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AWOURA (Julbernardia pellegriniana)
Nom commercial
Awoura
Nom scientifique (avec auteur)
Julbernardia pellegriniana Troupin
Famille
LEGUMINOSAE
Noms communs (pays)
Zebreli (France); Zebrali (for sliced veneers) (France); Zebreli (Germany); Zebrali (for sliced veneers) (Germany); Awoura (Gabon); Ekop-Beli (Cameroon); Zebreli; Erop-beli; Beli; Awoura
Synonymes du nom scientifique (avec auteurs)
Paraberlinia bifolialata Pellegr.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 25 to 30 m, with diameters up to 150 cm. The bole is straight, cylindrical but occasionally slightly curved, up to 10 to 15 m in length. Small buttresses are present.
Habitat naturel
Julbernardia pellegriniana is a dominant tree, forming large forests or in smaller groups in coastal areas.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits Axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays exclusively uniseriate. Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is yellowish white, it has a thickness of 3 to 5 cm. The heartwood is brown with yellowish veins, it is clearly demarcated.
Index de Teinte (1 = Noir, 7 = Jaune clair)
4
Grain
It has highly interlocked grain.
Texture
This species is usually reported to have a medium texture.
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 stresses are reported to be absent.
Teneur en silice
Silica Content: Negligible content of silica is reported. Amounts 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)
0.69
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.77
Retrait tangentiel total (saturé à 0%TH) (%)
8.9
Retrait radial total (saturé à 0%TH) (%)
4.3
Défauts dus au séchage
Ease of Drying: Reported that air drying is good. Boards of 13 mm and 38 mm thick take respectively 2.5 months and 6 months. Drying Defects: Slight risk of surface checking. Risk of warping and splitting has been reported but is probably does not pose a problem.
Calendrier de séchage en séchoir recommandé
FR-7
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
2.1
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)
1308
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
181890
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
696
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
96
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
108
Dureté Janka (latérale) 12%TH (kgf)
746
Dureté Janka (extrémités) 12%TH (kgf)
829
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
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
Easy; no particular problems.
Tournage
30
Perçage
Easy; no particular problems.
Mortaisage
Easy; no particular problems.
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, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, Decorative veneer, TURNING, ornaments, turned furniture, CONTAINERS, truck bodies, truck flooring
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
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
Carros_camion
- 53 - Timbers of the New World
Wagons
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
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