Collection: Southern Blue Gum

Southern Blue Gum (Eucalyptus globulus) is one of the world’s most widely planted eucalypt species and a popular choice in Australian plantations, especially in Tasmania’s coastal sclerophyll forests. Originally grown for wood chips, pulp, and paper, Southern Blue Gum has found additional value in timber furniture and flooring due to its durability, density, and attractive appearance.

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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 LowLowMediumHighVery High
    Check markCheck mark
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

Check mark

Seasoned:

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

Check mark
 Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5
Unseasoned:F17F14F11F8F7
Seasoned:F34F27F22F17F14

Seasoned:

970kg/m3

Unseasoned:

1140kg/m3

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

J5

J6

Check mark

Seasoned:

JD1

JD2

JD3

JD4

JD5

JD6

Check mark
 White, yellow, pale straw to light brownPink to pink brownLight to dark redBrown, chocolate, mottled or streaky
  
Check mark
Modulus of Rupture - Unseasoned:84 MPa
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
 LowModerateReasonably HighHigh
 (0 - 5 yrs)(5 - 15 yrs)(15 - 25 yrs)(more than 25 yrs)
In-Ground:Check mark  
 (0 - 7 yrs)(7 - 15 yrs)(15 - 40 yrs)(More than 40 yrs)
Above ground: Check mark 
 (0 - 20 yrs, usually < 5)(21 - 40 yrs)(41 - 64 yrs)(More than 60 yrs)
Marine Borer Resistance:Check mark  
Lyctid Borer Susceptibility:Susceptible
Lyctid Borer Susceptibility - Other: 
Termite Resistance:Not Resistant

Critical Radiance Flux - Lower:

>2.2 and <4.5

Critical Radiance Flux - Higher:

≥4.5

Smoke Development Rate:

<750

1 - non-combustible2 - reasonably non-combustible3 - slightly combustible4 - combustible

Fire Properties Group
Number:

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications