Tallowwood

Brown Timber Species

Species Name: Tallowwood

Botanical name(s): Eucalyptus microcorys

Size and location information: Tallowwood is a large hardwood found along the coast and coastal ranges between the Hunter River in New South Wales up to the Maryborough district of Queensland.

Rough bark persists to the small branches and is brown to red-brown, soft and fibrous.

Description: The heartwood is a greyish-yellow colour with tinges of olive green and is a hard, fairly close-grained timber. The sapwood is distinctly paler. The timber is free of gum vein, something quite rare in eucalypts.

The timber has a slightly ‘greasy’ feel which comes from the high levels of triterpenes among its extracts. This feature can also impact on adhesive bond strength to the material. The problem can be resolved to a certain extent by washing the area(s) to be glued with a 10% solution of sodium hydroxide.

Density: Green: 1200kg/m3, Dry: 100kg/m3

Janka Hardness Rating: Green: 7.6, Dry: 8.6

Shrinkage: 4.5% Radial, 6.0% tangential

Durability: In ground: Class 1 Above ground: Class 1

Lyctids Susceptibility: Yes

Termite Resistance (AS3660): Yes

Strength Group: S2/SD2

Fire Hazard properties:
Ignitability: 12
Spread of flame: 5
Smoke Development: 4

Workability
Reasonably easy to work. Gluing can pre3sent some problems because of the woods greasy nature. It maybe worthwhile to wash the surface with 10% sodium hydroxide before the applying glue. Moderately suitable for steam bending.

Uses:
Decking, flooring, domestic structures, heavy commercial construction, sleepers, marine structures, poles, piles and bridges.

Availability:
Becoming harder.

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