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Brown mallet
Brown mallet (Eucalyptus astringens)

Family: Myrtaceae

Common names: Brown mallet, Ironbark

Distributed in: India (Oceania and S.E. Asia)

Distribution overview: South western region of western Australia.

Common uses: Bridge beams, Bridge construction, Bridge joists, Building construction, Building materials, Cabin construction, Construction, Crossties, Factory construction, Foundation posts, Heavy construction, Mine timbers, Posts, Railroad ties, Stakes

Product sources: Brown mallet trees are of considerable importance since the bark is a rich source of tannin.

Environment profile: Status has not been officially assessed

Tree size: Trunk diameter is 200-250 cm

Colors: the heart isWhite, Yellowand the sapwoodWhite, Yellow.The grain isInterlocked, the textureUniform

Natural durability: Resistant to powder post beetles, Susceptible to insect attack

Kiln Drying Rate: Slow

Drying Defects: Distortion, Internal Honeycombing Possible

Ease of Drying: Rapidly

Comments: The timber is tough, and is superior in that respect to American ash (Fraxinus americana ), Karri (Eucalyptus diversicolor ), or Spotted gum (E. maculata ). It is also described as dense and very hard, with its toughness increasing on drying

Blunting Effect: Moderate

Cutting Resistance: Moderate to saw

Gluing: Fairly Easy to Very Easy

Nailing: Fair to Good , Fairly Difficult to Very Difficult

Planing: Very Good to Excellent

Resistance to Impregnation: Resistant sapwood

Response to hand tools: Fairly Difficult to Difficult to Work

Routing recessing: Fair to Good Results

Veneering qualities: Veneers easily, Veneers moderately easy

Steam bending: Very Good to Excellent Results

Screwing: Fairly Easy to Very Easy ; Turning: Fairly Easy to Very Easy

Polishing: Very Good to Excellent; Staining: Very Good to Excellent; Varnishing: Very Good to Excellent;

  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 993 kg/m3
Bending Strength 1130 1791 kg/cm2
Crushing Strength 124 206 kg/cm2
Hardness 1451 kg
Impact Strength 63 cm
Shearing Strength 198 kg/cm2
Stiffness 153 184 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage %
Weight kg/m3
Maximum Load cm-kg/cm3
Toughness 415 cm-kg
Static Bending 655 888 kg/cm2
Item Green Dry English
Bending Strength 16072 25480 psi
Crushing Strength 1764 2940 psi
Density 62 lbs/ft3
Hardness 3200 lbs
Impact Strength 25 inches
Maximum Crushing Strength 7585 13328 psi
Shearing Strength 2827 psi
Static Bending 9330 12642 psi
Stiffness 2185 2626 1000 psi
Toughness 361 inch-lbs
Weight 61 50. lbs/ft3


Bolza, E., Kloot, N. H. 1963. The Mechanical Properties of 174 Australian Timbers. Technological Paper No. 25. Division of Forest Products, Center for Scientific and Industrial Organization (CSIRO, Melbourne, Australia.Hillis, W.E. and A.G. Brown, Editors. 1984. Eucalyptus for Wood Production. Commonwealth Scientific and Industrial Research Organization, Academic Press, Australia.Wallis, N.K. 1956. Australian Timber Handbook. Sponsored by The Timber Development Association of Australia. Angus & Robertson, Ltd., 89 Castlereagh Street, Sydney, Australia.
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