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IZOMBé (Testulea gabonensis)
Nom commercial
Izombé
Nom scientifique (avec auteur)
Testulea gabonensis Pellegr.
Famille
OCHNACEAE
Noms communs (pays)
Zombé (Gabon); Ossakogha (Gabon); N'komi (Gabon); Mogongou (Gabon); Izombe (Gabon); N'gwaki (Congo); Rone (Cameroon); N`gwaki (Congo); Akewe (Gabon); N`komi N`komi (Gabon); Ake (Gabon); Izombe
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 40 m. The bole is cylindrical, straight and clear to 10 to 20 m in length, buttressed. The trunk diameter attains 100 to 130 cm.
Habitat naturel
Testulea gabonensis occurs in areas of primary forest and transitional formations. It is found in dense, mixed, equatorial forests. It is known or inferred that the harvesting of specimens from the wild for international trade has, or may have, a detrimen
Répartition naturelle
West Africa, in Gabon, Republic of Congo and Cameroon.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Vessels per mm2 more than 20 (very abundant). Simple perforation plates. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Non-crystals in axial parenchyma cells. 5 to 8 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Prismatic crystals in radial alignment in procumbent ray cells (chambered cells). Prismatic crystals in the ray cells. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with distinctly bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The heartwood is pink yellow to orange yellow, it is not 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
This species is reported to have a fine to medium texture.
Luster
The surface of the wood is naturally low in luster.
Durabilité naturelle
Durable to decay; this species can be utilized without preservative treatment for exterior joinery or similar uses. Resistant to termites attack. The heartwood is sensible 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: Negligible contents of silica are found in timber of this species. Amounts over 0.05% may affect the wood processing. Silica Value: 0.01
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)
0.65
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.72
Retrait tangentiel total (saturé à 0%TH) (%)
6.9
Retrait radial total (saturé à 0%TH) (%)
4.0
Calendrier de séchage en séchoir recommandé
FR-8
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.7
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)
1019
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
133425
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
620
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
83
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
78
Dureté Janka (latérale) 12%TH (kgf)
644
Dureté Janka (extrémités) 12%TH (kgf)
737
OUVRABILITÉ
Sciage
It is moderately easy to saw.
Coupe de placage de déroulage
Suitable for slicing.
Placage tranche
Suitable for slicing.
Effet d'émoussement
Slight blunting effect; ordinary tools can be used for sawing and machining.
Usinage
Machining of this species is reportedly easy.
Rabotage
Moderately easy; tools must be cautiously sharpened.
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
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, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, Decorative veneer, TURNING, ornaments, turned furniture, cutlery, lasts, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boats, boat hulls, boat deck, port storage, OTHER AND MUSICAL INSTRUMENTS, handicrafts, 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
Planchers
- 14 - Handbook of Hardwoods
Parquets
- 15 - Empire Timbers
Cadres
- 16 - Woods of the World
Marches
- 17 - Tree Conservation Database
Panneaux
- 18 - W3TROPICOS Missouri Botanical Garden
Accessoires en bois
- 19 - Silica in Timbers
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
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
Placage tranché
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
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
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Navires_coques
- 57 - Estadísticas de Aprovechamiento, Exportación y comercialización Nacional de Productos Forestales
Navires_ponts
- 59 - Programa Nacional de uso Sostenible de los Bosques e Incremento a las Exportaciones.
Port entreposage
- 62 - Estudio Tecnológico de Maderas del Perú (Zona Pucallpa) Vol I
Artisanat
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Moulures
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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