Appearance of Mountain Grey Gum Timber
The wood of Mountain Grey Gum is pale brown, often enhanced by subtle pink or yellow tinges. While sapwood is generally lighter, it is not always visually distinct from the heartwood. The grain is typically straight and close, with occasional interlocking, and the texture is moderately coarse and even. Common gum veins add character to this timber, especially in decorative applications.
Common Applications of Mountain Grey Gum Timber
Mountain Grey Gum is versatile in its applications, used in general construction, including building frameworks, bridge and wharf construction, sleepers, and wheelwright work. It is also suitable for paneling and flooring. With careful selection, free from excessive gum veins, this timber is a valuable option for furniture, joinery, and veneers.
Workability of Mountain Grey Gum Timber
Mountain Grey Gum is reasonably easy to work with both hand and machine tools. Its hardness allows for smooth machining, though care should be taken with finishing procedures in pieces with heavy gum veins. The timber is straightforward to machine and can be finished with care for attractive decorative applications.
Origin and Availability of Mountain Grey Gum Timber
Kosny Timber sources Mountain Grey Gum from native forests in southern New South Wales and parts of Victoria. While availability is generally limited outside these regions, Mountain Grey Gum remains a sought-after choice for construction and decorative projects requiring moderate durability.
| Very Low | Low | Medium | High | Very High | |
|---|---|---|---|---|---|
 | | ||||
| Tangential : | 11.90% | ||||
| Radial : | 5.30% | ||||
| Unit Movement Tangential: | 0.39% | ||||
| Unit Movement Radial: | 0.27% |
Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
Unseasoned: | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
|---|---|---|---|---|---|---|---|---|
| ||||||||
Seasoned: | SD1 | SD2 | SD3 | SD4 | SD5 | SD6 | SD7 | SD8 |
|
| Structural No. 1 | Structural No. 2 | Structural No. 3 | Structural No. 4 | Structural No. 5 | |
| Unseasoned: | F17 | F14 | F11 | F8 | F7 |
| Seasoned: | F34 | F27 | F22 | F17 | F14 |
Seasoned: | 870kg/m3 |
|---|---|
Unseasoned: | 1050kg/m3 |
Very High | High | Reasonably High | Medium | Low | Very Low | |
Unseasoned: | J1 | J2 | J3 | J4 | J5 | J6 |
|---|---|---|---|---|---|---|
| ||||||
Seasoned: | JD1 | JD2 | JD3 | JD4 | JD5 | JD6 |
|
| White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
| ||||
| Modulus of Rupture - Unseasoned: | 75 MPa |
|---|---|
| Modulus of Rupture - Seasoned: | 141 MPa |
| Modulus of Elasticity - Unseasoned: | 14 GPa |
| Modulus of Elasticity - Seasoned: | 18 GPa |
| Maximum Crushing Strength - Unseasoned: | 39 MPa |
| Maximum Crushing Strength - Seasoned: | 76 MPa |
| Impact - Unseasoned: | 17 J |
| Impact - Seasoned: | 18 J |
| Toughness - Unseasoned: | Medium - 15 - 24 Nm |
| Toughness - Seasoned: | Medium - 15 - 24 Nm |
| Hardness - Unseasoned: | 7.0 |
| Hardness - Seasoned: | 10 |
| 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 |
| 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 |
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 – All AS3959 required applications |