Wood
-Strong and nature.
Jarrah (Eucalyptus marginata)
Process
-The interlocked or wavy grain makes cutting difficult, and requires a special plane angle to prevent the grain from tearing. As with preservative treatments, this wood is finished with wax or varnish to preserve the natural colour.
Technical information
-Jarrah is a reddish wood, with pick to dark red sapwood turning brown with age. The heartwood is a dark, rich, brownish red with dark brown radial flick marks. Over time, heart wood turns a rich mahogany shade.
-Requires sharp tools on the curly grain.
-Steam bends moderately well, turns easily, glues and finishes well
-It is considerable harder than most North American and European hardwoods, including oak, sweet birch and walnut.
- It’s a heavy timber with a specific gravity of 1.1 when green.
Limitations
-Eucalyptus marginata tree grows up to 130 feet high, with a trunk up to 10 feet in diameter.
-Jarrah wood can withstand 16,200 lbs. per square inch (psi) of bending strength when dry, and 1750 psi of crushing strength.
Normal Usage
- Cabinet making
-Doors and window sills, Flooring
-Paneling
-Outdoor furniture.
-Particularly suited for structural material such as bridges, railway sleepers, telegraphs poles and wharves.
Environmental impact
-Can be recycles but nowadays old growth Jarrah has been seriously depleted.
-Can be re-used.
Advantages
-Highly decay resistant heartwood.
-In addition to its strength and durability, jarrah wood resists attack by marine borers, termites and powder post beetles.
-Resist to fire.
Disadvantages
-Its extreme density makes it difficult to treat with preservatives.
-More highly prized.
-Suffers from root rot fungus.
-Can be difficult to work due to dense hardness.
-Required pre-drill for nails and screws.
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