Collection: Grey Ironbark Timber

Grey Ironbark (Eucalyptus drepanophylla and Eucalyptus paniculata) is a premium Australian hardwood, prized for its unmatched strength, durability, and versatility. This timber has been a staple throughout Australian history, from its use by Indigenous Australians for tools and medicinal purposes to its widespread modern applications in construction and engineering. Known for its resistance to termites and lyctid borers, Grey Ironbark is ideal for demanding structural and decorative uses, where longevity and resilience are paramount.

Appearance of Grey Ironbark Timber

The timber of Grey Ironbark is distinctively beautiful, with heartwood ranging from light grey or chocolate brown to darker reddish hues, sometimes accented by black streaks. The sapwood contrasts sharply, being almost white and typically around 20mm thick. The grain is generally tight and straight, though occasional interlocking adds subtle character, and the texture is moderately coarse and even. Regional variations in color and streaking further enhance its appeal for those seeking unique and robust timber.

Applications of Grey Ironbark Timber

Grey Ironbark’s reputation for strength and durability makes it a versatile material for both structural and aesthetic purposes. In engineering, it is used for wharf and bridge construction, railway sleepers, cross-arms, poles, piles, and mining timbers. The timber’s robustness also lends itself to general construction, including house framing with unseasoned timber, and cladding, flooring, linings, and joinery when seasoned and dressed. Beyond construction, Grey Ironbark has historical significance in boatbuilding, where it has been utilized for keels, frames, and planking, even in icebreaker ships. It is also popular in landscaping for fencing and retaining walls, as well as in crafting agricultural machinery, mallet heads, and sporting goods like croquet mallets and bowling pins.

Workability of Grey Ironbark Timber

While Grey Ironbark is exceptionally durable, its density of 1120 kg/m³ makes it a challenging timber to work with. It is slow to dry and requires careful handling during processing to avoid surface checking. Despite its density, the timber can be machined effectively with the right tools, producing dressed surfaces with a characteristic steely sheen. It is well-suited for sanding and polishing, which brings out its rich colors and texture, making it an excellent choice for decorative applications like outdoor furniture and fine joinery.

Durability of Grey Ironbark Timber

Grey Ironbark is classified as a Class 1 timber for both in-ground and above-ground applications, offering exceptional resistance to decay, termites, and borers. Its long lifespan, exceeding 40 years in most structural uses, makes it a reliable and sustainable choice for even the most demanding environments.

Origin and Availability of Grey Ironbark Timber

Native to the coastal regions of New South Wales and southern Queensland, Grey Ironbark is widely regarded as one of Australia’s finest hardwoods. While commonly available in large sizes for structural use, it can also be supplied in custom sizes for a range of applications. The commercial prevalence of Eucalyptus paniculata ensures that Grey Ironbark remains a dependable option for both traditional and modern projects.

 Very LowLowMediumHighVery High
    Check markCheck mark
Tangential :    7.50%
Radial :    4.70%
Unit Movement Tangential:   0.39% 
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

Check mark
 Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5
Unseasoned:F22F22F17F14F11
Seasoned:F34F34F27F22F17

Seasoned:

1106kg/m3

Unseasoned:

1170kg/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
  
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Modulus of Rupture - Unseasoned:121 MPa
Modulus of Rupture - Seasoned:185 MPa
Modulus of Elasticity - Unseasoned:19 GPa
Modulus of Elasticity - Seasoned:23 GPa
Maximum Crushing Strength - Unseasoned:63 MPa
Maximum Crushing Strength - Seasoned:97 MPa
Impact - Unseasoned:27 J
Impact - Seasoned:25 J
Toughness - Unseasoned:Medium - 15 - 24 Nm
Toughness - Seasoned:Medium - 15 - 24 Nm
Hardness - Unseasoned:11
Hardness - Seasoned:16
 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:Not Susceptible
Lyctid Borer Susceptibility - Other: 
Termite Resistance:Resistant
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EFH Spread-of-Flame Index:         
EFH Smoke-Developed Index:         

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