OKAN (Cylicodiscus gabunensis)
Nom commercial
Okan
Nom scientifique (avec auteur)
Cylicodiscus gabunensis Harms
Famille
LEGUMINOSAE
Noms communs (pays)
Denya (Ghana); Bouemon (Côte d`Ivoire); Edoum (Gabon); N'duma (Congo); Uzhi; Usi; Owese; Osung; Olosan; Olisan; Okain; Odenya; Odekowese; Ode owese; Muduma; Mobonran; Mbeli-deli; Lisan; Kendum; Inbeli-deli; Eyee; Emang; Ekam; Edoum; Doum; Djom; Denya; Bouemon; Boueman; Anyan; Aja-igi; Adum; Adada; N`duma (Congo); Oduma (Gabon); Edum (Gabon); African greenheart (Cameroon); Bokoka (Cameroon); Adoum (Cameroon); Okan (Nigeria); Adadua (Ghana); Benya (Ghana)
Synonymes du nom scientifique (avec auteurs)
Piptadenia gabunensis (Harms) Roberty; Erythrophleum le-testui A. Chev.; Erythrophleum gabunense (Harms) Taub.; Cyrtoxiphus staudtii Harms
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of more than 50 m. The bole is straight, cylindrical and clear to 26 m in length. The trunk diameter attains from 100 to 130 cm, but it may reach over 300 cm above the buttresses.
Habitat naturel
Cylicodiscus gabunensis occurs in rain forests.
Répartition naturelle
West Africa, from Sierra Leone to Gabon.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Brown-colored deposits in heartwood vessels. Vestured pits. Vessels per mm2 less than 6 (rare). Vessel-ray pits similar t Axial parenchyma lozenge-aliform. Axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Non-septate fibers. Fibers with simple to minutely bordered pits.
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Vue macroscopique du bois (plan tangentiel)
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Vue microscopique d'une section transversale du bois
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is greyish pink, it has a thickness of 5 cm. The heartwood is yellow-brown to golden brown, with greenish tinge, it is clearly demarcated. The silver figure is fine.
Index de Teinte (1 = Noir, 7 = Jaune clair)
2
Grain
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Texture
The texture is typically medium to coarse.
Luster
Luster is usually low.
Durabilité naturelle
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
1
Tensions internes de croissance
No growth stresses are reported in this species.
Teneur en silice
Silica Content: This timber is reported to have a negligible silica content. Silica contents over 0.05% may affect wood processing. Silica Value: 0
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)
0.80
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.91
Retrait tangentiel total (saturé à 0%TH) (%)
7.9
Retrait radial total (saturé à 0%TH) (%)
5.9
Défauts dus au séchage
Ease of Drying: Air drying is rated as good.
Calendrier de séchage en séchoir recommandé
FR-12
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.3
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)
1367
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
226919
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
835
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
123
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
105
Dureté Janka (latérale) 12%TH (kgf)
1047
Dureté Janka (extrémités) 12%TH (kgf)
1085
OUVRABILITÉ
Sciage
Sawing of this species requires powerful equipment.
Coupe de placage de déroulage
Not suitable for veneering.
Placage tranche
Not suitable for veneering.
Effet d'émoussement
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Usinage
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Rabotage
Rather difficult; special tools are needed.
Moulurage
Moderately easy; tools must be cautiously sharpened.
Tournage
30
Perçage
Moderately easy; tools must be cautiously sharpened.
Mortaisage
Moderately easy; tools must be cautiously sharpened.
Clouage
Pre-boring is necessary.
Collage
Difficult to glue because of high density.
Ponçage
Easy to perform; it gives good results.
Polissage
Needs pre-coating.
Compatibilité avec outils manuels
Working with hand tools is difficult.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, FURNITURE AND CABINETS, luxury furniture, cabinets, TURNING, ornaments, turned furniture, cutlery, lasts, CONTAINERS, truck bodies, truck flooring, OTHER AND MUSICAL INSTRUMENTS, handicrafts
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Pouters
- 11 - Prospect: The wood database
Solives
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Planches
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Planchers
- 14 - Handbook of Hardwoods
Parquets
- 15 - Empire Timbers
Cadres
- 16 - Woods of the World
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Meubles luxe
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Armoires
- 24 - Empire Timbers
Tournage
- 30 - Embassy of Honduras in Japan
Ornements
- 31 - Embassy of Colombia in Japan
Ornements
- 32 - Embassy of Cote d`Ivoire in Japan
Manches de couverts
- 33 - Embassy of Gabon in Japan
Formes à chaussures
- 34 - Embassy of Indonesia in Japan
Carros_camion
- 53 - Timbers of the New World
Wagons
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Artisanat
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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