Appearance of Balau Timber
Balau’s heartwood displays a rich yellow to brown tone, contrasting with its paler sapwood, which may be up to 50mm wide. With a moderately fine, even texture and interlocked grain, Balau produces a striking stripe figure on the radial surface. Resin pockets are common, and the wood is susceptible to minor pinhole borer damage, giving it a distinctive character that suits various aesthetic and functional uses.
Common Applications of Balau Timber
Balau’s high density and durability make it ideal for heavy construction projects. It is frequently used for wharfage, railway sleepers, and shipbuilding, where its strength is required. Its toughness makes it a reliable choice for other structural applications where stability and longevity are crucial.
Workability of Balau Timber
Despite its density, Balau is relatively easy to work with. The wood is free of silica, making it kinder to cutting equipment; however, resin pockets can lead to resin build-up on tools, requiring regular cleaning. When nailing, pre-drilling is recommended to avoid splitting. Balau can be painted, stained, and polished, providing flexibility in finishes, though it is unsuitable for steam bending. Machining and surface preparation should be done immediately prior to gluing to achieve the best results.
Origin and Availability of Balau Timber
Sourced from native forests in Southeast Asia, Balau is seldom seen in Australia but is highly regarded in specialized construction for its durability. This unique hardwood offers a distinctive aesthetic and reliable performance for heavy-duty projects.
Very Low | Low | Medium | High | Very High | |
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Unit Movement Tangential: | |||||
Unit Movement Radial: | |||||
Tangential : | 7.30% | ||||
Radial : | 4.50% |
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: | F27 | F17 | F14 | F11 | F8 |
Seasoned: | F27 | F22 | F17 | F14 | F11 |
Seasoned: |
900kg/m3
|
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Unseasoned: |
1150kg/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: | 103 |
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Modulus of Rupture - Seasoned: | |
Modulus of Elasticity - Unseasoned: | 18.3 GPa |
Modulus of Elasticity - Seasoned: | |
Maximum Crushing Strength - Unseasoned: | 66 MPa |
Maximum Crushing Strength - Seasoned: | |
Impact - Unseasoned: | |
Impact - Seasoned: | |
Toughness - Unseasoned: | High - 25 Nm and above |
Toughness - Seasoned: | |
Hardness - Unseasoned: | 9.5 |
Hardness - Seasoned: |
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 |
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Lyctid Borer Susceptibility - Other: | |
Termite Resistance: | Not Resistant |
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 |
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Average Specific Extinction Area: | <250 |
Bushfire Resistance: | BAL 12.5 and 19 – All AS3959 required applications |