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MUHIMBI (Cynometra alexandri)
Nombre comercial
Muhimbi
Nombre científico (con autor)
Cynometra alexandri C.H.Wright
Familia
LEGUMINOSAE
Nombres Comunes
Angu (Belgium); Utuna (Zaire); Muhimbi (Uganda)
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
Tree reaches a height of 40 to 45 m, with a wide low-branched crown. The bole is rarely more than 15 m. Trunk diameter is between 100 to 150 cm.
Hábitat natural
Cynometra alexandri usually represents a somewhat dry type of forest, but it also occurs in forest swamps. It is normally a gregarious species.
Distribución natural
From Central and East Africa.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Vestured pits. Vessels per mm2 more than 20 (very abundant). Simple perforation plates. Vessel-ray pits similar to i Axial parenchyma in discontinuous tangential lines. Axial parenchyma storied. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays storied. Rays 1 to 4 seriate. Rays 1 to 2 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 yellowish white, it has a thickness of 5 to 7 cm. The heartwood is pink brown to reddish brown, with darker markings, it is clearly demarcated.
Grano
Straight or highly interlocked, sometimes with an influence on further processing operations.
Veta
Fine texture is reported in this species.
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
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)
0.82
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
0.94
Contracción Tangencial Total (Saturado hasta anhidro) (%)
8.5
Contracción Radial Total (Saturado hasta anhidro) (%)
4.5
Defectos por secado
Ease of Drying: Kiln drying time from green to 12%m.c. is about 10 days for quarter sawn material and 5 days for backsawn stock. If preliminary air drying to 25%m.c. is under taken. Times are reduced to 4 days and 2 days respectively. Drying Defects: The occurrence of some bow & twist make it desirable to stack weighting during drying is suggested. Checking is not a dignificant problem.Good results are obtained with 50mm material, whether by air drying, partial air drying, or full kiln drying.
Calendario de Secado
FR-13
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.9
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
2058
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
178325
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
683
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
Rather difficult; special tools are needed.
Torneado
30
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
Difficult to obtain very good results because of interlocked grain.
Sacar lustre
Can be polished without surface preparation.
Doblar al vapor
This species can be used for steam bending.
Facilidad para herramientas manuales
Working with hand tools is difficult.
Usos Reportados
USOS FINALES (RESUMEN)
EXTERIOR GENERAL, poles, stakes posts, crossties, HOUSING GENERAL, parquet, FURNITURE AND CABINETS, cabinets, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, handicrafts, scale model
EXTERIOR GENERAL
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Postes de transmisión
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Postes cerca
- 5 - Propriedades fisicas e mecanicas da madeira e do contraplacado de Pinus elliottii
Durmientes
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
VIVIENDA GENERAL
- 10 - Silica in Timbers
Parquet
- 15 - Empire Timbers
MUEBLES Y GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Gabinetes
- 24 - Empire Timbers
Torneado
- 30 - Embassy of Honduras in Japan
IMPLEMENTOS DEPORTIVOS
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
HERRAMIENTAS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Mangos herramientas
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Mangos agrícolas
- 44 - Atlas of Peruvian Woods
CONSTRUCCIÓN NAVAL
- 55 - Tropical Timber Atlas of Latin America
Botes
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
artesanía
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Maquetas
- 83 - Algunas caracteristicas fisicomecanicas de la madera de tres especies de la cordillera NeoVolcanica
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