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Brown mallet is a
small to medium-sized tree, 10-25 m in height and with diameter at
breast height (dbh) to 0.7 m, occasionally up to 30 m tall and diameter
1 m. Found in south-west Western Australia on the drier, inland side of
the jarrah (E. marginata) forest, in the 300 to 400 mm rainfall zone.
It occurs from north-west of York to Narrogin and Wagin, south to GMT
Barker and east to near Kondinin, Lake Grace and Ravensthorpe. About 8000
ha of plantations were established near Narrogin.
Wood
description [more
info]
Heartwood is light red-brown to dark grey-brown, with reddish streaks,
and the sapwood is up to 30 mm wide and distinctly paler.
Wood
density [more
info]
Green density is about 1120 kg/m3, air-dry density about 980 kg/m3,
and basic density about 770 kg/m3 (published figures). In comparison,
CALM Timber Technology measured 1130 kg/m3, 1090 kg/m3 and 865 kg/m3 for
the three densities.
Shrinkage
[more
info]
Tangential and radial shrinkage before reconditioning are 7.1 and
5.5 per cent respectively, and after reconditioning 4.4 and 3.6 per cent
respectively.
Workability
[more
info]
With workability, the timber is rather hard
to work but dresses well. The grain is often interlocked and the
timber is easy to dry.
Durability
[more
info]
The Durability Class based on the CSIRO 1996
ratings is 2/1 for <decay, and 2 for decay + termites.
Strength
group and properties [more
info]
Green and dry strength groups are S1 and SD2. The more important strength
properties are given in the table below.
|
Property
|
Units
|
Green
|
Dry
|
|
Modulus
of Rupture
|
MPa
|
113
|
179
|
|
Modulus
of Elasticity
|
MPa
|
15000
|
19000
|
|
Max
Crushing Strength
|
MPa
|
53
|
94
|
|
Hardness
|
KN
|
9.9
|
15
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Uses
[more
info]
Uses have been for
general construction (particularly on farms), tool handles, mining timbers
and fuel. The bark has high tannin content (40 per cent or more), and
this could be used for tanning leather and for adhesives manufacture.
Availability
[more
info]
There is limited availability in Western Australia, and
timber is generally marketed around the Narrogin area.
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