BOMANGA (Brachystegia laurentii)
Nom commercial
Bomanga
Nom scientifique (avec auteur)
Brachystegia laurentii Louis
Famille
LEGUMINOSAE
Noms communs (pays)
Bomanga (France); Ariella (for sliced veneers) (France); Ariella (for sliced veneers) (United Kingdom); Ekop-Léké (Cameroon); Ekop-Evène (Cameroon); Nzang (Gabon); Ekop evene (Cameroon); Ariella (United Kingdom); Ariella (France); Bomanga (Zaire); Yegna (Gabon)
Synonymes du nom scientifique (avec auteurs)
Macrolobium laurentii De Wild.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 30 to 40 m, with trunk diameters up to 150 cm. The bole is tall, slender, straight and cylindrical up to 20 m.
Habitat naturel
Brachystegia laurentii occurs in dense rain forest and along rivers.
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). Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and s Axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma lozenge-aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays and/or axial elements irregularly storied. Rays exclusively uniseriate. 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 radiale)
-
Vue microscopique d'une section transversale du bois
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is yellowish white, it has a thickness of 10 to 15 cm. The heartwood is light brown to copper brown, 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 is mostly medium to coarse.
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
No residual stresses are reported in this species.
Teneur en silice
Silica Content: It is reported to have a negligible amount of silica. Contents over 0.05% may affect 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)
0.52
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.57
Retrait tangentiel total (saturé à 0%TH) (%)
5.9
Retrait radial total (saturé à 0%TH) (%)
3.7
Défauts dus au séchage
Ease of Drying: The wood is difficult to season. Drying Defects: Warping, splitting and surface-checking are recorded. Kiln Schedules: Kiln drying at low temperatures is possible.
Calendrier de séchage en séchoir recommandé
FR-7
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.6
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)
920
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
132576
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
493
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
61
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
63
Dureté Janka (latérale) 12%TH (kgf)
396
Dureté Janka (extrémités) 12%TH (kgf)
500
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
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Usinage
Machining of this species is reportedly easy.
Rabotage
Moderately easy; tools must be cautiously sharpened.
Moulurage
Easy; no particular problems.
Tournage
30
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
Needs pre-coating.
Compatibilité avec outils manuels
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, faces, Decorative veneer, TURNING, ornaments, turned furniture, CONTAINERS, cooperage, 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
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
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
Tournage
- 30 - Embassy of Honduras in Japan
Ornements
- 31 - Embassy of Colombia in Japan
Ornements
- 32 - Embassy of Cote d`Ivoire in Japan
Tonnellerie
- 51 - Recopilacion de propiedades mecanicas de maderas creciendo en Chile
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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