Collection: Sugar Gum

Sugar Gum (Eucalyptus cladocalyx) is a dense, plantation-grown native hardwood known for its strength, durability, and attractive blonde to tan tones. Originating from South Australia, this eucalypt has gained popularity for its high-value sawn timbers, well-suited to both structural and decorative applications. Recognized for its environmental benefits as a sustainable plantation timber, Sugar Gum has become a highly sought-after choice in the Australian timber market.

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Appearance of Sugar Gum Timber

Sugar Gum timber has a fine, even texture and a naturally defect-free appearance, thanks to the self-pruning nature of the species. Its color ranges from blonde to tan, with hints of ginger-orange, green, and pink revealed through finishing. Certain trees exhibit interlocking grain that produces striking figures like bee’s wing and fiddle-back, making Sugar Gum an ideal timber for high-quality furniture and decorative applications.

Common Applications of Sugar Gum Timber

Rated Class 1 for durability, Sugar Gum is valued for its strength and wear resistance, making it suitable for indoor and outdoor furniture, flooring, decking, posts, poles, and stair treads. Its warm appearance and distinctive grain patterns also make it popular for joinery and fine furniture. Architectural veneers crafted from Sugar Gum offer a sustainable option to enjoy its beauty with minimal material use. Additionally, its strength and low defect rate make it ideal for structural applications in posts, beams, and heavy construction.

Workability of Sugar Gum Timber

Due to its density, Sugar Gum is challenging to work and requires pre-drilling with a titanium-coated bit. For optimal results, gluing should be done on freshly machined surfaces, ideally with Titebond aliphatic resin glue. Construction techniques like biscuit-jointed corners, floating panels, and clip-attached tops work well. Finished Sugar Gum performs well outdoors, while organic oils, French polishing, and synthetic finishes enhance its color, bringing out a deep honey tone. When left unfinished, the timber weathers to a silver-grey patina.

Durability of Sugar Gum Timber

Sugar Gum has excellent durability, weathering well outdoors, and is resistant to checking. Though it air dries slowly, kiln drying is also effective, yielding stable timber with minimal surface checking. While some expansion and shrinkage may occur, proper laying techniques for hardwood flooring help maintain stability over time.

Origin and Availability of Sugar Gum Timber

Kosny Timber sources Sugar Gum from sustainable plantations in Australia. Though relatively scarce, Sugar Gum’s versatility, high quality, and sustainable credentials have made it increasingly popular in the timber market, where it is prized for both construction and decorative uses.

 Very LowLowMediumHighVery High
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Tangential :    10.50%
Radial :    6.20%
Unit Movement Tangential:     
Unit Movement Radial:     

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:F17F14F11F8F7
Seasoned:F27F22F17F14F11
Seasoned:

 

1105kg/m3

 

Unseasoned:

 

1190kg/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 brownPink to pink brownLight to dark redBrown, chocolate, mottled or streaky
  
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Modulus of Rupture - Unseasoned:73 MPa
Modulus of Rupture - Seasoned:110 MPa
Modulus of Elasticity - Unseasoned:12.4 GPa
Modulus of Elasticity - Seasoned:16 GPa
Maximum Crushing Strength - Unseasoned:36 MPa
Maximum Crushing Strength - Seasoned:61 MPa
Impact - Unseasoned: 
Impact - Seasoned: 
Toughness - Unseasoned: 
Toughness - Seasoned: 
Hardness - Unseasoned: 
Hardness - Seasoned:10
 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:    
Lyctid Borer Susceptibility:Susceptible
Lyctid Borer Susceptibility - Other: 
Termite Resistance: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