Size of Tree/ Type of Forest : Marri is commonly referred to as ‘red gum’. Marri is usually a medium sized to tall tree up to 40 metres in height with flaky grey bark, widely distributed in the South West of Western Australia in the jarrah and karri forests

Wood Description : Heartwood is pale yellow to light brown to reddish brown, with sapwood bands up to 40mm wide, usually sufficiently paler to be distinguishable from the heartwood.

Wood Density: Green density (kg/cubic m ): About 1,200kg/cubic m

: Air Dry Density (kg/cubic m): About 850kg/cubic m

: Basic Desnity (kg/cubic m): About 650 kg/cubic m

Shrinkage :         Tangential and radial shrinkage before reconditioning are 6.5 and 3.5 per cent respectively, and after reconditioning 5.6 and 3.4 per cent respectively

Durability :      Durability class in-ground 3, above-ground 3. Based on AS5604:2005

Strength groups: Green and Dry strength groups are S3 and SD3

Property                                          Units      Green          Dry

Modules of Rupture MPa 78 125
Modules of Elasticity MPa 14,000 17,000
Max Crushing Strength MPa 41 66
Hardness (Janka) kN 6.6 7.1


Source : Forest Products Commission WA