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Adjouaba
Adjouaba (Dacryodes buettneri)

Family: Burseraceae

Common names: Adjouaba, Assa-mingoug, Assia, Essassia, Igaganga, Massikou, Mouguengueri, Mouzighou, Musiku, N'sikou, Nkala, Osighou, Osogho, Ossabel, Ossamvegna, Ozigo, Safoukala, Safunkala, Samveien, Tchibudimbu

Distributed in: Cameroon, Congo, Equatorial Guinea, Gabon (Africa)

Distribution overview: Probably in West Africa and mainly in rain forests.

Common uses: Balusters, Bedroom suites, Boat building (general), Boxes and crates, Building construction, Building materials, Cabinetmaking, Chairs, Chests, Concealed parts (Furniture), Construction, Decorative plywood, Decorative veneer, Desks, Dining-room furniture, Domestic flooring, Dowell pins, Dowells, Drawer sides, Excelsior, Figured veneer, Fine furniture, Floor lamps, Flooring, Furniture , Furniture components, Furniture squares or stock, Furniture, Hatracks, Interior construction, Joinery (external): ground contact, Joinery, Kitchen cabinets, Light construction, Living-room suites, Millwork, Moldings, Office furniture, Parquet flooring, Plywood, Poles, Posts, Pulp/Paper products, Radio - stereo - TV cabinets, Railroad ties, Rustic furniture, Shipbuilding, Stairworks, Stools, Stringers, Tables, Vats, Vehicle parts, Veneer: decorative

Product sources: The ITTO reports that the species is a regular source of timber for exportation.

Environment profile: Secure within its range

Tree size: Trunk diameter is 150-200 cm

Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodWhite, Yellow.The grain isStraight, the textureMedium to coarseand the lusterOccaisonally lustrous

Natural durability: Susceptible to marine borer attack, Very durable

Odor: No specific smell or taste

Silica Content: Likely to have significant impact on machining

Kiln Schedules: Drying (speed) is fast

Kiln Drying Rate: Very slow

Drying Defects: Moderate surface checking, Splitting

Ease of Drying: Slowly

Tree Identification: Bole/stem form is straight

Comments: General finishing qualities are rated as good

Blunting Effect: Moderate

Boring: Fairly difficult to very difficult

Cutting Resistance: Fairly Difficult to Very Difficult to saw

Gluing: Fairly Easy to Very Easy

Mortising: Fairly Easy to Very Easy

Moulding: Very Good to Excellent

Movement in Service: Very Good to Excellent

Nailing: Fairly Difficult to Very Difficult, Holds nails well

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Routing recessing: Fairly Difficult to Very Difficult

Sanding: Fairly Easy to Very Easy

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Fair to Good Results

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

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 0,56
Density 657 kg/m3
Bending Strength 783 1331 kg/cm2
Crushing Strength 345 589 kg/cm2
Hardness 450 kg
Impact Strength cm
Shearing Strength 73 kg/cm2
Stiffness 107 143 1000 kg/cm2
Tangential Shrinkage 7 %
Radial Shrinkage 5 %
Weight 560 448 kg/m3
Maximum Load cm-kg/cm3
Toughness 311 cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 11139 18938 psi
Density 41 lbs/ft3
Hardness 993 lbs
Maximum Crushing Strength 4911 8383 psi
Shearing Strength 1052 psi
Stiffness 1536 2048 1000 psi
Toughness 270 inch-lbs
Specific Gravity 0.56
Weight 35 28 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 7 %
Volumetric Shrinkage 13 %

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

Banks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48Banks, C.H.,1954,The Mechanical Properties of Timbers with Particular Reference to those,grown in the Union of South Africa,Journal of the South African Forestry Association,No. 24 pp.44-65,[South,African Forestry Journal]Bois et Forets des Tropiques,1947,Ozigo - Pachylobus bultneri,Bois et Forets des Tropiques,No.3,pp43-6Bois et Forets des Tropiques,1955,Quels sont les problemes poses par le deroulage de l'Ozigo,Bois et Forets des Tropiques,No.44, pp56-7Bolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchChudnoff, 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 DepartmentFortin, Y., Poliquin, J.,1976,Natural Durability and Preservation of 100 Tropical African Woods,International Development Research Centre, CanadaFrance - 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.,1961,Resultats des Observations et des essais effectues au CTFT sur Ozigo,C.T.F.T.,Information Technique, No.77France - C.T.F.T.,1966,Bois Tropicaux,C.T.F.T. Publ.,12France - C.T.F.T.,1977,Promotion of African Timbers - New Species,CTFT,35 LeafletsGutierrez Oliva, A., Plaza Pulgar, F.,1967,Caracteristicas fisico-mecanicas de las maderas Espanolas. (Physical and,mechanical properties of Spanish timbers.,Min.Agric./Dir.Gen Montes/Instituto Forestral de Investigaciones,y,Experiencias, Madrid pp102Hughes, 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 CuttingITTO.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.Jay, B.A.,1968,Timbers of West Africa,TRADA, Red Booklet SeriesOrganisation for European Economic Co-operation,1951,African Tropical Timber (Nomenclature, Description,OEECSallenave, 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
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