WALABA (Eperua spp)
Nom commercial
Walaba
Nom scientifique (avec auteur)
Eperua spp.
Famille
LEGUMINOSAE
Noms communs (pays)
Copaíba-Clara (Brazil); Wallaba; Wapa; Espadeira (Brazil); Eperu (Brazil); Bainha De Espada (Brazil); Gebaru; Wallaba; Walaba; Uapa Tabaco; Palo Machete; Jebaro; Itusi Wallaba; Epeau; Bijlhout; Apazeiro (Brazil); Apa (Brazil); Wouapa; Woapa; Wapa Huileux; Wapa Patouve; Wapa Gras; Wapa; Soft Wallaba
DESCRIPTION DE L'ARBRE
Description botanique
The trees are reported to reach heights of 30 m, with trunk diameters ranging from 45 to 70 cm. They develop well-formed and cylindrical boles that are 15 to 20 m long.
Habitat naturel
Eperua trees are gregarious and dominant. They prefer acidic sandy soils in creek valleys and high savanna forests.
Répartition naturelle
The geographical range for this genus is the Guyanas and the northern Brazilian Amazon basin.
Usages non ligneux
resin canals in line, with important exudations
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Vessels solitary and in short radial multiples. Tangential diameter of vessel lumina 150 to 200 micras (medium). Vessels per mm2 6 to 10 (medium). Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and shape. Int Paratracheal axial parenchyma thin vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. Axial parenchyma bands more than 3 cells wide. 4 to 10 rays per mm (medium). Rays 1 to 4 seriate. Heterogeneous rays and/or multiseriate heterogeneous rays. Fibers with simple to minutely bordered pits.
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Vue macroscopique du bois (plan radiale)
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Vue microscopique d'une section transversale du bois
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The color of the heartwood is commonly red brown, with darker resinous markings.
Index de Teinte (1 = Noir, 7 = Jaune clair)
3
Grain
The grain is frequently straight.
Texture
Texture is described as medium.
Durabilité naturelle
It is very durable against decay. This species is very resistant against termites and it is not attacked by Lyctus.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
1
Tensions internes de croissance
Growth stresses present in the tree may cause the log to burst on the butt.
Résistance à l'imprégnation
This timber is reported to respond poorly to preservative treatment.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.75
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.85
Retrait tangentiel total (saturé à 0%TH) (%)
6.8
Retrait radial total (saturé à 0%TH) (%)
2.2
Calendrier de séchage en séchoir recommandé
UK-B; US-T2-C2
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
3.1
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
1533
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
154600
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
715
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
87
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
98
Dureté Janka (latérale) 12%TH (kgf)
862
Dureté Janka (extrémités) 12%TH (kgf)
753
OUVRABILITÉ
Sciage
Resin present in wood may clog the saw-teeth
Effet d'émoussement
The wood has a moderate blunting effect.
Rabotage
Planing operations are not difficult if dry wood is processed (limited resin exudation ).
Clouage
Good nail-holding, but pre-boring is necessary.
Collage
This species is easy to glue.
Polissage
Polishing can give satisfactory results after suitable sanding and filling.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
EXTERIOR GENERAL, crossties, HOUSING GENERAL, boards, flooring, steps, FURNITURE AND CABINETS, CONTAINERS, cooperage, NAVAL CONSTRUCTION, OTHER AND MUSICAL INSTRUMENTS, handicrafts, shingle
EXTERIOR GENERAL
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Traverses de chemin de fer
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
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
Marches
- 17 - Tree Conservation Database
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
CONTENANTS
- 50 - Properties of imported tropical woods
Tonnellerie
- 51 - Recopilacion de propiedades mecanicas de maderas creciendo en Chile
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Artisanat
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Shingles
- 77 - Amazonian Timbers, Characteristics and Utilization Volume I; Tapajós National Forest
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