YUNGU (Drypetes gossweileri)
Nom commercial
Yungu
Nom scientifique (avec auteur)
Drypetes gossweileri Moore
Famille
EUPHORBIACEAE
Noms communs (pays)
Okhuaba (Nigeria); Etekele (Zaire); Boshimi (Zaire); Akot (Gabon); Yungu (Congo); Muyungu (Congo); Olelang (Cameroon)
Synonymes du nom scientifique (avec auteurs)
Drypetes armoracia Pax & K. Hoff.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 32 to 40 m, with diameters up to 120 cm. The bole is up to 30 m in length.
Habitat naturel
Drypetes gossweileri occurs in dense forests on sandy soil.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Tyloses thin walled. Non-vestured pits. Vessels per mm2 10 to 20 (abundant). Scalariform perforation plates with more than Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Non-crystals in axial parenchyma cells. Over 9 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays non-storied. Rays 1 to 4 seriate. Prismatic crystals in the ray cells. Heterogeneous rays and/or multiseriate heterogeneous rays. 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 heartwood is pale yellow, sometimes with brown streaks, it is not demarcated.
Index de Teinte (1 = Noir, 7 = Jaune clair)
7
Grain
Straight; grain has no particular influence on drying, machining and finishing qualities.
Texture
The wood is frequently reported to be fine textured.
Luster
The wood luster is reported to be rather low.
Durabilité naturelle
Moderately durable to decay. Without preservative treatment, this species can be used only under risk of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Moderately resistant to termites attack
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
3
Tensions internes de croissance
Residual growth stresses are absent.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.70
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.79
Défauts dus au séchage
Ease of Drying: Drying is fairly easy; some difficulties could occur when drying too fast. Drying Defects: Risks of resin exudation Kiln Schedules: Schedule proposed as a reference by comparison with well known species taking into account to the general technological behavior of this species.
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
1109
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
136400
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
677
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
93
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
87
Dureté Janka (latérale) 12%TH (kgf)
769
Dureté Janka (extrémités) 12%TH (kgf)
848
OUVRABILITÉ
Sciage
Sawing of this species requires powerful equipment.
Coupe de placage de déroulage
Suitable for veneering.
Placage tranche
Suitable for veneering.
Effet d'émoussement
Slight blunting effect; ordinary tools can be used for sawing and machining.
Usinage
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Rabotage
Moderately easy; tools must be cautiously sharpened.
Moulurage
Moderately easy; tools must be cautiously sharpened.
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
Working with hand tools is difficult.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, common veneer, PACKING, heavy packing, pallets, OTHER AND MUSICAL INSTRUMENTS, door core, coffin, cementboard
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
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
Placage ordinaire
- 29 - Embassy of Ecuador in Japan
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
Cementboard
- 81 - Madeiras da Amazônia: descrição do lenho de 40 espécies ocorrentes na Floresta Nacional do Tapajós
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