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WATTLE (Acacia auriculformis)
Trade Name
Wattle
Scientific Name
Acacia auriculformis A. Cunn. ex Benth.
Family
Leguminosae
Common Names
Krathin-narong (Thailand); Kihia (Sudanese); Akasia (Indonesia); Papua Wattle (United Kingdom); Norther black wattle (United Kingdom)
Scientific Name Synonyms
Racosperma auriculforme
Description Of The Tree
Botanical Description
A medium-sized tree up to 20-30m tall, bole branchlesses for up to 12m, up to 50cm in diameter, barksurface deeply fissured grey or dark grey. When open-grown, tree has deep spreading crown and poor stem form. In Papua New Guinea bole not always straight,
Natural Habitat
A auriculiformis occurs in Eucalyptus savanna, is a main constituent of Accasia-Melaleuca woodlands, and is found on forest edged near swamps, in secondaly growth, in monsoon forest, in grassland with Melaleuca Spp. and is common in coastal savannna at in
Natural Distribution
New-Guinea, Kai Islands and Australia, also planted in plantations, and naturalized in Western Malesia.
Non Timber Uses
Bark contains 13% cold-water-soluble tannin. Good firewood and charcoal. Pulping and paper making properties excellent.
Wood Identification
Anatomic Description Of Wood
Wood diffuse porous. Vessels per mm2 less than 6 (rare). Tangential diameter of vessel lumina 100 to 200 micras. Vessels in radial multiples of 2 to 4. Simple perforation plates. Vestured pits. Paratracheal axial parenchyma scanty and/or vasicentric. Axial parenchyma thin vasicentric. Occasionally axial parenchyma aliform. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 4 to 10 rays per mm (medium). Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Ray width 1 to 3 cells. Non-septate fibers.
Availability
Cites Status
Unrestricted
General Wood Description
Color
Sapwood wide, somewhat paler then heartwood. Timber light brown. Sapwood is up to 60mm wide, narrower in other species.
Grain
Grain may be straight on wavy.
Texture
Texture fine.
Natural Durability
Liable to marine borer attack but mostly termite resistant. Attacked by Gano-derma lucidum, a root fungus. Sapwood permeable, heartwood moderately permeable.
Natural durability index (1= Very high durability, 7=Vey low durability)
3
Internal Growth Stresses
Tension wood fibers common.
Wood Physical Properties
Basic Density or Specific Gravity (O.D. weight/vol. green) (g/cm³)
0.64
Air-dry Density (Weight and volume at 12%MC) (g/cm³)
0.58
Total shrinkage Tangential (Saturated to 0%MC) (%)
4.0
Total shrinkage Radial (Saturated to 0%MC) (%)
2.0
Dimensional stability ratio (Total Tangential Shrinkage %/Total Radial Shrinkage %)
2.0
Wood Chemical Properties
Wood Mechanical Properties
Bending Strength (MOR),12%MC (kgf/cm²)
750
Stiffness (MOE) 12%MC (kgf/cm²)
107000
Compression parallel to fiber 12%MC (kgf/cm²)
460
Shear strength radial 12%MC (kgf/cm²)
117
Workability
Sawing
Board tend to split when sawn.
REFERENCED USES
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