Blackwood

Blackwood is the perfect timber for fine furniture, joinery or a feature floor, radiating a subtle beauty that makes it irresistible to designers. High-quality veneers are used in joinery, cabinet-making and feature panelling.

Boasting a variety of colours ranging from light golden-brown to deep brown (sometimes with a reddish tint) and occasionally showing black streaks, the timber radiates a subtle beauty that makes it irresistible to Tasmanian designers. Additional character results from the grain of the wood, which can be straight or wavy with a natural lustre.

Blackwood is easily worked, very stable and long lasting, and blackwood artefacts are always statements of style and quality.

In addition to the supply of solid sections, the availability of high quality veneers has increased the timber's versatility for use in joinery, cabinet making, and feature panelling. Small cross sections of solid timber are also laminated, particularly for bench tops.

Blackwood Products & Applications

Quality assured Blackwood products are available from these suppliers:

The Tasmanian Timber Quality Assurance Program assesses nominated products for Australian Standards compliance through a quarterly mill audit. Buyers can trust that the guaranteed products from our suppliers come from a company that employs sustainable practices, holds Chain-of-Custody, and Responsible Wood accreditation.

Blackwood Properties

Acacia melanoxylon

For further information click tables marked  

Availability & Appearance
General Availability
Availability is limited, and is constrained by location and style of harvesting operations.
Appearance Grade
Available
Plantation
Not available
Structural Grade
Not usually available
Veneer
Available (multiple thicknesses)
Sizes
Dressed seasoned timber, 19 to 285mm wide by 19 to 45 mm thick is available in lengths up to 5400mm. Most production lengths are less than 3000 mm.
Colour
Heartwood is light brown to dark brown with occasional red tinting. Sapwood is straw coloured.
Grain
Mainly straight, occasionally wavy (fiddleback figure).
Texture
Even and medium.
Density  
Unseasoned
Seasoned
Density (per standard)
870 kg/m3
650 kg/m3
Durability  
Above-Ground
Class 3: 7-15 yrs
In-Ground
Class 4: 0-5 yrs
Susceptible to Lyctid Borer
Yes
Marine Borer Resistance
0-20 yrs (usually 5 yrs)
Termite Resistant
No
Environmental Details
Resource
Native - Wet Eucalypt and Rainforest
Reserves
36% of the total Blackwood forest types are reserved.
Certification
Available
Chain of Custody
Available
Carbon Storage
396 kg/m3
R Values
0.61 (100mm)
Fire Properties  
Average Specific Extinction Area
< 250 m2/kg
Bushfire Resistance
BAL-12.5 & 19 (door and window joinery only)
Critical Radiance Flux - Higher
≥ 4.5 kW/m2
Critical Radiance Flux - Lower
> 2.2 < 4.5 kW/m2
Smoke Development Rate
< 750% per min
EFH Ignitibility: 13
EFH Smoke-Develop Index: 3
EFH Spread-of-Flame Index: 9
Fire Properties Group Number: 3
Joint  
Unseasoned
Seasoned
Joint Group
J3
JD3
Mechanical Properties  
Unseasoned
Seasoned
Hardness (Janka)
4.6 kN
5.9 kN
Impact
12 J
15 J
Maximum Crushing Strength
34 MPa
58 MPa
Modulus of Elasticity (MOE)
12 GPa
14 GPa
Modulus of Rupture (MOR)
72 MPa
110 MPa
Toughness (IZOD)
15 - 24 Nm
15 - 24 Nm
Movement  
Radial
0.16% per 1% MC change
Tangential
0.27% per 1% MC change
Shrinkage  
Radial
1.5%
Tangential
4%
Stress  
Unseasoned
Seasoned
Common Structural Grades
Structural #2: F11
Structural #2: F17
Structural Grades
S1:F14, S2:F11, S3:F8, S4:F7, S5:F5
S1:F22, S2:F17, S3:F14, S4:F11, S5:F8
Strength  
Unseasoned
Seasoned
Strength Group
S4
SD4
Workability
General Workability
Blackwood possesses a deep, lustrous grain and is highly resilient, yet easy to work. Particular care should be taken to avoid inhalation of Blackwood dust.
Bending
A very good bending timber. 25mm material bends well to a radius of 50mm.
Blunting
Moderately high.
Boring
Holes are usually clean and to size.
Finishing
Readily worked to a smooth, resilient finish and readily takes a high polish.
Gluing
Glues satisfactorily with most common adhesives.
Moulding
Surfaces and edges are true, even end grain.
Nailing
Nails well although some seasoned material can tend to split. Nails hold reasonably well.
Planing
Surfaces very smooth and lustrous. Care must be taken to work "with" the grain.
Rebating + Mortising
Cuts very cleanly, giving excellent results.
Sawing
Cuts fairly easily, cleanly and accurately. Moderate feeding forces required.
Turning
Turns very well with sharp arrises and well-finished curves.

Sources: Centre for Sustainable Architecture with Wood (CSAW), Wood Solutions

The Tasmanian Timber Expert Helpline is a free service operated by the Centre for Sustainable Architecture with Wood at the University of Tasmania; providing advice on choosing the right timber, obtaining quotes from suppliers, and troubleshooting problems.

Call the Helpline 1300 041 766

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