Ironbark Timber Technical Information
Red Ironbark (Eucalyptus sideroxylon)
Red Ironbark is extremely hard. Its colour varies from pale to rich reds as well as browns. The grain is usually interlocked, with a moderately coarse texture. It is extremely hardwearing and highly durable, allowing for wide range of external applications. However the timber is very hard to work, limiting some applications that require fine detailing. Red Ironbark is ideal for engineered structures that require excellent durability and strength, including wharf and bridge members, poles, railway sleepers, mining timbers. The timber is also suitable for all building construction materials from poles, framing, flooring, decking and cladding.
Physical Properties
- Dry Density: 1090 kg/m³
- Janka Dry Hardness: 13 kN
The Janka rating is the hardness level given to each species. The higher the number, the greater the hardness.
The natural colour variation within a timber species is normal and one of its most appealing attributes.
| Colour Range | Red | |
| Janka (Hardness) Rating – Dry | 13 | |
| Natural Durability Class | In-ground contact | 1 |
| Outside above ground contact | 1 | |
| Density (kg/m3) | Unseasoned (Green) | 1220 |
| Seasoned (Dry) | 1090 | |
| Strength Group | Unseasoned (Green) | S2 |
| Seasoned (Dry) | SD2 | |
| Joint Group | Unseasoned (Green) | J1 |
| Seasoned (Dry) | JD1 | |
| Fire Indices | Spread-of-Flame Index | 5 |
| Fire Rating | BAL29 | |
| Smoke-Developed Index | 5 | |
| Critical Radiant Flux | >2.2 and <4.5 | |
| Smoke Development Rate | <750 | |
| Group Number | 3 | |
| Naturally bushfire-resisting Timber | Yes | |
| Tangential Shrinkage % | 6.3 | |
| Toughness (Nm) | Naturally Unseasoned (Green) | 17 |
| Seasoned (Dried) | 14 | |
| Naturally Termite Resistant to AS3660R = Resistant
NR = Non resistant |
R | |
| Naturally Lyctus SusceptibleS = Susceptible
NS = Non susceptible |
S |