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CONGOTALI (Letestua durissima)
Nombre comercial
Congotali
Nombre científico (con autor)
Letestua durissima H.Lec.
Familia
SAPOTACEAE
Nombres Comunes
Kong-Afane (Gabon); Congotali (Congo)
Nombres científicos sinónimos (con autores)
Pierreodendron durissimum A. Chev; Pierreodendron durissimum A. Chev.; Letestua floribunda Lecomte
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
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.
Hábitat natural
Letestua durissima prefers rain forests.
Distribución natural
This species occurs frequently in southern Gabon and only rarely in other areas.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
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.
Disponibilidad
Status de protección por CITES
Unrestricted
DESCRIPCIÓN GENERAL DE LA MADERA
Color
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).
Indice de Color (1= Negro, violeta; 7= Amarillo claro, blanco)
4
Grano
The grain is highly and systematically interlocked; special care is needed when drying because of frequent risks of distortion.
Veta
The wood is frequently reported to be fine textured.
Brillo
Timber of this species is low in luster.
Durabilidad Natural
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.
Indice de Durabilidad Natural (1=Muy alta, 7=Muy baja)
1
Internal growth stresses
Residual growth stresses are absent.
Contenido de sílice
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
Dificultad para impregnar
Nearly impossible to treat with a too much low penetration of the preservative substances.
PROPIEDADES FÍSICAS DE LA MADERA
Densidad Básica (Peso anhidro/Vol. saturado) (g/cm³)
0.94
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
1.10
Contracción Tangencial Total (Saturado hasta anhidro) (%)
10.8
Contracción Radial Total (Saturado hasta anhidro) (%)
7.8
Defectos por secado
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.
Calendario de Secado
FR-13
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.4
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
1933
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
272177
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
942
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
145
Cizallamiento radial CH12% (kgf/cm²)
130
Dureza Janka (lados) CH12% (kgf)
1525
Dureza Janka (extremos) CH12% (kgf)
1463
TRABAJABILIDAD
Aserrado
Sawing of this species requires powerful equipment.
Corte de chapa rotativa
Not suitable for veneering.
Chapa tranchada
Not suitable for veneering.
Pérdida de filo_romado
Severe blunting effect; stellited blades for sawing and carbide tools for machining are recommended.
Maquinado general
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported. It is recommended to use special tools for cutting.
Cepillado
Rather difficult; special tools are needed.
Moldurado
Moderately easy; tools must be cautiously sharpened.
Taladrado
Moderately easy; tools must be cautiously sharpened.
Escopleado, caja y espiga
Moderately easy; tools must be cautiously sharpened.
Clavado
Pre-boring is necessary.
Encolado
Difficult to glue because of high density.
Lijado
Difficult to obtain very good results because of interlocked grain.
Sacar lustre
Can be polished without surface preparation.
Facilidad para herramientas manuales
Working with hand tools is difficult.
Usos Reportados
USOS FINALES (RESUMEN)
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
Puentes
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
Barandilla
- 6 - Physical and mechanical properties of Eucalyptus deglupta Blume grown in Costa Rica
Crucetas
- 7 - Maderas latinoamericanas. II, Quercus alata Q. costaricensis y Q. eugeniaefolia
Durmientes
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
Pilotes
- 9 - Maderas latinoamericanas. IV, Nectandra sp. Ocotea austinii, Persea sp. aff. vesticula, Persea schiedeana
VIVIENDA GENERAL
- 10 - Silica in Timbers
vigas
- 11 - Prospect: The wood database
Viguetas
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Tablas
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Pisos
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Marcos
- 16 - Woods of the World
Carrocería de camión
- 53 - Timbers of the New World
Pisos de vagones_contenedores
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
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