Red Ironbark. Hardwood Species Specification Data

Timber Species: Red Ironbark (Eucalyptus sideroxylon)

Red Ironbark: Hardwood Timber SpeciesNearly as tough and resilient as its close cousin the grey ironbark, red ironbark trees are an evergreen eucalyptus that grows to approximately 30 meters tall. Often called a mugga, mugga ironbark, or pink ironbark, the tree is especially hardy and can grow in some of the most desolate types of sandy soils.

Situated sporadically but widely in the eastern and southern regions of Australia and most commonly found in north-central Victoria, the western plains and slopes of New South Wales. and southeast Queensland, red ironbark trees have deeply furrowed bark so dark as to be almost black, though its upper limbs are smooth and appear closer to white in color. Thanks to its black bark, any red kino – or plant gum – that appears on it contrasts sharply and makes it quite conspicuous.

With a density of 1090 kg/m³ and a Janka dry hardness score of an impressively high 13, red ironbark is nearly identical to its grey cousin while being slightly easier to work with – and providing different ranges of color and hue. In fact, part of red ironwood’s charm is its variegated hues, especially when placed adjacent to one another in flooring products. Despite these slight differences, red ironbark is incredibly resistant to termites as well, making it not just a handsome material but a highly durable one.

Despite these slight differences between it and other ironbark varietals, red ironbark is incredibly resistant to termites, making it not just a handsome material but a highly durable one. Most commonly pale to rich red – hence its name – this timber can also skew into the brown colorations, with a moderately coarse but interlocking grain.  As a result, red ironbark is most suited for solid timber flooring, especially thanks to its dark, rich rosy color and its extreme durability.

Physical Properties

Dry Density:  1090 kg/m³

Janka Hardness: 13 kN

These properties are only a guide, as timber is a natural product there will be variations within any species. The Janka Dry Hardness rating measures the hardness of the wood. The higher the number the harder the wood.

 Technical Properties of Red Irobark

Species Name

Red Ironbark

Botanical Name

Botanical Name

Eucalyptus sideroxylon

Colour Range


Janka Hardness

Janka (Hardness) Rating - Dry


Natural Durability
Natural Durability Class

In-ground contact
Outside above ground contact



Timber Density
Density (kg/m3)

Unseasoned (Green)
Seasoned (Dry)


Strength Group

Strength Group

Unseasoned (Green)
Seasoned (Dry)


Joint Group
Joint Group

Unseasoned (Green)
Seasoned (Dry)


Fire Indices
Fire Indices

Spread-of-Flame Index
Smoke-Developed Index
Critical Radiant Flux
Smoke Development Rate
Group Number
Naturally bushfire-resisting Timber

>2.2 and <4.5

Tangential Shrikage
Tangential Shrinkage %


Timber Toughness

Toughness (Nm)

Naturally Unseasoned(Green)
Seasoned (Dried)




Termite Resistant

Naturally Termite Resistant to AS3660

R = Resistant
NR = Non resistant


Lyctu Susceptible

Naturally Lyctus Susceptible

S = Susceptible
NS = Non susceptible


 Australian Hardwood Timber Species | Red Mahogany