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Karri
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

Audas, J.W.,Native Trees of Australia,Whitcombe & Tombs PTY. LtdBanks, C.H., Schoeman, J.P., Otto, K.P.,1977,The Mechanical Properties of Timbers with particular reference to South,Africa,South African Forestry Research Institute Bulletin,(Ed.,Schoeman, J.P. 1973 & Otto K.P. 1976,No.48Banks, C.H.,1954,The Mechanical Properties of Timbers with Particular Reference to those,grown in the Union of South Africa,Journal of the South African Forestry Association,No. 24 pp.44-65,[South,African Forestry Journal]Boas, I.H.,1947,The Commercial Timbers of Australia - Their Properties and Uses,Council for Scientific and Industrial Research, MelbourneBolza, E., Keating, W.G.,1972,African Timbers - the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building ResearchBolza, 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, AustraliaBolza, E., Kloot, N.H.,1963,The Mechanical Properties of 174 Australian Timbers,C.S.I.R.O. Division of Forest Products Technological Paper,No.25Brown, W.H.,1978,Timbers of the World, No. 8 Australasia,TRADA, Red Booklet SeriesChudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.Farmer, R.H.,1972,Handbook of Hardwoods,HMSOForestry Commission of New South Wales,1987,Timbers used in New South Wales for Domestic Buildings,Forestry Commission of New South Wales, Technical Publication No.6Gay, F.J., Et al,1955,Standard laboratory colonies of termites for evaluating the resistance of,timber, timber preservatives and other materials to termite attack.,C.S.I.R.O., Australia Bulletin,No.277Hillis, W.E. and A.G. Brown, Editors. 1984. Eucalyptus for Wood Production. Commonwealth Scientific and Industrial Research Organization, Academic Press, Australia.HMSO.1972.Handbook of Hardwoods, 2nd Edition.Revised by R.H. Farmer.Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Her Majesty's Stationery Office, London.Howard, A.L.,1948,A Manual of Timbers of the World.,Macmillan & Co. Ltd. London 3rd ed.Kloot, N.H. and E. Bolza. 1961. Properties of Timbers Imported into Australia. Division of Forest Products Technological Paper No. 12. Commonwealth scientific and Industrial Research Organization, Melbourne, AustraliaKukachka, B.F.,1970,Properties of Imported Tropical Woods,Forest Research Paper FPL 125Lauricio, F.M., Bellosillo, S.B.,1966,Fifth Progress Report on the Mechanical and Related Properties of,Philippine woods,Philippine Lumberman,12(5,p66Lavers, G. M.1966.The Strength Properties of Timbers.Forest Products Research Bulletin, No. 50.Ministry of Technology, Her Majesty's Stationery Office, London.Lavers, G.M.,1983,The Strength Properties of Timber (3rd ed. revised Moore G.L.,Forest Products Research Laboratory, Princes Risborough, Building Research,Establishment Report (formerly Bulletin No.50)Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc., Fresno, California.Patterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical PressRendle, B.J.,1969,World Timbers (3 Vols.,Ernest Benn Ltd. LondonScott, M.H.,1935,Weights of South African Growth Timbers,South African Department of Agriculture and Forestry Bulletin,No.145,Forest Products Institute, Forestry Series No.1Scott, M.H.,1953,Utilisation Notes on South African Timbers,South African Forestry Department Bulletin No.36South African Lumber Millers Assoc.,1969,Notes on some Commercially Available Hardwoods,S.A.L.M.A. Timber Info. Centre Timber Technical Guide,No.1Stewart, A.M., Kloot, N.H.,1957,Mechanical Properties of Timbers,C.S.I.R.O., Australia Bulletin,No.279T.R.A.D.A.,1982,Timbers for river and sea constructions,TRADA Wood Information Section 0, Sheet 6Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7U.S.D.A. Forest Service,1974,Wood Handbook,U.S.A. Department of Agriculture, Forest Service Handbook,72Wallis, 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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