OKAN (Cylicodiscus gabunensis)
Nombre comercial
Okan
Nombre científico (con autor)
Cylicodiscus gabunensis Harms
Familia
LEGUMINOSAE
Nombres Comunes
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)
Nombres científicos sinónimos (con autores)
Piptadenia gabunensis (Harms) Roberty; Erythrophleum le-testui A. Chev.; Erythrophleum gabunense (Harms) Taub.; Cyrtoxiphus staudtii Harms
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
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.
Hábitat natural
Cylicodiscus gabunensis occurs in rain forests.
Distribución natural
West Africa, from Sierra Leone to Gabon.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
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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Foto macroscópica de la madera, plano tangencial
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Foto microscópica sección transversal de la madera
Disponibilidad
Status de protección por CITES
Unrestricted
DESCRIPCIÓN GENERAL DE LA MADERA
Color
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.
Indice de Color (1= Negro, violeta; 7= Amarillo claro, blanco)
2
Grano
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Veta
The texture is typically medium to coarse.
Brillo
Luster is usually low.
Durabilidad Natural
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.
Indice de Durabilidad Natural (1=Muy alta, 7=Muy baja)
1
Internal growth stresses
No growth stresses are reported in this species.
Contenido de sílice
Silica Content: This timber is reported to have a negligible silica content. Silica contents over 0.05% may affect wood processing. Silica Value: 0
Dificultad para impregnar
Difficult to treat with only a low penetration of the preservative products.
PROPIEDADES FÍSICAS DE LA MADERA
Densidad Básica (Peso anhidro/Vol. saturado) (g/cm³)
0.80
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
0.91
Contracción Tangencial Total (Saturado hasta anhidro) (%)
7.9
Contracción Radial Total (Saturado hasta anhidro) (%)
5.9
Defectos por secado
Ease of Drying: Air drying is rated as good.
Calendario de Secado
FR-12
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.3
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
1367
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
226919
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
835
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
123
Cizallamiento radial CH12% (kgf/cm²)
105
Dureza Janka (lados) CH12% (kgf)
1047
Dureza Janka (extremos) CH12% (kgf)
1085
TRABAJABILIDAD
Aserrado
Sawing of this species requires powerful equipment.
Corte de chapa rotativa
Not suitable for veneering.
Chapa tranchada
Not suitable for veneering.
Pérdida de filo_romado
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Maquinado general
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Cepillado
Rather difficult; special tools are needed.
Moldurado
Moderately easy; tools must be cautiously sharpened.
Torneado
30
Taladrado
Moderately easy; tools must be cautiously sharpened.
Escopleado, caja y espiga
Moderately easy; tools must be cautiously sharpened.
Clavado
Pre-boring is necessary.
Encolado
Difficult to glue because of high density.
Lijado
Easy to perform; it gives good results.
Sacar lustre
Needs pre-coating.
Facilidad para herramientas manuales
Working with hand tools is difficult.
Usos Reportados
USOS FINALES (RESUMEN)
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
VIVIENDA GENERAL
- 10 - Silica in Timbers
vigas
- 11 - Prospect: The wood database
Viguetas
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Tablas
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Pisos
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Marcos
- 16 - Woods of the World
MUEBLES Y GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Muebles finos
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Gabinetes
- 24 - Empire Timbers
Torneado
- 30 - Embassy of Honduras in Japan
artículos torneados
- 31 - Embassy of Colombia in Japan
Artículos torneados
- 32 - Embassy of Cote d`Ivoire in Japan
mangos de cuchillos
- 33 - Embassy of Gabon in Japan
Hormas zapato
- 34 - Embassy of Indonesia in Japan
Carrocería de camión
- 53 - Timbers of the New World
Pisos de vagones_contenedores
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
artesanía
- 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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