Coast grey box is a highly durable Australian hardwood often used for heavy construction applications and as round timber.
Bosisto's Box, Gippsland Green Box
Eucalyptus bosistoana
![](/sites/default/files/styles/detail_image/public/Eucalyptusbosistoana.jpg?itok=PKekPPNT)
Coast grey box is a tough, highly durable large Australian hardwood. It grows in eastern Victoria and along the southern and central coast of New South Wales.
Its heartwood is a pale brown with the sapwood paler in appearance. It has a fine and even texture and usually features an interlocked grain. Gum veins are rarely present. It is similar in appearance to grey box, Eucalyptus moluccana.
Coast grey box is also a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. It is also satisfactory for steam bending.
Coast grey box is used for heavy construction, round timber and sleepers. Like Grey Box, it is mainly available in the areas it grows.
Shrinkage
Very Low | Low | Medium | High | Very High | |
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Tangential : |
8.20%
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Radial : |
3.90%
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Unit Movement Tangential: |
0.42%
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Unit Movement Radial: |
0.31%
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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: |
F22 |
F22 |
F17 |
F14 |
F11 |
Seasoned: |
F34 |
F34 |
F27 |
F22 |
F17 |
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: |
1100kg/m3
|
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Unseasoned: |
1200kg/m3
|
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: |
101
|
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Modulus of Rupture - Seasoned: |
163
|
Modulus of Elasticity - Unseasoned: |
17
|
Modulus of Elasticity - Seasoned: |
20
|
Maximum Crushing Strength - Unseasoned: ![]() |
53
|
Maximum Crushing Strength - Seasoned: |
87
|
Impact - Unseasoned: |
23
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Impact - Seasoned: |
26
|
Toughness - Unseasoned: |
High - 25 Nm and above
|
Toughness - Seasoned: |
High - 25 Nm and above
|
Hardness - Unseasoned: |
10
|
Hardness - Seasoned: |
13
|
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: |
Resistant
|
Fire Properties
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
EFH Spread-of-Flame Index: |
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EFH Smoke-Developed Index: |
1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
Fire Properties Group |
Average Specific Extinction Area: |
<250
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Bushfire Resistance: |
BAL 12.5 and 19 – All AS3959 required applications
|
Coast grey box features heartwood that is pale brown, sometimes with a tinge of pink. The sapwood is paler in appearance. It has a fine, even texture and usually features an interlocked grain. Gum veins are rarely present.
Coast grey box is very similar in appearance to grey box, Eucalyptus moluccana.
Tough and highly durable, Coast grey box is mainly used for heavy engineering construction and round timber. It is also used for sleepers.
Coast grey box is a highly dense species so it is quite difficult to work. It can be painted, stained and polished. Any machining or surface preparation should be done immediately prior to gluing. It is slow to dry but generally will not develop any surface checking. Coast grey box is also satisfactory for steam bending.
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