RIKIO (Uapaca paludosa)
Nombre comercial
Rikio
Nombre científico (con autor)
Uapaca paludosa Aubrev.
Familia
EUPHORBIACEAE
Nombres Comunes
Koondi (Sierra Leone); Rikio (Côte d`Ivoire); Bosenge (Zaire); Assam (Gabon); N'sanvi (Congo); Assam (Cameroon)
Nombres científicos sinónimos (con autores)
Uapaca guineensis Müll. Arg.
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
The tree reaches a height of 20 m. The bole is straight, with large stilt roots. The trunk diameter attains 70 cm.
Hábitat natural
Uapaca paludosa is abundant in swampy regions, sometimes found also in the savanna forests.
Distribución natural
West Africa.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
Vessels per mm2 10 to 20 (abundant). Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tyloses thin walled. Tangential diameter of vessel lumina 150 to 200 micras (medium). Vessel-ray pits coarse throughout the ray cell. Occasionally mu Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Non-crystals in axial parenchyma cells. Rays storied. Rays of two distinct sizes. 4 to 10 rays per mm (medium). Larger rays more than 4 seriate. Silica bodies in the ray cells. Non-septate fibers. Fibers with simple to minutely bordered pits.
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Foto macroscópica de la madera, plano tangencial
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Foto microscópica sección transversal de la madera
Disponibilidad
Status de protección por CITES
Unrestricted
DESCRIPCIÓN GENERAL DE LA MADERA
Color
The heartwood is pale-pink or pale-red, it is not clearly demarcated.
Indice de Color (1= Negro, violeta; 7= Amarillo claro, blanco)
4
Grano
Straight or slightly interlocked, sometimes with an influence on further processing operations.
Veta
The wood is mostly coarse in texture.
Brillo
This species is moderate 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 stresses are reported to be absent.
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)
0.68
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
0.76
Defectos por secado
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: No particular risks of drying defects, subject to normal drying conditions. Kiln Schedules: The kiln schedule has been tested.
Calendario de Secado
FR-11
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
1251
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
257923
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
651
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
88
Cizallamiento radial CH12% (kgf/cm²)
107
Dureza Janka (lados) CH12% (kgf)
720
Dureza Janka (extremos) CH12% (kgf)
805
TRABAJABILIDAD
Aserrado
It is easy to saw.
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
Possible difficulties caused by interlocked grain are reported.
Cepillado
Easy; no particular problems.
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
Glues well if basic gluing technical rules are followed.
Lijado
Easy to perform; it gives good results.
Sacar lustre
Needs pre-coating.
Facilidad para herramientas manuales
No particular problems.
Usos Reportados
USOS FINALES (RESUMEN)
EXTERIOR GENERAL, rails, crossarms, crossties, HOUSING GENERAL, beams, joists, boards, flooring, parquet, steps, CONTAINERS, truck bodies, truck flooring, OTHER AND MUSICAL INSTRUMENTS, axle
EXTERIOR GENERAL
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
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
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
Peldaños
- 17 - Tree Conservation Database
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
Ejes
- 73 - Handbook of Hardwoods
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