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WENGé (Millettia laurentii)
Nom commercial
Wengé
Nom scientifique (avec auteur)
Millettia laurentii De Wild.
Famille
LEGUMINOSAE
Noms communs (pays)
Wengè (France); Wengè (United Kingdom); Wengè (Germany); Wengè (Zaire); Wengè (Congo); Awoung (Cameroon); Tshikalakala; Otogo; Nsou-so; Nson-so; N`toka; N`gondou; Mukonde mutshi; Monkonge; Kiboto; Bwengu; Awong; Anong; Panga-panga (United Kingdom); Panga-panga (Germany); Panga-panga (France); Wenge (United Kingdom); Wenge (Germany); Wenge (France); Mpande (Tanzania); Jambire (Mozambique); Wenge (Zaire); Wenge (Congo)
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 16 to 32 m. The bole is usually straight, unbuttressed. The trunk diameter attains 100 cm.
Habitat naturel
Millettia laurentii is found in semi-deciduous, sometimes in periodically inundated swampy forests. It is known or inferred that the harvesting of specimens from the wild for international trade has, or may have, a detrimental impact on the species by EI
Répartition naturelle
Central Africa and southern regions of Tanzania, Mozambique, also in the Republic of Congo.
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). White deposits in heartwood vessels. Vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel- Axial parenchyma in thick bands. Axial parenchyma storied. Two cells per parenchyma strand. Axial parenchyma bands more than 3 cells wide. 4 to 10 rays per mm (medium). Rays storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with over 4 rows of upright and/or square marginal cells (Kribs-I). Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is whitish, it has a thickness of 2 to 3 cm. The heartwood is yellowish brown toning down to purplish brown, with pink-brown thin stripes, it is clearly demarcated.
Index de Teinte (1 = Noir, 7 = Jaune clair)
2
Grain
Straight; grain has no particular influence on drying, machining and finishing qualities.
Texture
The texture of the wood is frequently coarse.
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 residual growth stresses are found.
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: 0.01
Résistance à l'imprégnation
Nearly impossible to treat with a too much low penetration of the preservative substances.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.77
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.87
Retrait tangentiel total (saturé à 0%TH) (%)
9.1
Retrait radial total (saturé à 0%TH) (%)
5.9
Défauts dus au séchage
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of checks. Kiln Schedules: Schedule proposed as a reference by comparison with well known species taking into account to the general technological behavior of this species.
Calendrier de séchage en séchoir recommandé
FR-13
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.5
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)
1464
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
214523
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
865
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
129
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
118
Dureté Janka (latérale) 12%TH (kgf)
949
Dureté Janka (extrémités) 12%TH (kgf)
1003
OUVRABILITÉ
Sciage
Sawing of this species requires powerful equipment.
Coupe de placage de déroulage
Suitable for slicing.
Placage tranche
Suitable for slicing.
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, boards, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, Decorative veneer, TURNING, ornaments, turned furniture, cutlery, lasts, OTHER AND MUSICAL INSTRUMENTS, handicrafts
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
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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