Timber Species: Blackbutt - Eucalyptus Pilularis

Description:

Native to Southeastern Australia, Blackbutt (from an economic standpoint) is a Eucalyptus varietal that’s one of our country’s most important hardwoods. Used not just as a food source for koala bears but for the high quality of timber it produces, its ease of regeneration, and its relatively quick growth.

Hardwood Species: BlackbuttBlackbutt grows as tall as 50 meters, with an impressive average trunk diameter of 4.1 meters. Glossy to dark green leaves adorn these giants, and it features lovely white flowers from September to March.

Its bark is unique, rough from the ground to about halfway up, where it then gives away to smooth white bark instead. The charming common name of this tree comes from its appearance after fires, with the base appearing black. Mature heartwood tends to be pale yellow with brown notes, while sapwood is often much more pale in comparison.

With coloring from pale brown to cream, and with a cathedral grain pattern that’s been called “inspiring” by builders and interior designers alike, blackbutt has a moderately coarse yet even texture thanks to its interlocking but overall straight grain. A Janka hardness rating of 6.3 and a pH of around 3.4 makes it relatively durable and acidic. Dry density for blackbutt is approximately 900 kg/m³, making it an overall good choice for hardwood flooring.

A highly versatile timber, blackbutt is a fantastic choice for not just solid timber floors but also engineered wood, parquetry, and decking.

As always, please remember that all types wood, being a natural product, feature massive amounts of variation when it comes to appearance, density, and hardness. In fact, don’t be surprised if your blackbutt contains hints of pink hues, one of the most common color variations for this handsome and versatile Australian hardwood.

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Physical Properties

Dry Density:  900 kg/m³

Janka Hardness: 9.1 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.

Australian Hardwood Timber Species | Brushbox

 

Technical Properties of Blackbutt

Species Name

Blackbutt

Botanical Name

 Eucalyptus pilularis

Colour Range

Blonde

Janka (Hardness) Rating – Dry

9.1


Natural Durability Class

In-ground contact
Outside above ground contact

2
1

Density (kg/m3)

Unseasoned (Green)
Seasoned (Dry)
1100
880

Strength Group

Unseasoned (Green)
Seasoned (Dry)
S2
SD2

Joint Group

Unseasoned (Green)
Seasoned (Dry)
J2
JD2

Fire Indices

Spread-of-Flame Index
Smoke-Developed Index
Critical Radiant Flux
Smoke Development Rate
Group Number
Naturally bushfire-resisting Timber
9
3
>2.2 and <4.5
<750
3
YES

Tangential Shrinkage %

7.3

Toughness (Nm)

Naturally Unseasoned(Green)
Seasoned (Dried)
21
22

Naturally Termite Resistant to AS3660

R = Resistant
NR = Non resistant
RESISTANT

Naturally Lyctus Susceptible

S = Susceptible
NS = Non susceptible
NON SUSCEPTIBLE
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