Flindersia bourjotiana, F. schottiana. Family: Rutaceae.
Queensland silver ash (F. bourjotiana only), northern silver ash, southern silver ash, cudgerie, bumpy ash
|Description and natural occurrence|
A medium-sized, slim boled tree attaining a height of 35 m and 1 m stem diameter. The trunk is usually well formed and circular in cross-section. The bark, which is approximately 15 mm thick, is fairly smooth or finely warted. The tree can usually be recognised by swellings on the tree bole covering overgrown circles of broken-off limbs, giving it the local name of 'bumpy ash'.
It is distributed mainly in the rainforest areas of northern New South Wales, and southern and northern Queensland.
F. bourjotiana - Mt Fox (south-west of Ingham) to Cooktown
F. schottiana - northern New South Wales to Gladstone; areas of the Atherton Tableland
Density. 640-675 kg/m3 at 12 per cent moisture content; approximately 1.5 m3 of seasoned sawn timber per tonne
Strength groups. S4 unseasoned; SD5 seasoned
Stress grades. F7, F8, F11, F14 (unseasoned); F8, F11, F14, F17 (seasoned), when visually stress graded in accordance with AS 2082:2000, Timber - hardwood - visually stress-graded for structural purposes
Joint groups. J3 unseasoned; JD3 seasoned
Shrinkage to 12% MC. F. bourjotiana: 5.5% (tangential); 3.0% (radial). F. shottiana: 4.8% (tangential); 3.1% (radial)
Unit shrinkage. 0.29-0.31 per cent (tangential); 0.20-0.21 per cent (radial), respectively. These values apply to timber reconditioned after seasoning
Durability above-ground. Class 3 - life expectancy 7 to 15 years
Durability in-ground. Class 3 - life expectancy 5 to 15 years
Lyctine susceptibility. Untreated sapwood susceptible to lyctid borer attack
Termite resistance. Not resistant
Preservation. Sapwood readily accepts preservative impregnation but penetration of heartwood is negligible using currently available commercial processes.
Seasoning. Can be satisfactorily dried using conventional air and kiln seasoning methods
Hardness. Firm (rated 4 on a 6-class scale) in relation to indentation and ease of working with hand tools
Machining. Machines and turns well to a smooth surface
Fixing. No difficulty has been experienced with the use of standard fittings and fastenings
Gluing. Can be satisfactorily bonded using standard procedures
Finishing. Will readily accept stain, polish and paint
Decorative. Furniture, plywood, laminated beams, laminated bench tops, shop and office fixtures, flooring, lining, joinery, mouldings, parquetry flooring, turnery, carving, picture frames
Others. Boat building, marine plywood, structural plywood, coach, vehicle and carriage building, aircraft construction. Has been used for tool handles (axe, adze, pick), scaffold planks, sporting goods (baseball bats, archery bows, billiard cues, cricket stumps, skis), bentwork, draughtsperson´s implements, gun stocks, drum sticks, dowelling, fishing rods, boat oars, walking sticks, brush stock, broom handles
Sapwood. Creamy-white to pale yellow, indistinguishable from the heartwood.
Heartwood. Creamy-white to pale yellow.
Texture. Medium and uniform, without figure but possessing a sheen.
Growth rings. Absent.
Vessels. Medium to small in size, arranged in short radial multiples; sometimes containing yellowish deposits. Vessel lines visible on longitudinal surfaces.
Parenchyma. Mostly in irregularly spaced apotracheal bands.
Rays. Visible without a lens.
Burning splinter test. Match size splinter burns to a full white ash.
Boland, DJ, Brooker, MIH, Chippendale, GM, Hall, N, Hyland, BPM, Johnston, RD, Kleinig, DA and Turner, JD (2006). Forest trees of Australia. CSIRO, Australia.
Bootle, K (2005). Wood in Australia. Types, properties and uses, (2nd edition). The McGraw-Hill Companies.
Hopewell, G (Ed) (2006). Construction timbers in Queensland: properties and specifications for satisfactory performance of construction timbers in Queensland, Class 1 and Class 10 buildings (Books 1 and 2). Department of Primary Industries and Fisheries, Brisbane.
Ilic, J (1991). CSIRO atlas of hardwoods. Crawford House Press.
Standards Australia (2000). AS 2082-2000: Timber - hardwood - visually stress-graded for structural purposes. Australian Standard. Distributed by SAI Global Limited.