Red ironbark is a very distinctive Australian hardwood that has been prized for over 200 years for its strength and durability.
Other Names: Mugga, Ironbark
Red ironbark is a handsome Australian hardwood that grows readily from Victoria through the western slopes of NSW into southern Queensland. As one of a very distinctive group of Australian eucalypts, the ironbarks, it can be easily recognised by its hard, deeply furrowed, rough bark ranging from a dark grey to black hue. It has been a preferred structural timber for over 200 years, due to its long-term performance in weather-exposed structural applications.
Red ironbark heartwood is a deep dark red to red-brown. By contrast, its sapwood is a distinctive pale yellow in colour. The timber's texture is fine and even with an interlocked grain. It is extremely hardwearing and highly durable, allowing for wide range of external applications. However the timber is very hard to work, limiting some applications that require fine detailing. It is slow to dry and care needs to be taken to minimise surface checking.
Red ironbark is ideal for engineered structures that require excellent durability and strength, including wharf and bridge members, poles, railway sleepers, mining timbers. The timber is also suitable for all building construction materials from poles, framing, flooring, decking and cladding. Additionally, the wood is suitable for both indoor and outdoor furniture.
The red ironbark tree has a tendency towards piping, where a hollow forms in the trunk's centre trunk and reduces recovery rates and sectional sizes of sawn timber.
|Very Low||Low||Medium||High||Very High|
|Radial:||3 - 4|
|Unit Movement:||0.37 %|
|Very High||High||Reasonably High||Medium High||Medium||Reasonably Low||Low||Very Low|
|Very High||High||Reasonably High||Medium||Low||Very Low|
|White, yellow, pale straw to light brown||Pink to pink brown||Light to dark red||Brown, chocolate, mottled or streaky|
|Modulus of Rupture - Unseasoned:||116|
|Modulus of Rupture - Seasoned:||118|
|Modulus of Elasticity - Unseasoned:||15|
|Modulus of Elasticity - Seasoned:||16|
|Maximum Crushing Strength - Unseasoned:||59|
|Maximum Crushing Strength - Seasoned:||70|
|Impact - Unseasoned:||18|
|Impact - Seasoned:||13|
|Toughness - Unseasoned:||High - 25 Nm and above|
|Toughness - Seasoned:||Medium - 15 - 25 Nm|
|Hardness - Unseasoned:||12|
|Hardness - Seasoned:||14|
|(0 - 5 yrs)||(5 - 15 yrs)||(15 - 25 yrs)||(more than 25 yrs)|
|(0 - 7 yrs)||(7 - 15 yrs)||(15 - 40 yrs)||(More than 40 yrs)|
|(0 - 20 yrs, usually < 5)||(21 - 40 yrs)||(41 - 64 yrs)||(More than 60 yrs)|
|Marine Borer Resistance:|
|Lyctid Borer Susceptibility:||Susceptible|
|EFH Spread-of-Flame Index:|
|EFH Smoke-Developed Index:|
|Critical Radiance Flux - Lower:||>2.2 and <4.5 kW/m2|
|Critical Radiance Flux - Higher:||<4.5 kW/m2|
|Smoke Development Rate:||<750|
|1 - non-combustible||2 - reasonably non-combustible||3 - slightly combustible||4 - combustible|
|Fire Properties Group
|Group Number - Other:||3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm|
|Average Specific Extinction Area:||<250|
|Bushfire Resistance:||BAL 12.5, 19 and 29 – All AS3959 required applications|
|Botanical Name:||Eucalyptus sideroxylon|
|Preferred Common Name:||Ironbark, Red|
|Other Names:||Mugga, Ironbark|
Red ironbark heartwood is a deep red, contrasting dramatically with its distinctive pale yellow sapwood. It has a fine and even texture with an interlocked grain.
Red ironbark is used for heavy engineering, transport, and marine construction, including poles, piles, sleepers, flooring, decking, bridge work, fencing, carriages and wagons, house framing and sporting goods. It is also useful for domestic and non-domestic decks, joinery, furniture and fit outs and expressed hardwood structures.
Red ironbark is very hard to work, limiting some applications that require fine detailing. It is slow to dry and care needs to be taken to minimise surface checking.
NSW, VIC, QLD
NSW, VIC, SA, TAS, QLD, WA
Red ironbark is readily available in Australia.
Native Forest, Plantation
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