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MALABAYABAS (Tristaniopsis decorticata)
Trade Name
Malabayabas
Scientific Name
Tristaniopsis decorticata (Merr.) Peter
Family
Myrtaceae
Common Names
Malabayabas (Philippines)
Scientific Name Synonyms
Tristania decorticata Merr.
Description Of The Tree
Botanical Description
It is a small to medium-sized tree up to 10 m tall, 40 to 60 cm in diameter. The buttresses are absent.
Natural Habitat
It is a timber species, endemic to the Philippines. It is reported in many types of lowland to lower montane forests, up to 1,300 m of altitude. Rates of habitat loss through logging and shifting cultivation have led to considerable population declines.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 micras or less (very small). Tyloses common. Vestured pits. Vessels per mm2 5 to 20. Vessel-ray pits reticulate and/or foraminate. Simple perforation plates. Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Rays more than 10 per mm (abundant). Rays exclusively uniseriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Fibers with distinctly bordered pits.
Availability
Cites Status
Unrestricted
General Wood Description
Odor
No smell or taste are reported.
Color
The sapwood is light red. The heartwood is light brownish gray to deep brownish gray, turning reddish brown with age.
COLOR INDEX (1=Black, 7=Light yellow,white)
4
Grain
The grain is usually interlocked.
Texture
The wood is mostly fine in texture.
Luster
The wood is fairly glossy.
Natural Durability
It is resistant to the marine borers and termite attack.
Natural durability index (1= Very high durability, 7=Vey low durability)
2
Silica Content
Silica Content: This timber is reported to have a high silica content. Silica contents over 0.05% may affect the wood processing. Silica Value: 0
Resistance To Impregnation
It is reported to be untreatable either with oil or water based preservatives.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
1.03
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
1.23
Total shrinkage Tangential (Saturated to 0%MC) (%)
10.6
Total shrinkage Radial (Saturated to 0%MC) (%)
9.1
Drying Defects
Ease of Drying: Drying is very slow and difficult to perform; defects are frequent. Drying Defects: Risks of checks, distortions and collapse. Kiln Schedules: The kiln schedule has been tested.
Recommended Dry Kiln Schedule
JP-30; US-T3-C2
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
1.2
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
1920
Compression parallel to fiber 12%MC (kgf/cm²)
1040
Compression perpendicular to fiber 12%MC (kgf/cm²)
218
Shear strength radial 12%MC (kgf/cm²)
174
Workability
Sawing
This species is difficult to saw.
Blunting Effect
It has a severe blunting effect on the cutting tools.
Machining
Machining of this species is fair to difficult. It has a high silica content.
Planing
Planing operations are rated as easy to fair.
Turning
30
Nailing
This species needs pre-boring.
REFERENCED USES
End Uses Summary
EXTERIOR GENERAL, bridges, HOUSING GENERAL, flooring, TURNING, TOOLS, tool handles, NAVAL CONSTRUCTION, port pillar, port storage
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
General Housing
- 10 - Silica in Timbers
Flooring
- 14 - Handbook of Hardwoods
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)
Shipbuilding
- 55 - Tropical Timber Atlas of Latin America
Port Pillar
- 61 - Manual de Diseño para Maderas del Grupo Andino
Port Storage
- 62 - Estudio Tecnológico de Maderas del Perú (Zona Pucallpa) Vol I
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