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EKOUNE (Coelocaryon preussii)
Trade Name
Ekoune
Scientific Name
Coelocaryon preussii Warb.
Family
MYRISTICACEAE
Common Names
Ekun (Gabon); Ekoune (Gabon); Ekoune (Equatorial Guinea); Kikubi-Lomba (Congo); Lomba-kumbi (Zaire); Kikubi-lomb (Congo); Ekun (Equatorial Guinea); Ekoune
Scientific Name Synonyms
Coelocaryon multiflorum Warb.; Coelocaryon klainei Pierre; Coelocaryon cuneatum Warb.
Description Of The Tree
Botanical Description
The tree reaches a height of 32 m. The bole is usually clear, straight and cylindrical, unbuttressed and up to 16 to 20 m in length. The trunk diameter attains 30 to 100 cm.
Natural Habitat
Coelocaryon preussii is abundant in secondary forests, and also in lowland rain forests.
Natural Distribution
Equatorial Africa and in Nigeria and Gabon
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Tyloses thin walled. Occasionally tyloses common. Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforatio Occasionally axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 2 seriate. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with distinctly bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is pale orange, yellow to pale yellow brown, occasional dark purple veins, it is not clearly demarcated. The silver figure is fine.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
Straight; grain has no particular influence on drying, machining and finishing qualities.
Texture
Texture is usually fine to medium.
Luster
The wood surface is described as low in luster.
Natural Durability
Not durable; important risks of decay attacks at any processing step, from logs up to final products. It must receive preservative treatment. Sensible to termites attack. Heartwood is sensible to Lyctus attacks.
Natural durability index (1= Very high durability, 7=Vey low durability)
5
Internal Growth Stresses
No growth stresses are reported in this species.
Resistance To Impregnation
Easy to treat with a full penetration of the preservative products using vacuum-pressure method.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.49
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.53
Total shrinkage Tangential (Saturated to 0%MC) (%)
7.0
Total shrinkage Radial (Saturated to 0%MC) (%)
3.8
Drying Defects
Ease of Drying: Air drying is reported as good.
Recommended Dry Kiln Schedule
FR-5
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.8
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
749
Stiffness (MOE) 12%MC (kgf/cm²)
127045
Compression parallel to fiber 12%MC (kgf/cm²)
391
Compression perpendicular to fiber 12%MC (kgf/cm²)
45
Shear strength radial 12%MC (kgf/cm²)
63
Janka hardness (side) 12%MC (kgf)
339
Janka hardness (end grain) 12%MC (kgf)
442
Workability
Sawing
It is easy to saw.
Rotary Veneer Cutting
Suitable for peeling if treated.
Sliced Veneer
Suitable for peeling if treated.
Blunting Effect
Slight blunting effect; ordinary tools can be used for sawing and machining.
Machining
Machining of this species is reportedly easy.
Planing
Easy; no particular problems.
Moulding
Moderately easy; tools must be cautiously sharpened.
Boring
Moderately easy; tools must be cautiously sharpened.
Mortising
Moderately easy; tools must be cautiously sharpened.
Nailing
No particular problem.
Gluing
Glues well if basic gluing technical rules are followed.
Sanding
Easy to perform; it gives good results.
Polishing
Can be polished without surface preparation.
Response To Hand Tools
No particular problems.
REFERENCED USES
End Uses Summary
HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, cores, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, handicrafts, door core, coffin, moldings, cementboard
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Joists
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Frames
- 16 - Woods of the World
Steps
- 17 - Tree Conservation Database
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Fittings
- 19 - Silica in Timbers
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Furniture, Common
- 23 - Handbook of Hardwoods
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Faces
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Cores
- 27 - Embassy of Brazil in Japan
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Heavy Packing
- 47 - Arvores Brasileiras
Pallets
- 48 - The strength properties of timbers
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Door Cores
- 76 - Descripción General y Anatómica de 105 Maderas del Grupo Andino.
Coffin
- 78 - Amazonian Timbers for the International Market
Molding
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
Cementboard
- 81 - Madeiras da Amazônia: descrição do lenho de 40 espécies ocorrentes na Floresta Nacional do Tapajós
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