Timber Species - Blackbutt

Blackbutt :: Eucalyptus pilularis

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.


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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Blackbutt