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DABEMA (Piptadeniastrum africanum)
Nom commercial
Dabema
Nom scientifique (avec auteur)
Piptadeniastrum africanum Brenan
Famille
LEGUMINOSAE
Noms communs (pays)
Mbele (Sierra Leone); Guli (Sierra Leone); Beyae (Guinea); Odan (Ghana); Elae (Ghana); Dabema (Côte d`Ivoire); Odan (United Kingdom); Elae (United Kingdom); Ekhimi (United Kingdom); Agboin (United Kingdom); N'singa (Congo); Koungou (Central African Republic); N'singa (Angola); Wunga; To; Singa; Sanga; Redwood; Odanwoma; Odannan; Odane; Odan; Nga; N-go; Mussasae; Musese; Mugeye; Mbele-guli; Koungou; Ka-bari; K-kuperb; Jondo; Itoumb?; Gau; Erundu; Eran; Elany; Elae; Ekhivi; Dubima; Dane; Dandad; Chen; Bokungo; Bokundu; Bi-eh; Banzu; Akasanumu; Agbion; African greenheart; Bokungu (Zaire); N`inga (Angola); N`singa (Congo); Toum (Gabon); Tom (Equatorial Guinea); Atui (Cameroon); Mbeli (Liberia); Ekhimi (Nigeria); Agboin (Nigeria); Dahoma (Ghana); Debema (Côte d`Ivoire); Bukundu (Netherlands); Ekhim (United Kingdom); Dahoma (United Kingdom); Mpewere (Uganda); Likundu (Zaire); Dabema
Synonymes du nom scientifique (avec auteurs)
Piptadenia africana Hook. f.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 26 to 32 m, with trunk diameters up to 130 cm. The bole is cylindrical, straight, and slightly buttressed.
Habitat naturel
Piptadeniastrum africanum is found in rain forest and transitional formations, often as a solitary emergent tree in farmland and secondary bush.
Répartition naturelle
West, Central and East Africa, from Senegal to Angola and Uganda.
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). Vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits Axial parenchyma lozenge-aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Larger rays more than 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Occasionally septate fibers present. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Odeur
Unpleasant odor of ammoniac.
Teinte
The sapwood is light color, it has a thickness of 5 or more cm. The heartwood is light brown to yellow-brown, it is clearly demarcated. The silver figure is fine (barely visible).
Index de Teinte (1 = Noir, 7 = Jaune clair)
5
Grain
The grain is highly and systematically interlocked; special care is needed when drying because of frequent risks of distortion.
Texture
This wood has a somewhat coarse texture.
Luster
This wood is frequently low in luster.
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. Resistant to termites attack. The hear
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
3
Tensions internes de croissance
This species is reported to have growth stresses.
Teneur en silice
Silica Content: Negligible content of silica is reported. Amounts over 0.05% may affect wood processing. Silica Value: 0
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)
0.63
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.70
Retrait tangentiel total (saturé à 0%TH) (%)
8.5
Retrait radial total (saturé à 0%TH) (%)
3.8
Défauts dus au séchage
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of casehardening and 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)
2.2
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)
994
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
154862
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
583
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
76
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
106
Dureté Janka (latérale) 12%TH (kgf)
611
Dureté Janka (extrémités) 12%TH (kgf)
707
OUVRABILITÉ
Sciage
It is moderately easy to saw.
Coupe de placage de déroulage
Not suitable for veneering.
Placage tranche
Not suitable for veneering.
Effet d'émoussement
Slight blunting effect; ordinary tools can be used for sawing and machining.
Usinage
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
Difficult to obtain very good results because of interlocked grain.
Polissage
Needs pre-coating.
Cintrage à la vapeur
This species can be used for steam bending.
Compatibilité avec outils manuels
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
EXTERIOR GENERAL, rails, HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, steps, FURNITURE AND CABINETS, common furniture, CONTAINERS, truck bodies, truck flooring
EXTERIOR GENERAL
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MEUBLES ET M. DE RANGEMENT
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Solives
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Planches
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Planchers
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Parquets
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Cadres
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Marches
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MEUBLES ET M. DE RANGEMENT
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Meubles ordinaire
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Carros_camion
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Wagons
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
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