|Acacia mollissima syn. A. mearnsii|
Other Common Names: None.
Distribution: Native to Australia but extensively planted in East and South Africa and elsewhere.
The Tree: A small tree 20 to 50 ft high.
General Characteristics: Heartwood pale brown with a pinkish tinge; not sharply demarcated from the sapwood. Grain commonly interlocked; luster medium; texture moderately fine and uniform; without distinctive odor or taste.
Weight: Basic specific gravity (overdry weight/green volume) 0.60; air-dry density 45 pcf.
Mechanical Properties: (2-cm standard)
Moisture content Bending strength Modulus of elasticity Maximum crushing strength
(%) (Psi) (1,000 psi) (Psi)
Green (35) 11,550 1,620 5,170
12% 17,500 2,080 8,800
Janka side hardness 1,280 lb for green material and 1,750 lb at 12% moisture content.
Drying and Shrinkage: Dries rapidly but with pronounced warp, particularly cupping. Shakes tend to open and knots to split slightly. Kiln schedule T2-D4 is suggested for 4/4 stock and T2-D3 for 8/4. No data on shrinkage available but reported to have a large movement.
Working Properties: No data available on machining characteristics but tests in Australia indicate its suitability for cutting into veneer.
Durability: Heartwood nondurable; sapwood vulnerable to Lyctus beetle attack.
Preservation: Reported to be moderately resistant to preservative treatments.
Uses: Mining props, flooring parquet and strips, hardboard. Mainly cultivated for the rich tannin content of the bark, reaching 40 to 50%.
Additional Reading: (17), (35)
17. Farmer, R. H. (Editor). 1972. Handbook of hardwoods. H. M. Stationery Office, London.
35. Lavers, G. M. 1967. The strength properties of timbers. For. Prod. Res. Bull. No. 50. H. M. Stationery Office. London.
From: Chudnoff, Martin. 1984. Tropical Timbers of the World. USDA Forest Service. Ag. Handbook No. 607.