IDWOOD PROPERTIESGrey BoxRed IronbarkWhite IronbarkSugar Gum
    greybox2.jpg redironbark2.jpg whiteironbark2.jpg sugargum2.jpg
1 Botanical name Eucalyptus mirocarpa Eucalyptus tricarpa Eucalyptus leucoxylon Eucalyptus cladocalyx
2 Heartwood colour Pale brown/orange to reds. Weathers to a silver grey

Dark red to deep resin.
Weathers to a silver grey

Yellowish/browns to pinks. Weathers to a silver grey. Blond to light ginger, some dressings show up subtle
greens and pins.
Weathers to a silver grey.
3 Grain Close grain Close grained Close grain Fine, close, even
4 Texture Medium, some interlocking Medium, some interlocking Medium, some interlocking Fine and decorative
interlocked grain
5 Impact resistance Very high Very high High Very high
6 Electrical resistance Very high Very high High Very high
7 Green density 1170kg/m3 1210kg/m3 1200kg/m3 1200kg/m3
8 Air dry density 1130kg/m3 1140kg/m3 1010kg/m3 1090kg/m3
9 Durability
(rated on a 6 class scale)
Class 1 High Class 1 Class 2 High Class 1
10 Green hardness 11 kN 11 kN 9.1 kN 10 kN
11 Dry hardness 15 kN 13 kN 11 kN High
12 Green structural grade
(or strength)
F22 F27 F22 F27
13 Dry structural grade F34 F27 F22 F27
14 Seasoning Slow to dry Slow to dry Slow to dry Slow to dry
15 Shrinkage Radial 3.5%
Tangential 6.5%
Radial 3.5%
Tangential 7.0%
Radial 3.0%
Tangential 6.0%
Radial 6.0%
Tangential 10.5%
16 White ant resistance Class 2 Class 1 (highest) Class 3 (moderably durable) Class 1 (highest)
17 Workability High density and hardness requires sharp cutters for planing and moulding. Interlocked grain can cause tear-out problems High density and hardness needs sharp cutters for planing and moulding.
Less sanding needed to produce fine surface.
Pre-drill before screwing and nailing