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GOMBé (Didelotia letouzeyi)

Nom commercial

Gombé

Nom scientifique (avec auteur)

Didelotia letouzeyi Pellegr.

Famille

LEGUMINOSAE

Noms communs (pays)

Timba (Sierra Leone); Bondu (Liberia); Broutou (Côte d`Ivoire); Angok (Gabon); Ekop-gombé (Cameroon); Gombé

DESCRIPTION DE L'ARBRE

Description botanique

The tree may reach a height of 50 m, with diameters from 100 to 170 cm. The bole is clear to 26 m, straight and cylindrical. The buttresses are thick and usually short.

Habitat naturel

Didelotia letouzeyi occurs in mixed virgin forests, but never in great quantities.

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 Occasionally axial parenchyma in marginal or in seemingly marginal bands. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma lozenge-aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per pare Rays more than 10 per mm (abundant). Rays and/or axial elements irregularly storied. Rays non-storied. Rays exclusively uniseriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with one row of upright and/o Non-septate fibers. Fibers with simple to minutely bordered pits.

  • Vue macroscopique du bois (plan tangentiel)
  • Vue microscopique d'une section transversale du bois

Disponibilité

Statut CITES

Unrestricted

DESCRIPTION GÉNÉRALE DU BOIS

Teinte

The sapwood is red-brown to pale brown, it has a thickness of 5 to 7.5 cm. The heartwood is pale red-brown with a greenish tint near the sapwood, it is clearly demarcated.

Index de Teinte (1 = Noir, 7 = Jaune clair)

5

Grain

Straight or slightly interlocked; grain has no particular influence on drying, machining and finishing qualities.

Texture

The wood is mostly coarse in texture.

Luster

Luster is reported to be low.

Durabilité naturelle

Slightly durable to decay. This species needs preservative treatment for uses with risks of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Sensible to termites attack. The heartwood is resistant

Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)

6

Tensions internes de croissance

For this species no growth stresses are reported.

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)

0.59

Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)

0.65

Retrait tangentiel total (saturé à 0%TH) (%)

8.4

Retrait radial total (saturé à 0%TH) (%)

4.9

Défauts dus au séchage

Ease of Drying: It takes about 4 months to air dry boards 15 mm thick. Kiln Schedules: For kiln drying, a temperature of 40.5 to 65.5 degrees is recommended with corresponding relative humidity of 85% to 40%.

Calendrier de séchage en séchoir recommandé

FR-7

Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)

1.7

PROPRIÉTÉS CHIMIQUES DU BOIS

PROPRIÉTÉS MÉCANIQUES DU BOIS

Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)

947

Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)

152274

Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)

561

Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)

72

Résistance au cisaillement (radial) 12%TH (kgf/cm²)

73

Dureté Janka (latérale) 12%TH (kgf)

523

Dureté Janka (extrémités) 12%TH (kgf)

624

OUVRABILITÉ

Sciage

It is easy to saw.

Coupe de placage de déroulage

Suitable for slicing, also suitable for peeling if treated.

Placage tranche

Suitable for slicing, also suitable for peeling if treated.

Effet d'émoussement

Slight blunting effect; ordinary tools can be used for sawing and machining.

Usinage

Machining of this species is reportedly easy.

Rabotage

Moderately easy; tools must be cautiously sharpened.

Moulurage

Easy; no particular problems.

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

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)

HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, steps, panelling, fittings, shutter boards, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, Decorative veneer, PACKING, heavy packing, pallets, 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
Volets
  • 20 - Prospect: The wood database
MEUBLES ET M. DE RANGEMENT
  • 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Meubles ordinaire
  • 23 - Handbook of Hardwoods
PANNEAUX ET PLACAGE
  • 25 - Directory of Timber Trade Malaysia
Faces (de placage)
  • 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Placage tranché
  • 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
EMBALLAGE
  • 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Embal_lourd
  • 47 - Arvores Brasileiras
Emballage, palettes
  • 48 - The strength properties of timbers
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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