Brush Box

Brush Box is a medium to large sized Australian hardwood that occurs along the edges of the rain forest 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 work-ability 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.

Botanical name
Lophostemon confertus
Origin
Brush Box grows on the edge of the rainforests from the central coastal of New South Wales to Bowen in Queensland.
Trading names
Brush Box
Appearance
Heartwoodvaries from a pinkish grey to a rich reddish brown.
Sapwoodusually distinctively paler.
Texturefine and even.
Grainusually interlocked to varying degrees.
Growth ringsnot easily distinguished.
The general appearance of the redder types of brush box can be rather similar to that of Turpentine.
General comment
Material with considerably interlocked grain can distort severely in drying.

Provided the grain is relatively straight it has good resistance to surface checking.

Not easy to work.

Not suitable for steam bending.

It is very resistant to wear and has good resistance to splintering.

High silica content.

Its natural waxiness occasionally causes some adhesion problems with some highly solvent floor finishes but it is a very good base for paints and stains.

Low in tannins and is much less inclined to stain than the eucalyptus when leached by rain.

Common uses

Bridge decking (in dry areas), paneling, cladding, and flooring.
Properties
(See notes below)
Hardness rating
Average Hardness Rating - Dry: Hard

Lyctid Susceptibility of Sapwood
Not susceptible
(source AS 5604)

Termite Resistance of Heartwood (inside above ground)
Resistant
(source AS 5604)

Marine Borer Resistance of Heartwood
Class 2
(source AS 5604)

Natural Durability Rating of Heartwood Above Ground
Class 3
(source AS 5604)

Natural Durability Rating of Heartwood In-Ground Contact
Class 3
(source AS 5604)
Notes

Density: 'Green Density' (GD) is the density of the wood at the time the living tree is felled. It varies considerably with the season, weather conditions, the age of the tree and so on; the quoted figure must therefore be accepted as a guideline only and when accurate green density figures are required for, say, assessment of transport costs, it is advisable to carry out accurate determinations on the materials involved.

'Dry Density' or 'Air Dry Density' (ADD) is the average density of the wood at 12 per cent moisture content. It too varies with conditions of growth, climate and maturity of wood.

There are published figures for both Green Density and Air Dry Density of most commercial species.

The figures given above have been rounded to the nearest 50.

Hardness rating: The hardness rating of a timber species is measured by the Janka Test. This is a standard test which measures the penetration into the timber of a common load and projectile. The results relate to a hardness capacity of the material and are expressed in kN. This information is useful where the timber may be subject to potential damage from impacts e.g. a dance floor. There are 2 sets of published figures; one for 'Green' or freshly felled timber and one for seasoned timber - i.e. timber with a moisture content of 12%.

The ratings given here are:
Soft - less than 5.5
Moderate - 5.5 to 7.0
Hard - 7.1 to 10.0
Very Hard - greater than 10.0.

Lyctid susceptible sapwood: Only the sapwood of some hardwoods is susceptible to lyctid borer attack. No softwoods are susceptible to attack.

Natural durability ratings: The natural durability rating of a timber species is a rating of the timber's resistance to attack by wood destroying fungi and wood destroying insects. The sapwood of all timber species has poor resistance and so the natural durability rating applies only to the heartwood of a timber species. The rating is based on the testing of stakes and poles embedded in the ground and on expert opinion of historical performance. There are 2 sets of ratings: one for above ground use and one for in-ground contact use. The lower the number the higher the performance in terms of durability. This information is useful for specifying material for external or exposed applications.

 

English Oak
Sydney Blue Gum

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