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Boring
Comments
Common Names
Common Uses
Corrosive Properties
Countries of Distribution
Distribution Overview
Drying Defects
Ease of Drying
Family Name
Gluing
Grain
Heartwood Color
Kiln Drying Rate
Kiln Schedules
Nailing
Natural Durability
Numerical Data
Painting
Planing
Polishing
References
Regions of Distribution
Response to Hand Tools
Scientific Name
Screwing
Staining
Steam Bending
Strength Properties
Texture
Trade Name
Tree Identification
Tree Size

Scientific Name
Agathis microstachya

Trade Name
Black kauri pine

Family Name
Araucariaceae

Wood Image 1

Wood Image 1

Wood Image 1

Wood Image 1

Common Names
Black kauri pine, Bull kauri, Kauri, Kauri pine, North Queensland kauri, Queensland kauri

Regions of Distribution
Oceania and S.E. Asia

Countries of Distribution  [VIEW MAP]
Australia

Common Uses
Agricultural implements, Boat building (general), Boxes and crates, Cabinetmaking, Carvings, Flooring, Food containers, Furniture, Joinery, Light construction, Matches, Mathematical instruments, Musical instruments, Plywood, Pulp/Paper products, Sporting Goods, Toys, Turnery, Vats, Veneer

Distribution Overview
Occurs in Australia in N Queensland. Almost entirely confined to rainforests of the Atherton Tableland, at latitude 17-18° S and elevations of 400-900 m. The mean maximum temperature of the hottest month is 30°C and the mean minimum of the coldest month is 10°C (data for Atherton station). Precipitation is 1400-3300 mm, concentrated in the summer months, reaching a minimum of 25 mm in the driest month (August or September). Soils are deep loams to clays on varied silicic substrates. As with most species of Agathis, it grows as a rainforest emergent in a canopy composed of hundreds of different tree species.

Heartwood Color
Red
White
Brown
Pink
White to cream
Pale red to pink
Pale brown


Grain
Straight
Even

Straight


Texture
Fine
Fine


Natural Durability
Non-durable
Perishable
Susceptible to insect attack
Non-resistant to termites
Non-resistant to marine borers
Resistant to powder post beetles
Non durable
Susceptible to marine borer attack
Susceptible to attack from termites (Isoptera)
Resistant to attack from powder post (Lyctid & Bostrychid) beetles


Corrosive Properties
Non-corrosive


Kiln Schedules
Kiln Drying Rate (in days) is fairly rapid
Drying (speed) is fast
Dry at a moderate speed


Drying Defects
Collapse
Internal Honeycombing Possible
Slight collapse and honeycomb


Ease of Drying
Fairly Easy
Rapidly
Slowly
Easy


Kiln Drying Rate
Rapid
Drying rate is fairly rapid to fast
Naturally dries quickly
Naturally dries at a moderate speed
Rapid (<10 days for boards < 32 mm, to <30 days for boards >= 63 mm)


Tree Identification
Bole/stem form is straight
Bole/stem form is cylindrical


Tree Size
Tree height is 50-60 m
Tree height is 40-50 m
Trunk diameter is 100-150 cm
Bole length is 30-40 m
Trunk diameter is 150-200 cm
Trunk diameter is 300-350 cm
Trunk diameter is 250-300 cm
Trunk diameter is 200-250 cm


Comments
General finishing qualities are rated as good

Boring
Fair to good results
Fairly easy to very easy
Moderately easy


Gluing
Fairly Easy to Very Easy
Easy to glue


Nailing
Fair to Good Results
Fairly Easy to Very Easy
Very Good to Excellent Results
Holds satisfactorily
Holds nails well
Easy to nail


Planing
Very Good to Excellent Results
Fair to Good Results
Planes well, to a good finish


Response to Hand Tools
Easy to Work
Easy to machine


Screwing
Fair to Good Results
Screwing yields satisfactory results


Steam Bending
Fair to Good Results
Moderate


Painting
Very Good to Excellent Results
Fair to Good Results
Good results


Polishing
Fair to Good Results
Very Good to Excellent Results
Good results


Staining
Fair to Good Results
Very Good to Excellent Results
Finish is generally good
Staining (Characteristic) = non-staining


Strength Properties
Density (dry weight) = 31-37 lbs/cu. ft.
Max. crushing strength = low
Bending strength (MOR) = low
Shearing strength (parallel to grain) = very low
Shrinkage, Tangential = very small
Shrinkage, Tangential = small
Shrinkage, Radial = very small
Modulus of Elasticity (stiffness) = very low
Modulus of Elasticity (stiffness) = low
Density (dry weight) = 23-30 lbs/cu. ft.
Shrinkage, Radial = small
Shearing strength (parallel to grain) = low


Numerical Data
ItemGreenDryEnglish
Bending Strength61119589psi
Density30lbs/ft3
Maximum Crushing Strength21393916psi
Shearing Strength1052psi
Stiffness118813831000 psi
Weight2925lbs/ft3
Radial Shrinkage2%
Tangential Shrinkage5%
ItemGreenDryMetric
Bending Strength429674kg/cm2
Density480kg/m3
Maximum Crushing Strength150275kg/cm2
Shearing Strength73kg/cm2
Stiffness83971000 kg/cm2
Weight464400kg/m3
Radial Shrinkage2%

References
Boas, I.H.,1947,The Commercial Timbers of Australia - Their Properties and Uses,Council for Scientific and Industrial Research, Melbourne

Brown, W.H.,1978,Timbers of the World, No. 8 Australasia,TRADA, Red Booklet Series

Dallimore, W. and Jackson, A. Bruce,1966,A Handbook of Coniferae and Ginkgoaceae Fourth Ed. Revised by S.G.,Harrison,Edward Arnold (Publishers) Ltd. London

Forest Products Research Laboratory U.K.,1957,A Handbook of Softwoods,Department of Scientific and Industrial Research Forest Products Research,HMSO

Hall, N., Et al,1972,The use of trees and shrubs in the dry country of Australia,Australian Government, Department of National Development, Forest and,Timber Bureau, Canberra

Howard, A.L.,1948,A Manual of Timbers of the World.,Macmillan & Co. Ltd. London 3rd ed.

Keating, W.G., Bolza, E.,1982,Characteristics properties and uses of timbers. South East Asia, Northern,Australia and the Pacific,C.S.I.R.O. Div. Chemical Technology,Inkata Press,1

Patterson, D.,1988,Commercial Timbers of the World, 5th Edition,Gower Technical Press









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