Brown stringybark is a moderately durable Australian hardwood, used in general building construction and for fuel.
Eucalyptus blaxlandii, Eucalyptus capitellata
Eucalyptus baxteri
![](/sites/default/files/styles/detail_image/public/EucalyptusbaxteriBrownStringybark.jpg?itok=cs-aIXV_)
Brown stringybark is a hardwood species occurring in coastal and high-rainfall regions of southern New South Wales, Victoria, South Australia and Kangaroo Island. It can grow to heights of up to 40 metres.
As its trade name suggests, brown stringybark heartwood is pale brown in colour. Its texture is medium and even, with considerable variation in grain. Gum veins are common.
Brown stringybark timber exhibits moderate strength and durability, and is not recommended for in-ground applications. The sapwood of the species, not always visually distinct from the true wood, is immune to lyctid borer (powder post beetle) attack.
Although the timber of this species is not especially difficult to work, common applications are limited to general construction, notably building framework, and firewood.
Brown stringybark timber products are readily available throughout Victoria, and parts of New South Wales and South Australia.
Shrinkage
Very Low | Low | Medium | High | Very High | |
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Tangential : |
10.40%
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Radial : |
5.10%
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Unit Movement Tangential: |
0.33%
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Unit Movement Radial: |
0.24%
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Strength Group
![Strength groups are given for unseasoned (S1-S7) and seasoned (SD1-SD8) timber in accordance with AS 2878. S1 and SD1 yield the highest strength and stiffness whereas S7 and SD8 yield the lowest.](/themes/custom/woodsolutions/images/tooltip.png)
Very High |
High |
Reasonably High |
Medium High |
Medium |
Reasonably Low |
Low |
Very Low |
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Unseasoned: |
S1 |
S2 |
S3 |
S4 |
S5 |
S6 |
S7 |
S8 |
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Seasoned: |
SD1 |
SD2 |
SD3 |
SD4 |
SD5 |
SD6 |
SD7 |
SD8 |
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Stress Grade
![A stress grade is defined in AS 1720 as the classification of timber for structural purposes by means of either visual or machine grading. The stress grade indicates the basic working stresses and stiffnesses to be used for structural design purposes. Measured in MPa.](/themes/custom/woodsolutions/images/tooltip.png)
Structural No. 1 |
Structural No. 2 |
Structural No. 3 |
Structural No. 4 |
Structural No. 5 |
|
Unseasoned: |
F17 |
F14 |
F11 |
F8 |
F7 |
Seasoned: |
F27 |
F22 |
F17 |
F14 |
F11 |
Density per Standard
![Seasoned density is based on moisture content of 12%. Unseasoned density is an approximation as it depends on the moisture content at the time of measurement. Measured kg/m3.](/themes/custom/woodsolutions/images/tooltip.png)
Seasoned: |
840kg/m3
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Unseasoned: |
1150kg/m3
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Joint Group
![The joint group is a classification of the strength of a species in joint design. The values are from 1 (very high strength) to 6 (very low strength).](/themes/custom/woodsolutions/images/tooltip.png)
Very High |
High |
Reasonably High |
Medium |
Low |
Very Low |
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Unseasoned: |
J1 |
J2 |
J3 |
J4 |
J5 |
J6 |
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Seasoned: |
JD1 |
JD2 |
JD3 |
JD4 |
JD5 |
JD6 |
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Colour
![The colour of seasoned heartwood can vary between species and often within a species. The information provided should be used as a general guide only. In most cases, the colour of sapwood is either a lighter shade of the heartwood or a white/cream colour.](/themes/custom/woodsolutions/images/tooltip.png)
White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
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Mechanical Properties
Modulus of Rupture - Unseasoned: |
73
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Modulus of Rupture - Seasoned: |
126
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Modulus of Elasticity - Unseasoned: |
13
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Modulus of Elasticity - Seasoned: |
17
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Maximum Crushing Strength - Unseasoned: ![]() |
39
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Maximum Crushing Strength - Seasoned: |
70
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Impact - Unseasoned: |
15
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Impact - Seasoned: |
17
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Toughness - Unseasoned: |
Medium - 15 - 24 Nm
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Toughness - Seasoned: |
Medium - 15 - 24 Nm
|
Hardness - Unseasoned: |
5.4
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Hardness - Seasoned: |
7.5
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Durability
Low | Moderate | Reasonably High | High | |
(0 - 5 yrs) | (5 - 15 yrs) | (15 - 25 yrs) | (more than 25 yrs) | |
In-Ground: |
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(0 - 7 yrs) | (7 - 15 yrs) | (15 - 40 yrs) | (More than 40 yrs) | |
Above ground: |
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(0 - 20 yrs, usually < 5) | (21 - 40 yrs) | (41 - 64 yrs) | (More than 60 yrs) | |
Marine Borer Resistance: |
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Lyctid Borer Susceptibility: |
Not Susceptible |
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Lyctid Borer Susceptibility - Other: |
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Termite Resistance: |
Not Resistant
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Fire Properties
Group Number - Other: |
3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-
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Average Specific Extinction Area: |
<250
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Bushfire Resistance: |
BAL 12.5 and 19 – All AS3959 required applications
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The heartwood of this brown stringybark is a pale brown colour. Sapwood may not be clearly defined. Its texture is medium and even with considerable variation in grain. Gum veins are common.
Brown stringybark is commonly used for building framework and for fuel.
Brown stringybark is not difficult to work.
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