For further information click tables marked
Availability & Appearance
Availability is limited, and is constrained by location and style of harvesting operations.
Not usually available
Available (multiple thicknesses)
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.
Heartwood is light brown to dark brown with occasional red tinting. Sapwood is straw coloured.
Mainly straight, occasionally wavy (fiddleback figure).
Even and medium.
Density (per standard)
Class 3: 7-15 yrs
Class 4: 0-5 yrs
Susceptible to Lyctid Borer
Marine Borer Resistance
0-20 yrs (usually 5 yrs)
Native - Wet Eucalypt and Rainforest
36% of the total Blackwood forest types are reserved.
Chain of Custody
Average Specific Extinction Area
< 250 m2/kg
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
Maximum Crushing Strength
Modulus of Elasticity (MOE)
Modulus of Rupture (MOR)
15 - 24 Nm
15 - 24 Nm
0.16% per 1% MC change
0.27% per 1% MC change
Common Structural Grades
Structural #2: F11
Structural #2: F17
S1:F14, S2:F11, S3:F8, S4:F7, S5:F5
S1:F22, S2:F17, S3:F14, S4:F11, S5:F8
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.
A very good bending timber. 25mm material bends well to a radius of 50mm.
Holes are usually clean and to size.
Readily worked to a smooth, resilient finish and readily takes a high polish.
Glues satisfactorily with most common adhesives.
Surfaces and edges are true, even end grain.
Nails well although some seasoned material can tend to split. Nails hold reasonably well.
Surfaces very smooth and lustrous. Care must be taken to work "with" the grain.
Rebating + Mortising
Cuts very cleanly, giving excellent results.
Cuts fairly easily, cleanly and accurately. Moderate feeding forces required.
Turns very well with sharp arrises and well-finished curves.
Sources: Centre for Sustainable Architecture with Wood (CSAW), Wood Solutions