Mountain gum is an Australian hardwood timber species, useful for various applications ranging from furniture and flooring to general construction.
White Mountain Gum, Kindlingbark
Eucalyptus dalrympleana
![](/sites/default/files/styles/detail_image/public/EucalyptusdalrympleanaMountainGum.jpg?itok=5safsQd-)
Mountain gum is a hardwood tree reaching heights of up to 50 metres in favourable conditions. It occurs naturally in Queensland, New South Wales, Victoria and Tasmania.
The heartwood of this species is pale pink or pinkish brown in colour; sapwood is visually indistinct. The texture of this straight-grained timber ranges from fine (latewood) to relatively coarse (earlywood). Growth rings are prominent because of the darker latewood.
Due to its moderate hardness and durability, applications of mountain gum timber include general building construction, joinery, flooring and the fabrication of tool handles. Heartwood lacks natural termite-resistance, and untreated sapwood is susceptible to lyctid borer (powder post beetle) attack.
Mountain gum timber products have limited commercial availability.
Shrinkage
Very Low | Low | Medium | High | Very High | |
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Tangential : |
11.50%
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Radial : |
5.40%
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Unit Movement Tangential: |
0.35%
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Unit Movement Radial: |
0.22%
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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: |
F14 |
F11 |
F8 |
F7 |
F5 |
Seasoned: |
F17 |
F14 |
F11 |
F8 |
F7 |
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: |
690kg/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 |
|
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: |
64
|
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Modulus of Rupture - Seasoned: |
117
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Modulus of Elasticity - Unseasoned: |
9.5
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Modulus of Elasticity - Seasoned: |
13
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Maximum Crushing Strength - Unseasoned: ![]() |
30
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Maximum Crushing Strength - Seasoned: |
57
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Impact - Unseasoned: |
16
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Impact - Seasoned: |
8
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Toughness - Unseasoned: |
Medium - 15 - 24 Nm
|
Toughness - Seasoned: |
Medium - 15 - 24 Nm
|
Hardness - Unseasoned: |
5.2
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Hardness - Seasoned: |
5.7
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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: |
Susceptible |
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Lyctid Borer Susceptibility - Other: |
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Termite Resistance: |
Not Resistant
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Fire Properties
1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
Fire Properties Group |
Group Number - Other: |
3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm
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Average Specific Extinction Area: |
<250
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Bushfire Resistance: |
BAL 12.5 and 19 – Door and window joinery only
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The heartwood of mountain gum, not readily distinguishable from the sapwood, is pale pink or pinkish brown in colour. The texture of this straight-grained timber ranges from fine (latewood) to relatively coarse (earlywood). Growth rings are prominent because of the darker latewood.
Mountain gum timber is suitable for joinery, flooring and general construction applications.
Mountain gum is reasonably easy to work, however gum vein can interfere with its finish, so selection and quality control are factors to consider in uses which bear on the workability level required.
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