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Walnut, Queensland

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Queensland walnut is a large rainforest tree growing to a height of around 35 metres with a stem diameter of up to 1.8 metres. It is restricted to the coastal tablelands of North Queensland, between Innisfail and Atherton, where it is the dominant rainforest tree species.

The heartwood of the species varies in colour, but is usually greyish-brown with streaks of chocolate brown, black or pink. The sapwood, up to 100 millimetres wide, is pale yellow. Queensland walnut timber exhibits medium texture with a moderate natural lustre and shallow open pores. Grain is close and even, usually interlocked, and commonly wavy. This results in a wide variety of figure effects, especially attractive on quarter-sawn surfaces.

Uses for Queensland walnut are mainly decorative and include plywood, veneers, shop and office fixtures, turnery, and musical instruments - notably guitar backs and sides. Queensland walnut is reported to have higher than usual electrical insulation properties, and may be suitable for some types of electrical enclosure applications.

Timber produced from Queensland walnut has a life expectancy of between five and seven years (for in-ground and above ground applications, respectively). The timber is not termite-resistant, and untreated sapwood is susceptible to borer attack. Sapwood (but not heartwood) is readily impregnated with preservatives. Queensland walnut is recommended for use in continuously dry situations that are under cover, well ventilated, clear of the ground and fully protected from the weather and other dampness.

Commercial availability of Queensland walnut timber is currently very limited, due to World Heritage listing of the main sites in which it occurs.

Appearance

The heartwood of this species is variable in colour, but usually greyish brown with streaks of chocolate brown, black or pink. Sapwood is a pale yellow, and up to 100 millimetres wide. Queensland walnut grain is close and even with occasional waves resulting in a wide variety of figure effects, especially attractive on quarter-sawn surfaces.

Common Applications

Uses for Queensland walnut are mainly decorative and include plywood, furniture, shop and office fixtures, turnery, as well as guitar backs and sides.

Common Form

Veneer

Workability

Queensland walnut is only moderately hard. It lends itself to steam bending and can be worked with hand tools. The timber machines and sands well, but can be abrasive to machine cutters due to its high silica content. No difficulty has been experienced with the use of standard fittings and fastenings. Queensland walnut will readily accept most coatings including paint, stains, polishes and glues. Oiled surfaces are particularly impressive. An unpleasant odour experienced while working Queensland walnut is not detectable in the dry timber.

 

Origin of Timber

QLD

Readily Available

NSW

Availability - Further Information

Queensland Walnut is usually only available as a veneer. Anecdotal evidence suggests that supplies of this timber are becoming scarce.

Availability - Further Information

Native Forest

Shrinkage

Very Low Low Medium High Very High

Tangential :

4.60%

Radial:

2.10%

Unit Movement Tangential:

0.32%

Unit Movement Radial:

0.19%

Strength Group

Very High

High

Reasonably High

Medium High

Medium

Reasonably Low

Low

Very Low

Unseasoned:

S1

S2

S3

S4

S5

S6

S7

Seasoned:

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

Stress Grade

Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5

Unseasoned:

F11

F8

F7

F5

F4

Seasoned:

F17

F14

F11

F8

F7

Density per Standard

Seasoned:

680kg/m3

Unseasoned:

900kg/m3

Joint Group

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

J5

J6

Seasoned:

JD1

JD2

JD3

JD4

JD5

JD6

Colour

  White, yellow, pale straw to light brown Pink to pink brown Light to dark red Brown, chocolate, mottled or streaky
   

Mechanical Properties

Modulus of Rupture - Unseasoned:

Modulus of Rupture - Seasoned:

Modulus of Elasticity - Unseasoned:

Modulus of Elasticity - Seasoned:

Maximum Crushing Strength - Unseasoned:

Maximum Crushing Strength - Seasoned:

Impact - Unseasoned:

Impact - Seasoned:

Toughness - Unseasoned:

Toughness - Seasoned:

Hardness - Unseasoned:

Hardness - Seasoned:

Durability

Low Moderate Reasonably High High
(0 - 5 yrs) (5 - 15 yrs) (15 - 25 yrs) (more than 25 yrs)

In-Ground:

(0 - 7 yrs) (7 - 15 yrs) (15 - 40 yrs) (More than 40 yrs)

Above ground:

(0 - 20 yrs, usually < 5) (21 - 40 yrs) (41 - 64 yrs) (More than 60 yrs)

Marine Borer Resistance:

Lyctid Borer Susceptibility:

Susceptible

Lyctid Borer Susceptibility - Other:

Termite Resistance:

Not Resistant

Fire Properties

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

EFH Ignitibility:

0 1 2 3 4 5 6 7 8 9 10

EFH Spread-of-Flame Index:

EFH Smoke-Developed Index:

1 - non-combustible 2 - reasonably non-combustible 3 - slightly combustible 4 - combustible

Fire Properties Group
Number:

Group Number - Other:

3 if used on MDF or particleboard ≥12mm; veneer thickness 0.6-0.85mm

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – Door and window joinery only

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