Appearance of Coast Grey Box Timber
The heartwood of Coast Grey Box is a pale brown, sometimes showing a hint of pink, while its sapwood is a lighter shade. With a fine, even texture and an interlocked grain, Coast Grey Box presents a refined, natural appearance. It is typically free of gum veins, giving it a clean and consistent look, ideal for high-traffic or exposed applications.
Common Applications of Coast Grey Box Timber
Highly durable and dense, Coast Grey Box is well-suited for heavy engineering construction, round timber, and sleepers. Its strength and longevity make it a reliable choice for projects requiring structural integrity and endurance, especially in challenging environments.
Workability of Coast Grey Box Timber
While Coast Grey Box offers outstanding durability, its density makes it challenging to work with. The timber can be painted, stained, and polished, though surface preparation and machining should occur just before gluing for optimal results. It is slow to dry but resistant to surface checking, ensuring stability through the drying process. Coast Grey Box is also satisfactory for steam bending, allowing for a range of applications in engineered wood products.
Origin and Availability of Coast Grey Box Timber
Kosny Timber sources Coast Grey Box from sustainably managed native forests along the southern and central coasts of New South Wales and eastern Victoria. Availability is generally limited to these regions, but the timber’s exceptional properties make it well worth the investment for heavy-duty applications.
Very Low | Low | Medium | High | Very High | |
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Tangential : | 8.20% | ||||
Radial : | 3.90% | ||||
Unit Movement Tangential: | 0.42% | ||||
Unit Movement Radial: | 0.31% |
Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
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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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 |
Seasoned: |
1100kg/m3
|
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Unseasoned: |
1200kg/m3
|
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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White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
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Modulus of Rupture - Unseasoned: | 101 MPa |
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Modulus of Rupture - Seasoned: | 163 MPa |
Modulus of Elasticity - Unseasoned: | 17 GPa |
Modulus of Elasticity - Seasoned: | 20 GPa |
Maximum Crushing Strength - Unseasoned: | 53 MPa |
Maximum Crushing Strength - Seasoned: | 87 MPa |
Impact - Unseasoned: | 23 J |
Impact - Seasoned: | 26 J |
Toughness - Unseasoned: | High - 25 Nm and above |
Toughness - Seasoned: | High - 25 Nm and above |
Hardness - Unseasoned: | 10 |
Hardness - Seasoned: | 13 |
Low | Moderate | Reasonably High | High | |
(0 - 5 yrs) | (5 - 15 yrs) | (15 - 25 yrs) | (more than 25 yrs) | |
In-Ground: | ![]() | |||
(0 - 7 yrs) | (7 - 15 yrs) | (15 - 40 yrs) | (More than 40 yrs) | |
Above ground: | ![]() | |||
(0 - 20 yrs, usually < 5) | (21 - 40 yrs) | (41 - 64 yrs) | (More than 60 yrs) | |
Marine Borer Resistance: | ![]() |
Lyctid Borer Susceptibility: | Susceptible |
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Lyctid Borer Susceptibility - Other: | |
Termite Resistance: | Resistant |
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |
EFH Spread-of-Flame Index: | |||||||||||
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 |