Corymbia gummifera, C. intermedia C. polycarpa. Family: Myrtaceae
Pale bloodwood (C. gummifera); pink bloodwood (C. intermedia); pale bloodwood; long-fruited bloodwood (C. polycarpa)
- Medium-sized hardwood tree.
- Grows to 35m high and 1m diameter.
- Reddish brown, scaly bark covers the whole tree.
- Freely exudes red-coloured kino gum.
- Relatively common in coastal areas from New South Wales to Queensland.
- Heartwood is dark pink, deep red to red-brown, often with an abundance of kino veins.
- Sapwood is pale pink to light brown.
- Grain is generally interlocked and coarse.
- Kino veins are often large and concentric.
- Engineering: used, previously, as poles, piles, sleepers and mining timbers.
- Construction: fencing and house stumps.
- Others: hardboard manufacture.
- Density: 1010kg/m3 at 12% moisture content; about 1.0m3 of seasoned, sawn timber per tonne.
- Strength groups: S3 unseasoned, (SD3) seasoned (brackets indicate provisional value).
- Stress grades. F8, F11, F14, F17 (unseasoned); F14, F17, F22, F27 (seasoned) when visually stress-graded according to AS 2082—2000: Timber—Hardwood—Visually stress-graded for structural purposes.
- Joint groups: J1 unseasoned, JD1 seasoned.
- Shrinkage to 12% MC: 4.0% (tangential), 3.0% (radial).
- Unit shrinkage: not available.
- Durability above-ground: Class 1 (life expectancy more than 40 years).
- Durability in-ground: Class 1 (life expectancy more than 25 years).
- Lyctine susceptibility: untreated sapwood susceptible to lyctid borer attack.
- Termite resistance: C. gummifera and C. polycarpa are not resistant; C. intermedia is resistant.
- Preservation: sapwood readily impregnates with preservative.
- Seasoning: seasons satisfactorily but the kino veins may open.
- Hardness: very hard (rated 1 on a 6-class scale) to indent and working with hand tools.
- Machining: due to kino veins, red bloodwood is usually used as a round, rather than sawn, timber.
- Fixing: no difficulty using standard fittings and fastenings.
- Gluing: as with most high-density species, machine and prepare surface immediately before gluing.
- Finishing: readily accepts paint, stain and polish.
- Sapwood: pale pink to light brown, distinct from heartwood.
- Heartwood: pale pink, light red to dark red, red-brown (majority).
- Texture: coarse open texture, often interlocked grain; concentric gum veins are common.
- Growth rings: absent, but some specimens have zonate vessel formations.
- Vessels: medium to large, visible to the unaided eye, numerous; double and multiple pores in radial alignment; prominent vessel lines; vessels tylosed.
- Parenchyma (soft tissue): very abundant, diffuse and paratracheal—may form zonate bands.
- Rays: fine.
- Burning splinter test: match-size splinter burns to charcoal.
Research and resources
- Boland, DJ, Brooker, MIH, Chippendale, GM, Hall, N, Hyland, BPM, Johnston, RD, Kleinig, DA and Turner, JD 2006, Forest trees of Australia, 5th ed., CSIRO Publishing, Collingwood Australia.
- Bootle, K 2005, Wood in Australia: Types, properties and uses, 2nd ed., McGraw-Hill, Sydney.
- Ilic, J 1991, CSIRO atlas of hardwoods, Crawford House Press, Bathurst, Australia.
- Queensland Government, DAF 2018, Construction timbers in Queensland: Properties and specifications for satisfactory performance of construction timbers in Queensland. Class 1 and Class 10 buildings, Books 1 & 2, Department of Agriculture and Fisheries, Brisbane.
- Standards Australia, 2000, AS 2082—2000: Timber—Hardwood—Visually stress-graded for structural purposes, Standards Australia International, Strathfield, NSW.
- Last reviewed: 12 Dec 2018
- Last updated: 12 Dec 2018