AKPA (Tetrapleura tetraptera)
Nom commercial
Akpa
Nom scientifique (avec auteur)
Tetrapleura tetraptera Taub.
Famille
LEGUMINOSAE
Noms communs (pays)
ighimiakia (Nigeria); Aridan (Nigeria); Esehese (Côte d`Ivoire); Nkouarsa (Gabon); Ezibil (Congo); Badiok (Congo); Angulu (Central African Republic); Kpwa (Cameroon); Essesé (Cameroon); Djaga (Cameroon); Akpa (Cameroon); Prekese; Ossgosha; Kyeke; Kokundui; Kokondu; Ka-segbel; Ka-loma; Imiminje; Ikoho; Ikhememi; Igmikkia; Ighirehimi; Ighimiakia; Esem; Edeminang; Ebuk; Buleu; Budjo; Bubao; Arido; Aridan; Aprekese; Apapa; Angular pod; Akposso; Akpa
Synonymes du nom scientifique (avec auteurs)
Tetrapleura thonningii Benth.; Adenanthera tetraptera Schum. & Thonn.; Adenanthera tetraptera Schumach. & Thonn.
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 30 m. The bole may be up to 10 to 16 m in length, with small and sharp buttresses. The trunk diameter attains 100 cm.
Habitat naturel
Tetrapleura tetraptera occurs in secondary, mixed and fringing forests.
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 Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. Two cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 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). Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is white or grey, it has a thickness of 5 cm. The heartwood is pale red, darkening to a yellow-red or brown color, it is clearly demarcated.
Grain
Straight; grain has no particular influence on drying, machining and finishing qualities.
Texture
The texture of the wood is fine.
Durabilité naturelle
Moderately resistant to termites attack. The heartwood is sensible to Lyctus attacks.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
4
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)
0.56
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.61
Défauts dus au séchage
Ease of Drying: Drying is easy; it can be performed without any problem. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. Kiln Schedules: The kiln schedule has been tested.
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
842
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
511
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
64
Dureté Janka (latérale) 12%TH (kgf)
459
Dureté Janka (extrémités) 12%TH (kgf)
563
OUVRABILITÉ
Sciage
It is 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
Machining of this species is reportedly easy.
Rabotage
Easy; no particular problems.
Moulurage
Rather difficult; special tools are needed.
Tournage
30
Perçage
Rather difficult; special tools are needed.
Mortaisage
Rather difficult; special tools are needed.
Clouage
No particular problem.
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
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, flooring, fittings, FURNITURE AND CABINETS, cabinets, PLYWOOD AND VENEER, cores, TURNING, TOOLS, agricultural tools, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Planchers
- 14 - Handbook of Hardwoods
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.
Armoires
- 24 - Empire Timbers
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
âmes (de placage)
- 27 - Embassy of Brazil in Japan
Tournage
- 30 - Embassy of Honduras in Japan
OUTILS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Outils_agric
- 44 - Atlas of Peruvian Woods
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
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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