Jarrah
Scientific Name:
Eucalyptus marginata
Other Names and Species:
Eucalyptus
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The tree species jarrah, Eucalyptus marginata, grows up to 130 feet tall and can live to up to 1,000 years old. Jarrah is a rich, reddish timber and it is prized for its rich warm color. Heartwood is uniformly pinkish to dark red, turning a deep brownish red with age and exposure; sapwood is pale. Frequet black streaks. Variations within species and grades.
Weight:
Jarrah is heavy and hard. Basic specific gravity (ovendry weight/green volume) 0.68; air-dry density 54 pcf.
Use:
Jarrah has been use for fine furniture, cabinets, wall paneling, flooring, docks, bridges, and decking.
General Characteristics:
Jarrah undergoes a medium degree of color change over time by muting to a medium to dark burgundy-red as it ages. It sands well. Good at machining. Difficult to nail and requires pre-boring, but it has good nail-holding abilities. Steam-bends moderately well.
Working Properties:
Fairly difficult to work due to hardness and density. Reduced cutting angle recommended for planing. Turns well. The timber is very dense, and material containing irregular grain is reported to be rather difficult to bore and work in mortising, moulding, and carving, especially with dull tools.
Pre-drilling required for screwing and nailing. Glues and finishes well. It sands well. Sharp cutters are reported to be essential to produce cleanly worked surfaces.
Drying and Shrinkage:
The material is reported to require careful drying. Partial air-seasoning before kiln-drying has been recommended. Recommended Kiln schedules: T3 – C2 (4/4); T3 – C1 (8/4) US (Schedule C – United Kingdom). Kiln-drying from the green condition should be done at low temperatures and high humidities. Shrinkage from green to 12% MC, Radial – 4.6%, Tangential – 6.6%
Durability:
Jarrah is extremely durable and resistant to insect attack, making Jarrah available for indoor and outdoor uses. The wood is also reported to be fire-resistant.
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