< Retour CONGOTALI (Letestua durissima) Version imprimable
CONGOTALI (Letestua durissima)
Nom commercial
Congotali
Nom scientifique (avec auteur)
Letestua durissima H.Lec.
Famille
SAPOTACEAE
Noms communs (pays)
Kong-Afane (Gabon); Congotali (Congo)
Synonymes du nom scientifique (avec auteurs)
Pierreodendron durissimum A. Chev; Pierreodendron durissimum A. Chev.; Letestua floribunda Lecomte
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 40 to 50 m, with trunk diameter from 130 up to 200 cm. The bole is usually straight, cylindrical and high, with a fluted base.
Habitat naturel
Letestua durissima prefers rain forests.
Répartition naturelle
This species occurs frequently in southern Gabon and only rarely in other areas.
IDENTIFICATION DU BOIS
Description anatomique du bois
Occasionally vessels in diagonal and/or radial pattern. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Tyloses thin walled. Tyloses common. Non-vestured pits. Vessels per mm2 6 to 10 (medium Axial parenchyma in continuous tangential lines or fine bands. Prismatic crystals in short chains in chambered axial parenchyma cells. Over 9 cells per parenchyma strand. Axial parenchyma in narrow bands on lines up to 3 cells wide. Axial parenchyma bands ove 4 to 10 rays per mm (medium). Rays non-storied. Rays commonly 2 seriate. Silica bodies in the ray cells. Heterogeneous rays and/or multiseriate heterogeneous rays. Non-septate fibers. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is pale brown, it has a thickness of 5 to 8 cm. The heartwood is reddish brown to brown, it is clearly demarcated. The silver figure is fine (barely visible).
Index de Teinte (1 = Noir, 7 = Jaune clair)
4
Grain
The grain is highly and systematically interlocked; special care is needed when drying because of frequent risks of distortion.
Texture
The wood is frequently reported to be fine textured.
Luster
Timber of this species is low in luster.
Durabilité naturelle
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
1
Tensions internes de croissance
Residual growth stresses are absent.
Teneur en silice
Silica Content: Presence of silica is reported in timber of this species. Amounts over 0.05% may affect the wood processing. Silica Value: 0.18
Résistance à l'imprégnation
Nearly impossible to treat with a too much low penetration of the preservative substances.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.94
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
1.10
Retrait tangentiel total (saturé à 0%TH) (%)
10.8
Retrait radial total (saturé à 0%TH) (%)
7.8
Défauts dus au séchage
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of distortions when interlocked grain is present. Kiln Schedules: The kiln schedule has been tested.
Calendrier de séchage en séchoir recommandé
FR-13
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.4
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)
1933
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
272177
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
942
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
145
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
130
Dureté Janka (latérale) 12%TH (kgf)
1525
Dureté Janka (extrémités) 12%TH (kgf)
1463
OUVRABILITÉ
Sciage
Sawing of this species requires powerful equipment.
Coupe de placage de déroulage
Not suitable for veneering.
Placage tranche
Not suitable for veneering.
Effet d'émoussement
Severe blunting effect; stellited blades for sawing and carbide tools for machining are recommended.
Usinage
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported. It is recommended to use special tools for cutting.
Rabotage
Rather difficult; special tools are needed.
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
Difficult to glue because of high density.
Ponçage
Difficult to obtain very good results because of interlocked grain.
Polissage
Can be polished without surface preparation.
Compatibilité avec outils manuels
Working with hand tools is difficult.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
EXTERIOR GENERAL, bridges, rails, crossarms, crossties, piers, HOUSING GENERAL, beams, joists, boards, flooring, parquet, frames, CONTAINERS, truck bodies, truck flooring
EXTERIOR GENERAL
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Ponts
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
Rampe
- 6 - Physical and mechanical properties of Eucalyptus deglupta Blume grown in Costa Rica
Crosses
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Traverses de chemin de fer
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
Piliers
- 9 - Maderas latinoamericanas. IV, Nectandra sp. Ocotea austinii, Persea sp. aff. vesticula, Persea schiedeana
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
Carros_camion
- 53 - Timbers of the New World
Wagons
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Please Provide Information To View Producer Information