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Northern bolly gum
Northern bolly gum (Blepharocarya involucrigera)

Family: Anacardiaceae

Common names: Northern bolly gum, Rose butternut

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

Common uses: Cabinetmaking, Cooperages, Flooring, Furniture, Paneling

Tree size: Tree height is 0-10 m

Colors: the heart isPale red to pink, Redand the sapwoodRed, White to yellow.The grain isWeak figure, the textureMedium to coarse

Natural durability: Non durable, Susceptible to attack from powder post (Lyctid & Bostrychid) beetles

Tree Identification: Bole/stem form is straight

Blunting Effect: Blunting effect on machining is slight



  • Numerical data Metric
  • Numerical data English
  • Strength properties
  • References
Item Green Dry Metric
Specific Gravity
Density 560 kg/m3
Bending Strength kg/cm2
Crushing Strength kg/cm2
Hardness kg
Impact Strength cm
Shearing Strength kg/cm2
Stiffness 1000 kg/cm2
Tangential Shrinkage %
Radial Shrinkage 3 %
Weight 544 432 kg/m3
Maximum Load cm-kg/cm3
Toughness cm-kg
Static Bending kg/cm2
Item Green Dry English
Density 35 lbs/ft3
Weight 34 27 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 7 %

Density (dry weight) = 31-37 lbs/cu. ft.
Density (dry weight) = 38-45 lbs/cu. ft.
Shrinkage, Tangential = moderate
Shrinkage, Radial = small

Bolza, E.,1976,Timber and Health,Div. Building Res. C.S.I.R.O. AustraliaBudgen, B.,1981,Shrinkage and density of some Australian and South-East Asian Timbers,C.S.I.R.O. Div. building Res. Tech Paper(2nd Series) No.38Cause, M.L.; Rudder, E.J. and Kynaston, W.T.,1989,Queensland Timbers Their Nomenclature, Density, and Lyctid Susceptability,Queensland Department of Forestry, Technical Pamplet No.2Francis, W.D.,1951,Australian Rain-forest Trees,Commonwealth of Australia - Forestry and Timber BureauPatterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical Press
*Come interpretare i dati (manleva su eventuali imprecisioni)