BAYUR (Pterospermum acerifolium)
Trade Name
Bayur
Scientific Name
Pterospermum acerifolium Willd.
Family
STERCULIACEAE
Common Names
Tong tao (Thailand); Kanan pling (Thailand); Taungpetwun (Myanmar)
Description Of The Tree
Botanical Description
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 2 meters high.
Natural Habitat
Pterospermum species occur scattered in primary forests or locally abundant in secondary forests, especially on river banks, up to 1,400 m of altitude.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Occasionally tangential diameter of vessel lumina 200 micras or more. Occasionally tangential diameter of vessel lumina 100 micras or less. Occasionally vessels with colored deposits. Occasionally vessels per mm2 less than 6. Simple perfor Occasionally axial parenchyma in marginal or in seemingly marginal bands. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Occasionally apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty Occasionally rays more than 10 per mm (abundant). Occasionally rays of two distinct sizes. Occasionally larger rays more than 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Tile cells. Body ray cells procumbent with one row Fibers with simple to minutely bordered pits.
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Wood Macro Photo Tangential Plane
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Wood Micro Photo Of Transversal Section
Availability
Cites Status
Unrestricted
General Wood Description
Color
The heartwood is pale brown to pale red-brown with a purplish tinge, not clearly demarcated from the paler sapwood.
COLOR INDEX (1=Black, 7=Light yellow,white)
5
Grain
The grain is straight or shallowly interlocked.
Texture
The texture is moderate fine to slightly coarse, even.
Natural Durability
The wood is durable for interior use and reputedly for use under water. The sapwood is susceptible to moderately resistant to Lyctus. The resistance of the wood to termites is variable.
Natural durability index (1= Very high durability, 7=Vey low durability)
4
Resistance To Impregnation
The wood is moderately easy to easy to treat with preservatives.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.57
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.63
Total shrinkage Tangential (Saturated to 0%MC) (%)
7.3
Total shrinkage Radial (Saturated to 0%MC) (%)
4.3
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.7
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
970
Stiffness (MOE) 12%MC (kgf/cm²)
109500
Compression parallel to fiber 12%MC (kgf/cm²)
487
Workability
Sawing
Sawing of this species is easy.
Rotary Veneer Cutting
This timber is reported to be suitable for lamination.
Sliced Veneer
This timber is reported to be suitable for lamination.
Machining
Wood processing is reported to be easy.
Turning
30
Nailing
The nailing properties are rated as good to fair.
Finishing
This species is reported to take a good finish.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, HOUSING GENERAL, beams, joists, boards, flooring, frames, panelling, shutter boards, FURNITURE AND CABINETS, PLYWOOD AND VENEER, TURNING, TOOLS, tool handles, agricultural tools, PACKING, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boats, OTHER AND MUSICAL INSTRUMENTS, paper
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
General Housing
- 10 - Silica in Timbers
Beams
- 11 - Prospect: The wood database
Joists
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Boards
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Flooring
- 14 - Handbook of Hardwoods
Frames
- 16 - Woods of the World
Paneling
- 18 - W3TROPICOS Missouri Botanical Garden
Shutter Boards
- 20 - Prospect: The wood database
Furniture Cabinets
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Turning
- 30 - Embassy of Honduras in Japan
Tools
- 42 - Utilización Industrial de Nuevas Especies Forestales en el Perú.
Tool Handles
- 43 - Maderas de Bolivia (Características y Usos de 55 Maderas Tropicales)
Agricultural Tools
- 44 - Atlas of Peruvian Woods
Packing
- 45 - Recopilación y Análisis de Estudios Tecnológicos de Maderas Peruanas
Containers
- 50 - Properties of imported tropical woods
Truck Body
- 53 - Timbers of the New World
Truck Flooring
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Boats
- 56 - Manual de Identificación de Especies Forestales de la Subregión Andina.
Paper
- 82 - Compilation of Data on the Mechanical Properties of Foreign woods (Part 2) Central and South America.
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