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BAYUR (Pterospermum javanicum)
Nombre comercial
Bayur
Nombre científico (con autor)
Pterospermum javanicum Jungh.
Familia
Sterculiaceae
Nombres Comunes
Bayur (Indonesia); Nwalabyin (Myanmar); Melerang (Malaysia); Letop-letop (Malaysia); Bayur (Malaysia); Wadang (Indonesia)
Nombres científicos sinónimos (con autores)
Pterospermum blumeanum Korth
DESCRIPCIÓN DEL ÁRBOL
Descripción botánica
It is a medium size to large tree, up to 45 meters in length. The bole is often fluted, short or crooked, but sometimes fairly straight and branchless for up to 30 meters. The diameter can be from 100 to 120 cm, with stout buttresses up to 2 meters high.
Hábitat natural
Pterospermum species occur scattered in primary forests or locally abundant in secondary forests, especially on river banks, up to 1,400 m of altitude.
Distribución natural
It is distributed in Myanmar, Thailand, Malaya, Sumatra, Java and Borneo. In Sabah it is frequent and mainly in the East Coast.
IDENTIFICACIÓN DE LA MADERA
Descripción anatómica de la madera
Wood diffuse porous. Tangential diameter of vessel lumina 100 micras or less (very small). Simple perforation plates. Intervessel pits small, 7 micras or less. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Prismatic crystals in non-chambered axial parenchyma cells. Rays storied. Tile cells. Body ray cells procumbent with mostly 2 to 4 rows of upright and/or square marginal cells (Kribs-II). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III).
Disponibilidad
Status de protección por CITES
Unrestricted
DESCRIPCIÓN GENERAL DE LA MADERA
Color
The heartwood is pale brown to pale red-brown with a purplish tinge, not clearly demarcated from the paler sapwood.
Indice de Color (1= Negro, violeta; 7= Amarillo claro, blanco)
4
Grano
The grain is straight or shallowly interlocked.
Veta
The texture is moderately fine to slightly coarse.
Durabilidad Natural
The wood is durable for interior use and reputedly for use under water. It is also resistant to wood-rotting fungi. The sapwood is susceptible to moderately resistant to Lyctus. The resistance of the wood to termites is variable.
Indice de Durabilidad Natural (1=Muy alta, 7=Muy baja)
2
Dificultad para impregnar
The wood is moderately easy to easy to treat with preservatives.
PROPIEDADES FÍSICAS DE LA MADERA
Densidad Básica (Peso anhidro/Vol. saturado) (g/cm³)
0.46
Densidad seca al aire (Peso y volúmen CH12%) (g/cm³)
0.50
Contracción Tangencial Total (Saturado hasta anhidro) (%)
5.8
Contracción Radial Total (Saturado hasta anhidro) (%)
4.0
Defectos por secado
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of distortions.
Estabilidad Dimensional (Contracción Total Tangencial %/Contracción Total Radial %)
1.5
PROPIEDADES QUÍMICAS DE LA MADERA
PROPIEDADES MECÁNICAS DE LA MADERA
Resistencia a flexión (Módulo de ruptura) CH12% (kgf/cm²)
563
Rigidez (Módulo de elasticidad) CH12% (kgf/cm²)
81393
Resistencia a la compresión paralela a la fibra CH12% (kgf/cm²)
293
Resistencia a la compresión perpendicular a la fibra CH12% (kgf/cm²)
48
Cizallamiento radial CH12% (kgf/cm²)
33
Dureza Janka (lados) CH12% (kgf)
236
Dureza Janka (extremos) CH12% (kgf)
310
TRABAJABILIDAD
Corte de chapa rotativa
This timber is reported to be suitable for lamination.
Chapa tranchada
This timber is reported to be suitable for lamination.
Maquinado general
It is easy to machine.
Acabado
It gives a good finishing.
Usos Reportados
USOS FINALES (RESUMEN)
EXTERIOR GENERAL, bridges, HOUSING GENERAL, beams, joists, boards, flooring, FURNITURE AND CABINETS, PLYWOOD AND VENEER, TOOLS, tool handles, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, matches, paper
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
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
MUEBLES Y GABINETES
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
TABLEROS Y CHAPAS
- 25 - Directory of Timber Trade Malaysia
HERRAMIENTAS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Mangos herramientas
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
CONSTRUCCIÓN NAVAL
- 55 - Tropical Timber Atlas of Latin America
Botes
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Cerillas
- 71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement
Pulpa_papel
- 82 - Compilation of Data on the Mechanical Properties of Foreign woods (Part 2) Central and South America.
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