Marri (Eucalyptus calophylla)
Family: Myrtaceae
Common names: Marri, Red gum
Distributed in: Australia, India, Nigeria, South Africa (Africa, Oceania and S.E. Asia)
Common uses: Boat building: framing, Boxes and crates, Charcoal, Chemical derivatives, Heavy construction, Light construction, Pulp/Paper products, Tool handles, Vehicle parts
Tree size: Trunk diameter is 100-150 cm
Colors: the heart isRed, Yellow to golden-yellow to orangeThe grain isStraight, the textureMedium to coarseand the lusterLustrous
Natural durability: Very durable, Very durable
Drying Defects: Collapse, Expect resin/gum exudation
Ease of Drying: Fairly Easy
Comments: General finishing qualities are rated as good
Planing: Easy to plane
Response to hand tools: Easy to machine
Steam bending: Very Good to Excellent Results
- Numerical data Metric
- Numerical data English
- Strength properties
- References
 |
 |
 |
 |
Item |
Green |
Dry |
Metric |
Specific Gravity |
|
|
|
Density |
|
753 |
kg/m3 |
Bending Strength |
654 |
1024 |
kg/cm2 |
Crushing Strength |
485 |
699 |
kg/cm2 |
Hardness |
|
752 |
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
109 |
kg/cm2 |
Stiffness |
152 |
175 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
5 |
|
% |
Weight |
737 |
592 |
kg/m3 |
Maximum Load |
|
|
cm-kg/cm3 |
Toughness |
|
|
cm-kg |
Static Bending |
|
|
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | 9310 | 14566 | psi | Density | | 47 | lbs/ft3 | Hardness | | 1658 | lbs | Maximum Crushing Strength | 6899 | 9945 | psi | Shearing Strength | | 1560 | psi | Stiffness | 2167 | 2494 | 1000 psi | Weight | 46 | 37 | lbs/ft3 | Radial Shrinkage | 5 | | % | Tangential Shrinkage | 9 | | % | |
Shearing strength (parallel to grain) = low Modulus of Elasticity (stiffness) = high Max. crushing strength = high Hardness (side grain) = medium Bending strength (MOR) = medium Shrinkage, Tangential = large Shrinkage, Tangential = fairly large Shrinkage, Radial = large Shrinkage, Radial = fairly large Density (dry weight) = 46-52 lbs/cu. ft.
Bolza, E., Kloot, N.H.,1963,The Mechanical Properties of 174 Australian Timbers,C.S.I.R.O. Division of Forest Products Technological Paper,No.25Dadswell, H.E., Stewart, C.M.,1962,Chemical utilization of the eucalyptus 1 introducing review to 1956,Australia C.S.I.R.O. Division of Forest Products Technical Paper No.17Gamble, J.S.,1902,A Manual of Indian Timbers,Sampson Low, Marston & Co. LondonHall, N., Et al,1970,Forest Trees of Australia,Australian Government Publishing Service, CanberraHoward, A.L.,1948,A Manual of Timbers of the World.,Macmillan & Co. Ltd. London 3rd ed.Kingston, R.S.T., Risdon, C.J.E.,1961,Shrinkage and Density of Australian and other South-West Pacific Woods,C.S.I.R.O. Division of Forest Products Technological Paper No.13Purkayastha, S.K.,1982,Indian woods: Their identifications, properties and uses, Vol. IV,Myrlacene to Symploceae,Controller of Publications, New DelhiSarlin, P.,1954,Bois et forets de la Nourelle Caledoiue,C.T.F.T. Publication 6Streets, R.J.,1962,Exotic Forest Trees in the British Commonwealth,Clarendon Press OxfordThe Australian Forestry Journal,1922,Marri (Eucalyptus calophylla) for boat knees,Australian Forestry Journal 5(8) p217
|