Assumed, Wood Working Properties & Specifications

Acacia mollissima

Black Wattle

Family: Myrtaceae

Distribution: Native to Australia but extensively planted in East and South Africa and elsewhere.

The Tree: A small tree 20 to 50 ft high.

The Wood: 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.

 

 

 

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