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Fornitori

Ditta 5
Indirizzo: via dei platani 4 liguria
Tel.: +39 456 5664 54

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Ditta 4
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Ditta 3
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Ditta 2
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Ditta 1
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Tel.: +39 456 5664 54

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Ditta 0
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African walnut
African walnut (Coula edulis)

Family: Olacaceae

Common names: African walnut, Akion, Almond wood, Atsan, Attia, Bodwe, Bogue, Coula, Ebo, Ewome, Ewoumeu, Gabon nut, Kumunu-kumunu, Nkula, Okolla, Sra, Srah

Distributed in: Cameroon, Congo, Gabon, Ivory Coast, Liberia, Sierra Leone (Africa)

Common uses: Agricultural implements, Boat building (general), Carvings, Charcoal, Flooring, Furniture, Heavy construction, Joinery, Light construction, Millwork, Mine timbers, Musical instruments, Plywood, Poles, Posts, Railroad ties, Sporting Goods, Tool handles, Turnery, Vehicle parts

Tree size: Trunk diameter is 200-250 cm

Colors: the heart isRed, Reddish brownand the sapwoodWell defined, White to yellow.The grain isWeak figure, the textureMediumand the lusterDull

Natural durability: Very durable, Very durable

Kiln Schedules: Drying (speed) is fast

Drying Defects: Splitting

Ease of Drying: Slowly

Tree Identification: Bole/stem form is not buttressed

Comments: General finishing qualities are rated as good

Cutting Resistance: Easy to saw

Gluing: Fairly Easy to Very Easy

Nailing: Difficult to nail, Pre-Boring Recommended

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Easy to machine

Screwing: Pre-boring recommended ; Turning: Fairly Easy to Very Easy

Painting: Good; Polishing: Very Good to Excellent; Varnishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 961 kg/m3
Bending Strength 1161 1698 kg/cm2
Crushing Strength 548 772 kg/cm2
Hardness 1047 kg
Impact Strength cm
Shearing Strength 177 kg/cm2
Stiffness 143 166 1000 kg/cm2
Tangential Shrinkage 8 %
Radial Shrinkage 4 %
Weight 945 769 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Bending Strength 16521 24154 psi
Density 60 lbs/ft3
Hardness 2310 lbs
Maximum Crushing Strength 7795 10986 psi
Shearing Strength 2525 psi
Stiffness 2048 2369 1000 psi
Weight 59 48 lbs/ft3
Radial Shrinkage 4 %
Tangential Shrinkage 8 %
Volumetric Shrinkage 12 %

Shrinkage, Tangential = fairly large
Max. crushing strength = high
Bending strength (MOR) = very high
Bending strength (MOR) = high
Shrinkage, Volumetric = fairly large
Shrinkage, Radial = moderate
Shrinkage, Radial = fairly large
Shrinkage, Volumetric = moderate
Shrinkage, Tangential = large
Hardness (side grain) = hard
Shrinkage, Tangential = very small
Shrinkage, Radial = very small
Shearing strength (parallel to grain) = medium
Shearing strength (parallel to grain) = high
Modulus of Elasticity (stiffness) = medium
Modulus of Elasticity (stiffness) = high
Max. crushing strength = very high
Shrinkage, Tangential = small
Shrinkage, Radial = small
Modulus of Elasticity (stiffness) = very high
Hardness (side grain) = very hard
Hardness (side grain) = medium
Density (dry weight) = 61-67 lbs/cu. ft
Density (dry weight) = 53-60 lbs/cu. ft
Bending strength (MOR) = medium

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,pp1-153Erfurth, 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, CanadaFougerousse, M., Deschamps, P.,1968,Essais de Resistance de quelques Bois Tropicaux aux Xylophages Marins dans,la,Port de la Pallice,C.T.F.T. Note Technique,No.7Hughes, J.F.,1971,The Principal Timber Trees of Cameroon,Unpublished dataIrvine, F.R.,1961,Woody Plants of Ghana,O.U.P. LondonKryn, J.M., Forbes, E.W.,1959,The Woods of Liberia,U.S.A. Department of Agriculture,Forest Products Laboratory, Madison,,Report No. 2159Kunkel, G.,1965,The Trees of Liberia,German Forestry Mission to Liberia Report,No.3Sallenave, 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)