Appearance of Southern Blue Gum Timber
The color of Southern Blue Gum ranges from pale straw to brown, often displaying unique blue, green, or grey tinges, with regrowth timber sometimes showing pink hues. The sapwood is paler than the heartwood but may not always be distinct. Grain is typically interlocked, with a medium, even texture, and prominent growth rings on end sections. Plantation timber often shows pinhole markings, adding character to the wood.
Common Applications of Southern Blue Gum Timber
Southern Blue Gum’s hardness and vibrant tones make it an ideal choice for flooring, especially in indoor sports centers and high-traffic venues. It is also widely used in joinery, furniture, and general construction. Additional applications include framing, boatbuilding, handles, piles, posts, sleepers, paving blocks, and wagon building. Its resilience and durability make it suitable for a wide range of structural and decorative uses.
Workability of Southern Blue Gum Timber
Despite its hardness, Southern Blue Gum is relatively easy to work, fix, and dress. However, its density can blunt cutting tools, so using the correct machinery is recommended. The wood requires careful seasoning to prevent collapse and checking on tangential surfaces. It can be challenging to drill and nail but yields smooth, clean holes. With proper selection for straight grain, Southern Blue Gum is suitable for steam bending and produces a smooth finish that readily accepts most standard coatings.
Durability of Southern Blue Gum Timber
Southern Blue Gum is moderately durable, though it is not naturally termite-resistant, and untreated sapwood is prone to Lyctid borer attack. Its density provides resilience and a long service life in both interior and some exterior applications.
Origin and Availability of Southern Blue Gum Timber
Kosny Timber sources Southern Blue Gum from plantations and native forests in southeast Australia, particularly in Tasmania. Its wide commercial availability and impressive versatility make it a reliable choice for both structural and aesthetic projects.
Very Low | Low | Medium | High | Very High | |
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Tangential : | 14.40% | ||||
Radial : | 6.90% | ||||
Unit Movement Tangential: | 0.39% | ||||
Unit Movement Radial: | 0.26% |
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: | F17 | F14 | F11 | F8 | F7 |
Seasoned: | F34 | F27 | F22 | F17 | F14 |
Seasoned: | 970kg/m3 |
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Unseasoned: | 1140kg/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: | 84 MPa |
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Modulus of Rupture - Seasoned: | 146 MPa |
Modulus of Elasticity - Unseasoned: | 15 GPa |
Modulus of Elasticity - Seasoned: | 20 GPa |
Maximum Crushing Strength - Unseasoned: | 43 MPa |
Maximum Crushing Strength - Seasoned: | 83 MPa |
Impact - Unseasoned: | 20 J |
Impact - Seasoned: | 27 J |
Toughness - Unseasoned: | Medium - 15 - 24 Nm |
Toughness - Seasoned: | High - 25 Nm and above |
Hardness - Unseasoned: | 7.3 |
Hardness - Seasoned: | 12 |
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: | Not 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 |