Grain is usually straight,
open and even. It is occasionally coarse-grained or fiddlebacked.
Growth rings are visible and usually conspicuous.
Texture
Uniform and smooth.
Durability
Class 3&4 (AS 1604).
When used for exterior applications it should be painted
or given a protective coating.
Lyctid susceptibility
Sapwood is generally susceptible.
Sizes
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.
Density
Approximately 700 kg/m3
at 12% moisture content. Unseasoned density approximately
1000 kg/m3.
Shrinkage
(from green to 12% MC)
Approx. 5.5% radial, 11%
tangential before reconditioning; 3.5% radial, 6.5% tangential
after reconditioning.
Movement
Between 25% and 5% MC,
radial movement is approximately 0.23% per 1% MC change;
tangential movement about 0.36% per 1% MC change.
Strength Groups
Seasoned SD3 and SD4,
unseasoned S3 and S4.
Joint Group
Seasoned JD3, unseasoned
J3.
Structural Grades
Most commonly available
stress grades are F17 seasoned, F8 unseasoned.
Toughness (Izod)
13J unseasoned, 18J seasoned.
Hardness (Janka)
4.2kN unseasoned, 5.7kN
seasoned.
Early Fire
Hazard Indices (AS 1530)
Ignitability
14
Spread
of flame
8
Heat
evolved
7
Smoke
developed
8
Workability
General
Tasmanian Oak is highly resilient
and relatively easy to work.
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
Boring Easy to drill. Holes are usually
clean and to size.
Rebating
+ Mortising
Generally produces excellent results.
Turning
Turns well with sharp arises.
Nailing
Material tends to split, particularly when
straight grained. 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 a radius of 100mm.
Finishing
Readily worked to a smooth, lustrous surface.
Most finishes adhere very well. Stains very well.
