Wattle, Silver | Acacia dealbata

Silver wattle is a timber of choice for furniture designers because of its attractive figure and ready workability. It affords a striking visual contrast to blackwood, a closely related species.

Overview

Silver wattle occurs throughout eucalypt forests and woodlands in New South Wales, Victoria and Tasmania. It is a fast-growing species that can reach heights of around 30 metres and a stem diameter of up to 75 centimetres. Because silver wattle has a relatively short lifespan and regenerates well after fire, supplies are usually readily available from stands of regrowth harvested on rotation.

This species yields a striking light brown to subtle pink timber with a straight grain and porous even texture. Silver wattle’s distinctive growth rings create an appealing and attractive figure; a striped pattern often results on back-sawn surfaces. It is a timber of choice among furniture designers and manufacturers, by whom it is often used in decorative counterpoint to blackwood, a closely related more common and much darker hardwood timber.

Silver wattle is easy to work with both machine and hand tools. It may be turned, bored, sawed and planed with excellent results. Pre-drilling is recommended when nailing, in order to prevent splitting. Silver wattle is an excellent bending timber. It glues satisfactorily with most common adhesives, accepts most finishes readily, and may be polished to a smooth, lustrous surface.

Silver wattle is not recommended for external applications, but is sufficiently durable for most internal applications including decorative, architectural and structural use. The untreated sapwood of this species is susceptible to lyctid borer attack. 

 

Properties

Shrinkage

Very Low Low Medium High Very High
Tangential:          
0.0
Radial: 0 - 2

Strength Group

Very High High Reasonably High Medium High Medium Reasonably Low Low Very Low
Unseasoned:S1S2S3S4S5S6S7
Seasoned:SD1SD2SD3SD4SD5SD6SD7SD8

Stress Grade

Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5
Unseasoned: F14 F11 F8 F7 F5
Seasoned: F17 F14 F11 F8 F7

Density per Standard

Unseasoned: 800 kg/m3
Seasoned: 680 kg/m3

Joint Group

Very High High Reasonably High Medium Low Very Low
Unseasoned:J1J2J3J4J5J6
Seasoned:JD1JD2JD3JD4JD5JD6

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: 60
Modulus of Rupture - Seasoned: 87
Modulus of Elasticity - Unseasoned: 10
Modulus of Elasticity - Seasoned: 12
Maximum Crushing Strength - Unseasoned: 30
Maximum Crushing Strength - Seasoned: 52
Impact - Unseasoned: 14
Impact - Seasoned: 19
Hardness - Unseasoned: 4.0
Hardness - Seasoned: 5.1

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:

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:
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
Number:
Average Specific Extinction Area: <250
Bushfire Resistance: BAL 12.5 and 19 – All AS3959 required applications

Description

Botanical Name: Acacia dealbata
Preferred Common Name: Wattle, Silver
Species Type: Hardwood

Appearance

Silver wattle is a striking light brown to subtle pink timber with a straight grain and porous even texture. Silver wattle’s distinctive growth rings create an appealing and attractive figure, especially on backsawn surfaces, where a striped pattern often ensues.

Common Applications

Silver wattle is a timber of choice for furniture designers and manufacturers. It is often used in counterpoint to blackwood, a closely related but much darker hardwood species. It is suitable for most internal applications, including structural, architectural and decorative.

Common Form

Sawn, Veneer

Workability

Silver wattle is easy to work with both machine and hand tools. It may be turned, bored, sawed and planed with excellent results. Pre-drilling is recommended when nailing, in order to prevent splitting. Silver wattle is also an excellent bending timber. It glues satisfactorily with most common adhesives, accepts most finishes readily and may be polished to a smooth, lustrous surface.

 

Origin of Timber

NSW, VIC, TAS

Readily Available

NSW, VIC, TAS

Availability - Further Information

Silver wattle occurs throughout eucalypt forests and woodlands in New South Wales, Victoria and Tasmania. It is a fast-growing species that can reach heights of around 30 metres, and a stem diameter of up to 75 centimetres. Because silver wattle has a relatively short lifespan and regenerates well after fire, supplies are usually readily available from stands of regrowth harvested on rotation.

Source of Timber

Native Forest

Applications

Case Studies

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