Appearance
Silvertop Ash features a medium texture with an interlocked grain, highlighted by its distinctive growth rings. Its heartwood ranges from brown to a soft pinkish hue, while the narrow sapwood may not always be easily distinguishable. Characterized by the presence of gum veins, pinhole borer markings, and subtle pencil streaks, Silvertop Ash showcases a unique visual appeal that adds warmth and character to any project.
Common Applications
Silvertop Ash is valued as a versatile building timber, particularly suited for timber framing and structural applications along the NSW south coast and tablelands. Its natural durability and fire-resistant properties make it one of the seven hardwoods approved by the Building Commission in Victoria for use in bushfire-prone areas, provided it has a thickness of over 18mm. Beyond construction, Silvertop Ash is commonly used in flooring, furniture, high-end joinery, vehicle construction, fence posts, and handles. Additionally, it is utilized in packaging and chemical pulp manufacturing.
Workability
Silvertop Ash offers reasonable workability and is compatible with most woodworking tools. It machines well, is easy to nail and screw, and accepts a wide range of coatings. Though prone to splintering, it sands smoothly and is excellent for steam bending. Historically, the wood’s splitability made it a favorite among pioneers for roof shakes, as it easily splits along the rays. However, care should be taken when drying Silvertop Ash, as it is prone to surface checking on the tangential surface and dries at a slower rate.
Origin and Availability
Kosny Timber sources Silvertop Ash from sustainably managed native forests across New South Wales, Victoria, and Tasmania. Readily available throughout Australia, this timber provides both strength and resilience, ideal for projects requiring a moderately durable hardwood with a unique visual appeal.
Very Low | Low | Medium | High | Very High | |
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Tangential : | 10.60% | ||||
Radial : | 5.70% | ||||
Unit Movement Tangential: | 0.36% | ||||
Unit Movement Radial: | 0.25% |
Very High | High | Reasonably High | Medium High | Medium | Reasonably Low | Low | Very Low | |
Unseasoned: | S1 | S2 | S3 | S4 | S5 | S6 | S7 | S8 |
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Seasoned: | SD1 | SD2 | SD3 | SD4 | SD5 | SD6 | SD7 | SD8 |
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Structural No. 1 | Structural No. 2 | Structural No. 3 | Structural No. 4 | Structural No. 5 | |
Unseasoned: | F17 | F14 | F11 | F8 | F7 |
Seasoned: | F27 | F22 | F17 | F14 | F11 |
Seasoned: |
850kg/m3
|
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Unseasoned: |
1100kg/m3
|
Very High | High | Reasonably High | Medium | Low | Very Low | |
Unseasoned: | J1 | J2 | J3 | J4 | J5 | J6 |
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Seasoned: | JD1 | JD2 | JD3 | JD4 | JD5 | JD6 |
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White, yellow, pale straw to light brown | Pink to pink brown | Light to dark red | Brown, chocolate, mottled or streaky | |
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Modulus of Rupture - Unseasoned: | 78 MPa |
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Modulus of Rupture - Seasoned: | 137 MPa |
Modulus of Elasticity - Unseasoned: | 13.2 GPa |
Modulus of Elasticity - Seasoned: | 17.3 GPa |
Maximum Crushing Strength - Unseasoned: | 41.6 MPa |
Maximum Crushing Strength - Seasoned: | 75 MPa |
Impact - Unseasoned: | 19.5 J |
Impact - Seasoned: | 20.3 J |
Toughness - Unseasoned: | Medium - 15 - 24 Nm |
Toughness - Seasoned: | Medium - 15 - 24 Nm |
Hardness - Unseasoned: | 6.7 |
Hardness - Seasoned: | 9.7 |
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: | Not Susceptible |
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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: |
Critical Radiance Flux - Lower: | >2.2 and <4.5 |
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Critical Radiance Flux - Higher: | >2.2 and <4.5 |
Smoke Development Rate: | <750 |
1 - non-combustible | 2 - reasonably non-combustible | 3 - slightly combustible | 4 - combustible | |
Fire Properties Group |
Average Specific Extinction Area: | <250 |
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Bushfire Resistance: | Bushfire Attack Level (BAL) 12.5, 19 and 29 - All AS 3959 Required Applications |