Appearance
Silvertop ash has a narrow sapwood, which is not clearly distinguishable from the heartwood. Its heartwood is brown and sometimes pinkish in colour and often features the grain interlocked with growth rings.
With a medium texture, silvertop ash is also recognisable by the common occurrence of gum veins, the markings of pinhole borers and pencil streaks.
Common Applications
Silvertop ash is mainly used as a building timber, such as in timber framing, cladding and decking, It is often used for building framework on the south coast and tablelands of NSW. It is strong and reasonably durable, plus it has also been found to provide good fire resistance.
Other common applications include flooring, furniture and high-end joinery. Silvertop ash is also used for vehicle construction, handles, fence posts, amongst many other uses.
COMMON NAME
Silvertop Ash
LOOK & FEATURES
Moderately coarse & even texture, heavy, hard & compact
BOTANICAL NAME
Eucalyptus sieberi
COLOUR
White, yellow, pale straw to light brown.
COMMON USES
Cladding, flooring, decking, fencing.
Shrinkage | |
---|---|
Tangential | 10.60% |
Radial | 5.70% |
Unit Movement Tangential | 0.36% |
Unit Movement Radial | 0.25% |
Strength Group | |
---|---|
Unseasoned | S3 |
Seasoned | SD3 |
Stress Grade | |
---|---|
Unseasoned | F7/f8/F11/F14/F17 |
Seasoned | F11/F14/F17/F22/F27 |
Density per Standard | |
---|---|
Unseasoned | 850kg/m3 |
Seasoned | 1100kg/m3 |
Joint Group | |
---|---|
Unseasoned | J2 |
Seasoned | JD2 |
Mechanical Properties | |
---|---|
Modulus of Rupture - Unseasoned | 78 |
Modulus of Rupture - Seasoned | 137 |
Modulus of Elasticity - Unseasoned | 13.2 |
Modulus of Elasticity - Seasoned | 17.3 |
Maximum Crushing Strength - Unseasoned | 41,6 |
Maximum Crushing Strength - Seasoned | 75 |
Impact - Unseasoned | 19.5 |
Impact - Seasoned | 20.3 |
Toughness - Unseasoned | Medium - 15 - 24 Nm |
Toughness - Seasoned | Medium - 15 - 24 Nm |
Hardness - Unseasoned | 6.7 |
Hardness - Seasoned | 9.7 |
Durability | |
---|---|
In-Ground | (5 - 15 yrs) |
Above ground | (15 - 40 yrs) |
Marine Borer Resistance | (0 - 20 yrs, usually < 5) |
Lyctid Borer Susceptibility | Not Susceptible |
Termite Resistance | Not Resistant |
Fire Properties | |
---|---|
EFH Spread-of-Flame Index | 6 |
EFH Smoke-Developed Index | 3 |
Critical Radiance Flux - Lower | >2.2 and <4.5 |
Critical Radiance Flux - Higher | >2.2 and <4.5 |
Smoke Development Rate | <750 |
Average Specific Extinction Area | <250 |
Bushfire Resistance | Bushfire Attack Level (BAL) 12.5, 19 and 29 - All AS 3959 Required Applications |