Collection: Grey Box

Grey Box is a tough, highly durable Australian hardwood found across the central and northern coastal regions of New South Wales and southern Queensland, with additional growth areas in Victoria and South Australia. Known for its strength and density, Grey Box (Eucalyptus woollsiana) is ideal for demanding structural and construction applications, offering both resilience and aesthetic appeal.

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Appearance of Grey Box Timber

Grey Box heartwood is a pale, yellowish-brown color, with lighter sapwood. It has a fine, even texture with a characteristic interlocked grain, rarely featuring gum veins. Its appearance is similar to that of Coast Grey Box, making it an attractive option for both practical and decorative applications.

Common Applications of Grey Box Timber

Due to its density and durability, Grey Box is commonly used in heavy construction, flooring, and round timber applications. It’s also highly valued for cladding, bridge and wharf construction, shipbuilding, piles, poles, and sleepers. Additionally, Grey Box is an excellent fuelwood, known for its high energy content.

Workability of Grey Box Timber

Though Grey Box’s density provides outstanding durability, it can be challenging to work with. The timber can be painted, stained, and polished to a fine finish, but machining and surface preparation should occur immediately prior to gluing to ensure optimal adhesion. While it dries slowly, Grey Box is resistant to surface checking, making it stable for long-term projects.

Origin and Availability of Grey Box Timber

Kosny Timber sources Grey Box from sustainably managed native forests in New South Wales and Queensland, with limited availability in Victoria and South Australia. The timber is primarily available in the regions where it grows, with strong demand for its use in flooring and construction.

 Very LowLowMediumHighVery High
   Check markCheck markCheck mark
Tangential :    7.40%
Radial :   3.30% 
Unit Movement Tangential:    0.43%
Unit Movement Radial:  0.23%  

Very High

High

Reasonably High

Medium High

Medium

Reasonably Low

Low

Very Low

Unseasoned:

S1

S2

S3

S4

S5

S6

S7

S8

Check mark

Seasoned:

SD1

SD2

SD3

SD4

SD5

SD6

SD7

SD8

Check mark
 Structural
No. 1
Structural
No. 2
Structural
No. 3
Structural
No. 4
Structural
No. 5
Unseasoned:F27F17F14F11F8
Seasoned:F34F27F22F17F14
Seasoned:

 

1105kg/m3

 

Unseasoned:

 

1230kg/m3

 

Very High

High

Reasonably High

Medium

Low

Very Low

Unseasoned:

J1

J2

J3

J4

J5

J6

Check mark

Seasoned:

JD1

JD2

JD3

JD4

JD5

JD6

Check mark
 White, yellow, pale straw to light brownPink to pink brownLight to dark redBrown, chocolate, mottled or streaky
  
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Modulus of Rupture - Unseasoned:98 MPa
Modulus of Rupture - Seasoned:143 MPa
Modulus of Elasticity - Unseasoned:13 GPa
Modulus of Elasticity - Seasoned:16 GPa
Maximum Crushing Strength - Unseasoned:50 MPa
Maximum Crushing Strength - Seasoned:78 MPa
Impact - Unseasoned:19 J
Impact - Seasoned:15 J
Toughness - Unseasoned: 
Toughness - Seasoned: 
Hardness - Unseasoned:11
Hardness - Seasoned:15
 LowModerateReasonably HighHigh
 (0 - 5 yrs)(5 - 15 yrs)(15 - 25 yrs)(more than 25 yrs)
In-Ground:   Check mark
 (0 - 7 yrs)(7 - 15 yrs)(15 - 40 yrs)(More than 40 yrs)
Above ground:   Check mark
 (0 - 20 yrs, usually < 5)(21 - 40 yrs)(41 - 64 yrs)(More than 60 yrs)
Marine Borer Resistance:  Check mark 
Lyctid Borer Susceptibility:Susceptible
Lyctid Borer Susceptibility - Other: 
Termite Resistance:Resistant

Critical Radiance Flux - Lower:

>2.2 and <4.5

Critical Radiance Flux - Higher:

≥4.5

Smoke Development Rate:

<750

Average Specific Extinction Area:

<250

Bushfire Resistance:

BAL 12.5 and 19 – All AS3959 required applications