Hardwood Blackbutt

Blackbutt is a commonly grown hardwood that has attractive colouring from cream to pale brown, sometimes with a slight tinge of pink. Its grain is usually straight and texture its medium and even.

Physical Properties
Dry Density (kg/m3) = 900
Janka Dry Hardness (kn) = 9.1

Janka Dry Hardness is a measure of the force required to press a steel ball into the wood surface to half its diameter. The larger the number the harder the wood.
Please remember that wood is a natural product and as well as variation between different species there will also be variation within a species depending on the growing conditions prevalent.
Hardness varies from 2.8kN for Radiata Pine to 14.0kN for Iron Bark.

Category:

Description

Properties
Species Name
Botanical Name
Colour Range		 Blackbutt
Eucalyptus pilularis
Blonde
Janka (Hardness) Rating – Dry 9.1
Natural Durability Class
In-ground contact
Outside above ground contact		 2
1
Density (kg/m3)
Unseasoned (Green)
Seasoned (Dry)		 1100
880
Strength Group
Unseasoned (Green)
Seasoned (Dry)		 S2
SD2
Joint Group
Unseasoned (Green)
Seasoned (Dry)		 J2
JD2
Fire Indices
Spread-of-Flame Index
Smoke-Developed Index
Critical Radiant Flux
Smoke Development Rate
Group Number
Naturally bushfire-resisting Timber		 9
3
>2.2 and <4.5
<750
3
yes
Tangential Shrinkage % 7.3
Toughness (Nm)
Naturally Unseasoned (Green)
Seasoned (Dried)		 21
22
Naturally Termite Resistant to AS3660
R = Resistant
NR = Non resistant		 R
Naturally Lyctus Susceptible
S = Susceptible
NS = Non susceptible		 NS

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