Appearance of Yellow Gum Timber
The heartwood of Yellow Gum ranges from yellow to pale brown, often displaying pink and yellow tints around its features. Sapwood is slightly paler, creating a clear distinction from the heartwood. With an interlocked grain and moderately coarse texture, Yellow Gum frequently produces a visually appealing fiddleback figure, making it a unique choice for projects where both strength and aesthetics are valued.
Common Applications of Yellow Gum Timber
Yellow Gum is prized for its hardness and durability, making it ideal for heavy construction. Its uses include posts, wharfage, bridgework, sleepers, and fencing. Though too dense for cabinetry, it is an excellent fuelwood, producing stable coals with minimal sparks. Additionally, Yellow Gum is popular in landscaping, where its long-lasting flowers and ability to serve as a windbreak make it valuable for gardens and natural screens.
Workability of Yellow Gum Timber
Yellow Gum’s density and hardness make it challenging to work. Pre-boring is essential for fixings, and cutter angles on planes may need adjustment. While the timber sands and polishes to a high-quality finish, it is best to glue immediately after dressing for optimal adhesion. Yellow Gum accepts preservative treatments well, enhancing its longevity in outdoor applications.
Durability of Yellow Gum Timber
Class 2 in durability for both in-ground and above-ground applications, Yellow Gum heartwood is resistant to termites. However, its sapwood is vulnerable to Lyctid borer. This high-density timber, drying to approximately 1000 kg/m³, is ideal for projects requiring long-lasting, robust material.
Origin and Availability of Yellow Gum Timber
Kosny Timber sources Yellow Gum from native forests in western Victoria and southern South Australia. Its limited but steady availability in these regions makes it a reliable choice for high-quality, durable timber.
Very Low | Low | Medium | High | Very High | |
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Tangential : | 6.30% | ||||
Radial : | 2.80% | ||||
Unit Movement Tangential: | 0.32% | ||||
Unit Movement Radial: | 0.19% |
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: | F14 | F11 | F8 | F7 | F5 |
Seasoned: | F14 | F11 | F8 | F7 | F5 |
Seasoned: | 1010kg/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: | 87 MPa |
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Modulus of Rupture - Seasoned: | 111 MPa |
Modulus of Elasticity - Unseasoned: | 11 GPa |
Modulus of Elasticity - Seasoned: | 12 GPa |
Maximum Crushing Strength - Unseasoned: | 44 MPa |
Maximum Crushing Strength - Seasoned: | 67 MPa |
Impact - Unseasoned: | 17 J |
Impact - Seasoned: | 9 J |
Toughness - Unseasoned: | |
Toughness - Seasoned: | |
Hardness - Unseasoned: | 9.1 |
Hardness - Seasoned: | 11.6 |
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 |
Critical Radiance Flux - Lower: | >2.2 and <4.5 |
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Critical Radiance Flux - Higher: | ≥4.5 |
Smoke Development Rate: | <750 |
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 |