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BAYUR (Pterospermum javanicum)
Nom commercial
Bayur
Nom scientifique (avec auteur)
Pterospermum javanicum Jungh.
Famille
Sterculiaceae
Noms communs (pays)
Bayur (Indonesia); Nwalabyin (Myanmar); Melerang (Malaysia); Letop-letop (Malaysia); Bayur (Malaysia); Wadang (Indonesia)
Synonymes du nom scientifique (avec auteurs)
Pterospermum blumeanum Korth
DESCRIPTION DE L'ARBRE
Description botanique
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.
Habitat naturel
Pterospermum species occur scattered in primary forests or locally abundant in secondary forests, especially on river banks, up to 1,400 m of altitude.
Répartition naturelle
It is distributed in Myanmar, Thailand, Malaya, Sumatra, Java and Borneo. In Sabah it is frequent and mainly in the East Coast.
IDENTIFICATION DU BOIS
Description anatomique du bois
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).
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The heartwood is pale brown to pale red-brown with a purplish tinge, not clearly demarcated from the paler sapwood.
Index de Teinte (1 = Noir, 7 = Jaune clair)
4
Grain
The grain is straight or shallowly interlocked.
Texture
The texture is moderately fine to slightly coarse.
Durabilité naturelle
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.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
2
Résistance à l'imprégnation
The wood is moderately easy to easy to treat with preservatives.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.46
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.50
Retrait tangentiel total (saturé à 0%TH) (%)
5.8
Retrait radial total (saturé à 0%TH) (%)
4.0
Défauts dus au séchage
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of distortions.
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.5
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
563
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
81393
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
293
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
48
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
33
Dureté Janka (latérale) 12%TH (kgf)
236
Dureté Janka (extrémités) 12%TH (kgf)
310
OUVRABILITÉ
Coupe de placage de déroulage
This timber is reported to be suitable for lamination.
Placage tranche
This timber is reported to be suitable for lamination.
Usinage
It is easy to machine.
Finissage
It gives a good finishing.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
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
Ponts
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Pouters
- 11 - Prospect: The wood database
Solives
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Planches
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Planchers
- 14 - Handbook of Hardwoods
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
OUTILS
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Outils_manches
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Allumette
- 71 - Proprietes physiques et mecaniques des bois tropicaux, premier supplement
Papier
- 82 - Compilation of Data on the Mechanical Properties of Foreign woods (Part 2) Central and South America.
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