Brush box is a medium to large sized Australian hardwood that grows along the edges of the rainforest areas of New South Wales and Queensland. It is used for a variety of applications including flooring, cladding and bridge decking.
Other Names: Pink Box, Scrub Box, Tristania conferta
Brush box is a medium to large sized Australian hardwood that occurs along the edges of the rainforest areas of the central coast of New South Wales to Bowen in Queensland.
Its heartwood can vary in appearance, from a greyish pink through to a reddish brown, while the sapwood is usually paler in colour. Brush box has a fine and even texture with an interlocking grain – a feature that is appealing for appearance-based applications such as timber flooring, but can cause significant distortion during drying.
Brush box has a poor workability in part due to its density, interlocked grain and the presence of silica. It does however provide good resistance to wear and splintering. The natural waxiness may cause problems with some adhesives but provides a very good base for paints and stains. Brush box is not suitable for steam bending.
Brush box is used for a variety of applications including flooring, cladding, paneling and some structural applications. It is generally available for use in New South Wales and Queensland.
|Very Low||Low||Medium||High||Very High|
|Unit Movement:||0.38 %|
|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:||85|
|Modulus of Rupture - Seasoned:||123|
|Modulus of Elasticity - Unseasoned:||12|
|Modulus of Elasticity - Seasoned:||15|
|Maximum Crushing Strength - Unseasoned:||38|
|Maximum Crushing Strength - Seasoned:||68|
|Impact - Unseasoned:||17|
|Impact - Seasoned:||15|
|Toughness - Unseasoned:||Medium - 15 - 25 Nm|
|Toughness - Seasoned:||Medium - 15 - 25 Nm|
|Hardness - Unseasoned:||7.9|
|Hardness - Seasoned:||9.5|
|(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:||Not 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
|Average Specific Extinction Area:||<250|
|Bushfire Resistance:||BAL 12.5 and 19 – All AS3959 required applications|
|Botanical Name:||Lophostemon confertus|
|Preferred Common Name:||Box, Brush|
|Other Names:||Pink Box, Scrub Box, Tristania conferta|
Brush box has a fine, interlocked grain and even texture with the heartwood ranging from greyish pink through to a reddish brown, while the sapwood is usually paler in colour. It is free of gum veins. The grain is especially appealing for appearance-based applications such as flooring.
Brush box is used for a variety of applications, which consist mainly of flooring, cladding, paneling and some structural applications. Brush box has also been used for mallets, mauls, handles, shuttles, turnery, wharf and bridge decking, carriage building, weatherboarding, boat building and wedges.
Brush box has poor workability in part due to its density, interlocked grain and the presence of silica. Nailing and screwing brush box may cause splitting.
The silica content can cause major problems for tool edges, while the natural waxiness, known as arjunolic acid, may cause problems with some adhesives but provides a very good base for paints and stains.
Box box is not suitable for steam bending. It does however provide good resistance to wear and splintering.
Brush box is limited in availability in its states of origin and rarely available in the other states and territories.
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