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MABIN/PTERYGOTA (Pterygota horsfieldii)
Trade Name
Mabin/Pterygota
Scientific Name
Pterygota horsfieldii (R.Br.) Kosterm.
Family
STERCULIACEAE
Common Names
Impa (Papua New Guinea); Melebu (Malaysia)
Scientific Name Synonyms
Pterygota trinervia K Schumann; Pterygota thwaitesii (Mast.) Alston; Pterygota forbesii F. v. Mueller
Description Of The Tree
Botanical Description
It is a deciduous, monoecious, medium-sized to large tree up to 50 m tall. The bole is cylindrical to tapering, up to 120 cm in diameter and branchless for up to 36 m, with thin, small to tall buttresses.
Natural Habitat
It is found in riparian forests and secondary formations. It is a native of Irian Jaya and Papua New Guinea.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Tangential diameter of vessel lumina 200 micras or more (large). Vessels per mm2 less than 6 (rare). Simple perforation plates. Vessel-ray pits similar to intervessel pits in size and shape. Intervessel pits small, 7 micras or less. Paratracheal axial parenchyma scanty and/or vasicentric. Occasionally axial parenchyma confluent. Axial parenchyma storied. Prismatic crystals in non-chambered axial parenchyma cells. Occasionally two cells per parenchyma strand. 3 to 4 cells per parenchyma st 4 to 10 rays per mm (medium). Occasionally rays of two distinct sizes. Ray height more than 1 mm. Larger rays more than 4 seriate. Sheath cells. Prismatic crystals in radial alignment in procumbent ray cells (chambered cells). Occasionally body ray cells procum Fibers with simple to minutely bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Odor
Fresh wood has an unpleasant smell.
Color
The sapwood varies from straw to buff, not clearly demarcated. The heartwood is cream to pale brown.
Grain
The grain is reported to be straight or shallowly interlocked.
Texture
Texture is usually medium to coarse.
Natural Durability
Logs are very susceptible to blue-stain, termite and pinhole borer attack, unless rapidly removed from forest or given protective treatment.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Resistance To Impregnation
This species can be impregnated fairly easily.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.63
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.70
Total shrinkage Tangential (Saturated to 0%MC) (%)
10.3
Total shrinkage Radial (Saturated to 0%MC) (%)
4.0
Drying Defects
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of distortions.
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.6
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
917
Stiffness (MOE) 12%MC (kgf/cm²)
135935
Compression parallel to fiber 12%MC (kgf/cm²)
418
Compression perpendicular to fiber 12%MC (kgf/cm²)
69
Shear strength radial 12%MC (kgf/cm²)
100
Janka hardness (side) 12%MC (kgf)
505
Workability
Sawing
The wood has a tendency to tear when quarter sawing boards with interlocked grain.
Rotary Veneer Cutting
Slicing is possible, but it may not be satisfactory due to the presence of harder and softer zones.
Sliced Veneer
Slicing is possible, but it may not be satisfactory due to the presence of harder and softer zones.
Blunting Effect
It is reported to gum up the saw-teeth. The blades must be cleaned frequently.
Planing
The response of this species to planing operations is good to fair. It tends to tear on radial boards with interlocked grain.
Moulding
It can be used for molding with satisfactory results.
Turning
30
Finishing
It finishes satisfactorily after filling
Steam Bending
Steam bending properties are poor.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, bridges, poles, crossties, HOUSING GENERAL, flooring, steps, panelling, shutter boards, FURNITURE AND CABINETS, cabinets, PLYWOOD AND VENEER, TURNING, SPORTS, TOOLS, tool handles, agricultural tools, PACKING, pallets, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, port storage, OTHER AND MUSICAL INSTRUMENTS, handicrafts, shoes, moldings
Exterior General
- 1 - Tabela de resultados de ensaios fisicos e mecanicos
Bridges
- 2 - 25 madeiras da amazonia de valor comercial, caracterizacao, macroscopica, usos comuns e indices qualificativos
Poles
- 3 - Estudo dendrologico e determinacao das caracteristicas fisicas e mecanicas do genipapo (Genipa americana)
Crossties
- 8 - Maderas latinoamericas. III, Podocarpus standleyi ,Podocarpus oleifolius, Drims granadensis, Magnolia poasana y Didymopanax pittieri
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
Steps
- 17 - Tree Conservation Database
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.
Cabinet
- 24 - Empire Timbers
Panels, Veneers
- 25 - Directory of Timber Trade Malaysia
Turning
- 30 - Embassy of Honduras in Japan
Sports
- 38 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
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
Pallets
- 48 - The strength properties of timbers
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
Port Storage
- 62 - Estudio Tecnológico de Maderas del Perú (Zona Pucallpa) Vol I
Handcraft
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
Shoes
- 70 - Proprietes physiques et mecaniques des bois tropicaux de l`union francaise
Molding
- 79 - Padronização da Nomenclatura Comercial Brasileira das Madeiras Tropicais Amazônicas, Sugestão
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