response to hand tools: Responds well to hand tools

Routing recessing: Very Good to Excellent Results

Sanding: Good sanding properties

Veneering qualities: Good gluing qualities

Steam bending: Poor to Very Poor Results

Screwing: Poor to Very Poor Results, Screwing yields good results; Turning: Very Good to Excellent Results

Painting: Very Good to Excellent; Polishing: Polishes to a smooth finish ; Staining: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 608 kg/m3
Bending Strength 656 1014 kg/cm2
Crushing Strength 319 521 kg/cm2
Hardness 449 kg
Impact Strength cm
Shearing Strength 105 kg/cm2
Stiffness 94 109 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 4 %
Weight 641 592 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 9341 14432 psi
Density 38 lbs/ft3
Hardness 992 lbs
Maximum Crushing Strength 4549 7418 psi
Shearing Strength 1507 psi
Stiffness 1339 1563 1000 psi
Weight 40 37 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 8 %

Shrinkage, Radial = moderate
Shrinkage, Tangential = moderate
Max. crushing strength = medium
Bending strength (MOR) = medium
Bending strength (MOR) = high
Shrinkage, Radial = small
Modulus of Elasticity (stiffness) = very low
Max. crushing strength = high
Hardness (side grain) = soft
Shrinkage, Tangential = fairly large
Shrinkage, Radial = fairly large
Shearing strength (parallel to grain) = low
Modulus of Elasticity (stiffness) = low
Shrinkage, Tangential = large
Shearing strength (parallel to grain) = very low
Density (dry weight) = 38-45 lbs/cu. ft.
Shrinkage, Tangential = small
Shrinkage, Radial = large
Modulus of Elasticity (stiffness) = medium
Modulus of Elasticity (stiffness) = high
Heavy
Hardness (side grain) = very soft
Hardness (side grain) = medium
Density (dry weight) = 46-52 lbs/cu. ft.
Density (dry weight) = 31-37 lbs/cu. ft.
Dense
Compression strength (parallel to grain) = high
Bending strength (MOR) = low

Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchErfurth, 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. FranceFrance - C.T.F.T.,1977,Promotion of African Timbers - New Species,CTFT,35 LeafletsHughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataITTO.1986.Tropical Timber Atlas, Volume 1 - Africa.International Tropical Timber Organization (ITTO) and Centre Technique Forestier Tropical (CTFT, 45bis, Avenue de la Belle Gabrielle, Nogent-sur-Marne Cedex, France.Letouzey, R., Mouranche, R.,1952,Ekop du Cammeroun,C.T.F.T,France Publ.,No.4Lewis, F.,1934,The Vegetable Products of Ceylon,Assoc. Newspapers of Ceylon Ltd.Normand, D.,1952,Ekop ou Andoung - Une des Essences Interessantes a retenir,Bois et Forets des Tropiques,No.26,pp381-87Sallenave, 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.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)