
Black wattle (Acacia mollissima)
Family: Leguminosae
Common names: Acacia, Basboom, Black wattle, Green wattle, Swartwattel, Tan wattle, Wattle
Distributed in: Australia, India, South Africa, Sri Lanka (Africa, Oceania and S.E. Asia)
Distribution overview: Black wattle is native to Southeast Australia (Victoria to New South Wales and southern Queensland) and Tasmania, but has been extensively planted in East and South Africa and elsewhere.
Common uses: Boxes and crates, Charcoal, Chemical derivatives, Cooperages, Domestic flooring, Factory flooring, Flooring, Flooring: industrial heavy traffic, Fuelwood, Furniture, Hardboards, Mine timbers, Parquet flooring, Poles, Posts, Pulp/Paper products, Sub-flooring, Tannin, Tool handles
Product sources: Black wattle is also cultivated principally for its bark which yields tannin
Environment profile: Status has not been officially assessed
Tree size: Tree height is 20-30 m
Colors: the heart isYellow, Yellow to golden-yellow to orangeand the sapwoodPale brown, Red.The grain isOther figure, the textureUniformand the lusterMedium
Natural durability: Susceptible to termite attack, Very little natural resistance
Odor: No specific smell or taste
Kiln Schedules: Drying (speed) is fast
Kiln Drying Rate: Naturally dries slowly
Drying Defects: Shakes, Splitting
Ease of Drying: Thick Stock Requires Care
Boring: Fairly easy to very easy
Carving: Fairly Easy to Very Easy
Cutting Resistance: Easy to saw
Mortising: Fairly Easy to Very Easy
Moulding: Fairly Easy to Very Easy
Movement in Service: Fairly Easy to Very Easy
Nailing: Pre-Boring Recommended, Pre-boring necessary
Planing: Moderately easy to plane
Resistance to Impregnation: Sapwood is permeable
Response to hand tools: Fairly Difficult to Difficult to Work
Routing recessing: Fairly Easy to Very Easy
Screwing: Pre-boring necessary, Pre-boring recommended; Turning: Fairly Easy to Very Easy
Polishing: Good;
- Numerical data Metric
- Numerical data English
- Strength properties
- References
 |
 |
 |
 |
Item |
Green |
Dry |
Metric |
Specific Gravity |
0,58 |
|
|
Density |
|
737 |
kg/m3 |
Bending Strength |
760 |
1252 |
kg/cm2 |
Crushing Strength |
64 |
116 |
kg/cm2 |
Hardness |
|
752 |
kg |
Impact Strength |
137 |
137 |
cm |
Shearing Strength |
|
170 |
kg/cm2 |
Stiffness |
117 |
151 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
|
|
% |
Weight |
|
|
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
|
468 |
cm-kg |
Static Bending |
321 |
500 |
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | 10811 | 17821 | psi | Crushing Strength | 921 | 1651 | psi | Density | | 46 | lbs/ft3 | Hardness | | 1659 | lbs | Impact Strength | 54 | 54 | inches | Maximum Crushing Strength | 5771 | 9115 | psi | Shearing Strength | | 2430 | psi | Static Bending | 4567 | 7120. | psi | Stiffness | 1672 | 2153 | 1000 psi | Toughness | | 407 | inch-lbs | Specific Gravity | 0.58 | | | Weight | 46 | 45 | lbs/ft3 | |
Density (dry weight) = 46-52 lbs/cu. ft. 1 Max. crushing strength = high Hardness (side grain) = medium Shearing strength (parallel to grain) = medium Bending strength (MOR) = medium Modulus of Elasticity (stiffness) = medium Bending strength (MOR) = high Modulus of Elasticity (stiffness) = high Toughness-Hammer drop (Impact strength)= high Toughness (total work)= very high Modulus of Elasticity (stiffness) = low Max. crushing strength = medium Density (dry weight) = 38-45 lbs/cu. ft.
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