Karri (Eucalyptus diversicolor)
Family: Myrtaceae
Common names: Karri
Distributed in: Australia (Oceania and S.E. Asia)
Distribution overview: Southwestern Australia
Common uses: Agricultural implements, Beams, Boat building (general), Boxes and crates, Bridge beams, Bridge construction, Bridge joists, Building construction, Building materials, Cabin construction, Cabinetmaking, Chairs, Construction, Domestic flooring, Factory construction, Factory flooring, Flooring, Flooring: industrial heavy traffic, Furniture, Handles: general, Heavy construction, Joinery, Ladders, Marine construction, Mine timbers, Parquet flooring, Piling, Plywood, Rafters, Railroad ties, Roofing, Sporting Goods, Structural work, Sub-flooring, Toys, Vehicle parts, Veneer, Wharf construction
Environment profile: Status has not been officially assessed
Tree size: Trunk diameter is 100-150 cm
Colors: the heart isReddish brown, Yellowand the sapwoodColor not distinct from heartwood, Paler than heartwood.The grain isWavy, the textureModerately coarse
Natural durability: Susceptible to attack from termites (Isoptera), Susceptible to marine borer attack
Odor: No specific smell or taste
LightInduced Color Change: Darker
Kiln Schedules: Kiln Drying Rate (in days) is rather slow
Partial air-drying before kiln drying is recommended.
Kiln Drying Rate: Slow (18-28 days for boards < 32 mm, to 52-84 days for boards >= 63 mm)
Drying Defects: Slight collapse and honeycomb, Slight twist/warp
Ease of Drying: Requires special attention
Comments: General finishing qualities are rated as good The timber is similar in appearance to Jarrah (Eucalyptus marginata ). Dry heartwood splinter test can be used to differentiate between the two: karri burns to a thick white ash, while jarrah burns to a black, ashless charcoal.
Blunting Effect: High effect
Boring: Difficult
Cutting Resistance: Difficult to saw
Gluing: Satisfactory gluing properties
Nailing: Difficult to nail, Holds nails well
Planing: Ease of planing is moderate
Resistance to Impregnation: Sapwood is treatable
Response to hand tools: Moderate working qualities
Veneering qualities: There is slight to moderate drying degrade and the potential for buckles and splits
Steam bending: Moderate
Screwing: Screwing yields good results
; Turning: Difficult to turn
Polishing: Satisfactory; Staining: Finish is generally satisfactory
;
- Numerical data Metric
- Numerical data English
- Strength properties
- References
 |
 |
 |
 |
Item |
Green |
Dry |
Metric |
Specific Gravity |
0,63 |
0,8 |
|
Density |
|
897 |
kg/m3 |
Bending Strength |
809 |
1345 |
kg/cm2 |
Crushing Strength |
76 |
106 |
kg/cm2 |
Hardness |
|
911 |
kg |
Impact Strength |
|
|
cm |
Shearing Strength |
|
151 |
kg/cm2 |
Stiffness |
153 |
189 |
1000 kg/cm2 |
Tangential Shrinkage |
|
|
% |
Radial Shrinkage |
5 |
|
% |
Weight |
865 |
849 |
kg/m3 |
Maximum Load |
0,77 |
1,33 |
cm-kg/cm3 |
Toughness |
|
299 |
cm-kg |
Static Bending |
454 |
799 |
kg/cm2 |
|
 |  |  |  | Item | Green | Dry | English | Bending Strength | 11507 | 19142 | psi | Crushing Strength | 1086 | 1509 | psi | Density | | 56 | lbs/ft3 | Hardness | | 2010 | lbs | Maximum Crushing Strength | 6140 | 10266 | psi | Shearing Strength | | 2159 | psi | Static Bending | 6468 | 11368 | psi | Stiffness | 2177 | 2700 | 1000 psi | Toughness | | 260 | inch-lbs | Work to Maximum Load | 11 | 19 | inch-lbs/in3 | Specific Gravity | 0.63 | 0.8 | | Weight | 54 | 53 | lbs/ft3 | Radial Shrinkage | 5 | | % | Tangential Shrinkage | 10 | | % | |
Density (dry weight) = 53-60 lbs/cu. ft 0 Max. crushing strength = high 0 Modulus of Elasticity (stiffness) = high 0 Bending strength (MOR) = high 1 Shearing strength (parallel to grain) = medium 0 Bending strength (MOR) = medium Hardness (side grain) = medium Shrinkage, Tangential = large Hardness (side grain) = hard Density (dry weight) = 46-52 lbs/cu. ft. Shrinkage, Radial = large Density (dry weight) = 61-67 lbs/cu.ft Toughness (total work) = medium Shrinkage, Radial = moderate Shearing strength (parallel to grain) = low Modulus of Elasticity (stiffness) = medium Max. crushing strength = low Bending strength (MOR) = very high
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