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OKOUMé (Aucoumea klaineana)
Nom commercial
Okoumé
Nom scientifique (avec auteur)
Aucoumea klaineana Pierre
Famille
BURSERACEAE
Noms communs (pays)
Okume (Equatorial Guinea); N'goumi (Equatorial Guinea); N'kumi (Congo); Zouga; Uume; Ongoumi; Ojoume; Mofoumou; M`goumi; Koumi; Gaboon wood; Gaboon mahogany; Cape Lomez mahogany; Bengouma; Acoume; N`koumi (Gabon); Moukoumi (Gabon); Gaboon (United Kingdom); N`kumi (Congo); Angouma (Gabon); Okoume (Gabon); N`goumi (Equatorial Guinea)
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 32 to 43 m, sometimes to more than 50 m. The bole is cylindrical and clear to 23 m in length and more. The trunk diameter attains 100 up to 250 cm over large buttresses.
Habitat naturel
Okoumé occurs abundantly in an area covering west and central Gabon and small areas of neighboring countries. It is known or inferred that the harvesting of specimens from the wild for international trade has, or may have, a detrimental impact on the spec
Répartition naturelle
From Cameroon down to the Democratic Republic of the Congo.
Existence de plantations?
It is a long rotation species for plantation. The duration of the rotation is 40 years, to reach 60 cm in diameter.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Tyloses thin walled. Non-vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits large Paratracheal axial parenchyma scanty and/or vasicentric. 4 to 10 rays per mm (medium). Rays non-storied. Rays commonly 2 seriate. Silica bodies in the ray cells. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Septate fibers present. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is greyish white, it has a thickness of 2 to 5 cm. The heartwood is salmon-pink to dark-pink, darkening on exposure, it is clearly demarcated. The silver figure is fine (barely visible).
Index de Teinte (1 = Noir, 7 = Jaune clair)
5
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The texture varies from fine to medium.
Luster
It is reported to be low in luster.
Durabilité naturelle
Slightly durable to decay. This species needs preservative treatment for uses with risks of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Sensible to termites attack. The heartwood is resistant
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
6
Tensions internes de croissance
No growth stresses are reported in this species.
Teneur en silice
Silica Content: Silica presence is reported. Amounts over 0.05% may affect wood processing. Silica Value: 0.17
Résistance à l'imprégnation
Difficult to treat with only a low penetration of the preservative products.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.41
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.44
Retrait tangentiel total (saturé à 0%TH) (%)
6.9
Retrait radial total (saturé à 0%TH) (%)
4.6
Calendrier de séchage en séchoir recommandé
FR-7
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.5
Calendrier de séchage en séchoir
http://www.tropicaltimber.info/wp-content/uploads/2015/09/KD_French.pdf
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
632
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
98819
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
370
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
41
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
58
Dureté Janka (latérale) 12%TH (kgf)
240
Dureté Janka (extrémités) 12%TH (kgf)
336
OUVRABILITÉ
Sciage
It is easy to saw.
Coupe de placage de déroulage
Suitable for slicing and peeling.
Placage tranche
Suitable for slicing and peeling.
Effet d'émoussement
Severe blunting effect; stellited blades for sawing and carbide tools for machining are recommended.
Usinage
Possible difficulties caused by interlocked grain are reported.
Rabotage
Easy; no particular problems.
Moulurage
Easy; no particular problems.
Perçage
Easy; no particular problems.
Mortaisage
Easy; no particular problems.
Clouage
No particular problem.
Collage
Glues well if basic gluing technical rules are followed.
Ponçage
Easy to perform; it gives good results.
Polissage
Can be polished without surface preparation.
Compatibilité avec outils manuels
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, boards, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, Decorative veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, moldings
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Planches
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Cadres
- 16 - Woods of the World
Marches
- 17 - Tree Conservation Database
Panneaux
- 18 - W3TROPICOS Missouri Botanical Garden
Accessoires en bois
- 19 - Silica in Timbers
Volets
- 20 - Prospect: The wood database
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Meubles ordinaire
- 23 - Handbook of Hardwoods
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
Faces (de placage)
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Placage tranché
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
EMBALLAGE
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Embal_lourd
- 47 - Arvores Brasileiras
Emballage, palettes
- 48 - The strength properties of timbers
âme_porte
- 76 - Descripción General y Anatómica de 105 Maderas del Grupo Andino.
Cercueils
- 78 - Amazonian Timbers for the International Market
Moulures
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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