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ALEP (Desbordesia glaucescens)
Nombre comercial
Alep
Nombre científico (con autor)
Desbordesia glaucescens Van Tiegh.
Familia
IRVINGIACEAE
Nombres Comunes
Banga (Zaire); Alep (Gabon); Banga (Congo); Omang (Cameroon); Teva; Oteva; Omang; Oman; Kawo; Bwiba njoc; Banga; Aloi; Alo; Alep
Nombres científicos sinónimos (con autores)
Irvingia glaucescens Engl.; Desbordesia soyauxii van Tiegh.; Desbordesia pierreana van Tiegh.
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
The tree reaches a height of 46 m, with diameters up to 100 to 170 cm. The bole is straight, clear, cylindrical, up to 23 m in height. As the tree grows older, the small but well developed buttresses hold the tree upright.
Hábitat natural
Desbordesia glaucescens occurs in alluvial areas, in dense evergreen forest and in transitional formations.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 200 micras or more (large). Non-vestured pits. Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits larger than the interve 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 bands more than 3 cells wide. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. 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.
Disponibilidad
Status de protección por CITES
Unrestricted
DESCRIPCIÓN GENERAL DE LA MADERA
Color
The sapwood is yellowish to pale brown . The heartwood is pale brown with some dark veins, it is not clearly demarcated.
Grano
Straight or sometimes interlocked. Usually interlocked grain is absent or very slight, without any effect on further processing operations.
Veta
The wood is frequently reported to be fine textured.
Brillo
The wood is described as 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
For this species no growth stresses are reported.
Contenido de sílice
Silica Content: Negligible content of silica is reported. Amounts over 0.05% may affect wood processing. Silica Value: 0.01
Dificultad para impregnar
Difficult to treat with only a low penetration of the preservative products.
PROPIEDADES FÍSICAS DE LA MADERA
Densidad Básica (Peso anhidro/Vol. saturado) (g/cm³)
0.90
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
1.05
Contracción Tangencial Total (Saturado hasta anhidro) (%)
10.9
Contracción Radial Total (Saturado hasta anhidro) (%)
6.8
Defectos por secado
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of casehardening and checks Kiln Schedules: The kiln schedule has been tested.
Calendario de Secado
FR-11
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.6
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
1596
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
238390
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
817
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
119
Cizallamiento radial CH12% (kgf/cm²)
145
Dureza Janka (lados) CH12% (kgf)
1383
Dureza Janka (extremos) CH12% (kgf)
1353
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
Moderate blunting effect; stellited blades for sawing and carbide tools for machining are advised.
Maquinado general
It needs powerful tools for processing. Possible difficulties caused by interlocked grain are reported.
Cepillado
Rather difficult; special tools are needed.
Moldurado
Rather difficult; special tools are needed.
Taladrado
Rather difficult; special tools are needed.
Escopleado, caja y espiga
Rather difficult; special tools are needed.
Clavado
Pre-boring is necessary.
Encolado
Difficult to glue because of high density.
Lijado
Easy to perform; it gives good results.
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, poles, rails, crossarms, crossties, piers, HOUSING GENERAL, beams, joists, boards, 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
Postes de transmisión
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
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
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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