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Tasmanian Oak - Technical details

Properties

Colour
Generally straw to light, reddish brown.
General availability
Tasmanian oak is readily available.
Sizes
Dressed seasoned timber 40 to 285 mm wide by 12 to 40 mm thick. Undressed seasoned timber 50 to 300 mm wide by 19 to 50 mm thick. Lengths up to 5400 mm long are available, with the bulk of production between 2700 and 4200 mm long.
Grain
Grain is usually straight, open and even. It is occasionally coarse-grained or fiddle backed. Growth rings are visible and usually conspicuous.
Texture
Uniform and smooth.
Durability description
Termite resistance of heartwood: Not resistant. When used for exterior applications it should be painted or given a protective coating. Refer to AS 5604-2005 Timber - Natural durability ratings.
Durability
In ground: Class 4 Above ground: Class 3
Movement - shrinkage
Approx. 5.5% radial, 11% tangential before reconditioning; 3.5% radial, 6.5% tangential after reconditioning.
Density
Unseasoned: Approx. 1000 kg/cu m Seasoned: Approx. 700 kg/cu m at 12% moisture content
Strength group
Unseasoned: S3 Seasoned: SD3
Joint group
Unseasoned: J3 Seasoned: JD3
Structural grades
Most commonly available stress grades are F17 seasoned, F8 unseasoned.
Toughness (Izod)
Unseasoned: 13.0 Seasoned: 18.0
Hardness (Janka)
Unseasoned: 4.2 Seasoned: 5.7

Fire hazard properties

Fire hazard properties: flooring (AS ISO 9239.1)

Critial readiant heat flux:

Between 2.2 and 4.5 kW/m2

Smoke development rate:

Less than 750 %-min
Fire hazard properties: wall and ceiling lining (AS/NZ 3837)

Material group:

3

Average extinction area:

Less than 250 m2/kg

General workability

Blunting
Moderate. Can be severe in dense material.
Sawing
Cuts fairly cleanly with moderate feeding force.
Planing
Moderate feeding forces required. Surfaces very smooth and lustrous when working "with" the grain.
Moulding
Surfaces are true and clean, even end grain. Holds edges well
Boring
Easy to drill. Holes are usually clean and to size.
Rebating + Mortising
Generally produces excellent results.
Nailing
Pre-drilling is often necessary in seasoned or denser material. Nails hold well.
Gluing
Glues satisfactorily with most common adhesives.
Bending
A good to fair bending timber. 25mm material bends reasonably well to radius of 100mm.
Finishing
Readily worked to a smooth, lustrous surface. Most finishes adhere very well. Stains very well.