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EYOUM (Dialium pachyphyllum)
Nombre comercial
Eyoum
Nombre científico (con autor)
Dialium pachyphyllum Harms
Familia
LEGUMINOSAE
Nombres Comunes
Pau veludo (Guinea-Bissau); Kofina (Côte d`Ivoire); Afambéou (Côte d`Ivoire); Kasudu (Zaire); Bongola (Zaire); Omvong (Gabon); Eyoum (Gabon); Penzi (Congo); Mfang (Cameroon); M'fan (Cameroon); Ziba (Mozambique)
Nombres científicos sinónimos (con autores)
Dialium yambataense Vermoesen; Dialium polyanthum Harms; Dialium macranthum A. Chev.
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
The tree reaches a height of 13 to 30 m. The bole is straight and 6 to 12 m long, with small buttresses and occasional minor fluting and claw roots expending from base. The trunk diameter reaches from 70 to 100 cm.
Hábitat natural
Dialium pachyphyllum occurs in marshy sites and dense rain forests.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Brown-colored deposits in heartwood vessels. Vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plates. V Axial parenchyma in marginal or in seemingly marginal bands. Axial parenchyma in continuous tangential lines or fine bands. Axial parenchyma storied. Siliceous bodies in the axial parenchyma cells. 3 to 4 cells per parenchyma strand. Axial parenchyma bands mor 4 to 10 rays per mm (medium). Rays storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). 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 pale yellow-white or light brown, it has a thickness of 3 to 5 cm. The heartwood is varying shades of brown, it is clearly demarcated.
Indice de Color (1= Negro, violeta; 7= Amarillo claro, blanco)
3
Grano
Straight or slightly interlocked; grain has no particular influence on drying, machining and finishing qualities.
Veta
The wood is typically medium in texture.
Brillo
Luster is reported to be low.
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.
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)
0.89
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
1.03
Contracción Tangencial Total (Saturado hasta anhidro) (%)
9.7
Contracción Radial Total (Saturado hasta anhidro) (%)
5.3
Defectos por secado
Ease of Drying: Shrinkage during air drying is moderate.
Calendario de Secado
FR-12
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.8
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
1910
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
267839
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
1126
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
184
Cizallamiento radial CH12% (kgf/cm²)
100
Dureza Janka (lados) CH12% (kgf)
1340
Dureza Janka (extremos) CH12% (kgf)
1320
TRABAJABILIDAD
Aserrado
Sawing of this species requires powerful equipment.
Corte de chapa rotativa
Suitable for slicing.
Chapa tranchada
Suitable for slicing.
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.
Cepillado
Rather difficult; special tools are needed.
Moldurado
Moderately easy; tools must be cautiously sharpened.
Torneado
30
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
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, paling, stakes posts, rails, crossarms, crossties, piers, HOUSING GENERAL, beams, flooring, parquet, frames, steps, PLYWOOD AND VENEER, Decorative veneer, TURNING, ornaments, PACKING, heavy packing, CONTAINERS, cooperage, 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)
Poste de palizada
- 4 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas da bicuiba
Postes cerca
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
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
Pisos
- 14 - Handbook of Hardwoods
Parquet
- 15 - Empire Timbers
Marcos
- 16 - Woods of the World
Peldaños
- 17 - Tree Conservation Database
TABLEROS Y CHAPAS
- 25 - Directory of Timber Trade Malaysia
chapa decorativa
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
Torneado
- 30 - Embassy of Honduras in Japan
artículos torneados
- 31 - Embassy of Colombia in Japan
PALLETS_EMBALAJES
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Envase pesado
- 47 - Arvores Brasileiras
Duelas toneles
- 51 - Recopilacion de propiedades mecanicas de maderas creciendo en Chile
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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