Agathis Robusta (Kauri pine )


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Scientific Name
Agathis robusta

Trade Name
Kauri pine

Family Name
Araucariaceae

Synonyms
Agathis browneii

Common Names
Agathis, Almaciga, Bindang, Dakua makadre, Damar minyak, Dammara pine, Dundatha pine, Kauri, Kauri pine, Menghilan, Queensland kauri, Queensland kauri pine, South Queensland kauri, Tolong

Plantation species?
Yes

Regions of Distribution
Africa, Oceania and S.E. Asia

Countries of Distribution  [VIEW MAP]
Australia, Brunei, Cambodia, China, Fiji, India, Indonesia, Laos, Malaysia, Myanmar, New Zealand, Papua New Guinea, Philippines, South Africa, Thailand, Vietnam

Common Uses
Agricultural implements, Boat building (general), Bobbins, Boxes and crates, Building materials, Cabinetmaking, Carvings, Core Stock, Decorative plywood, Decorative veneer, Domestic flooring, Excelsior, Figured veneer, Flooring, Food containers, Furniture, Interior construction, Interior trim, Joinery, Light construction, Matches, Mathematical instruments, Millwork, Moldings, Musical instruments, Paneling , Paneling, Parquet flooring, Picker sticks, Plain veneer, Plywood, Pulp/Paper products, Shade rollers, Shuttles, Specialty items, Spindles, Spools, Sporting Goods, Stencil & chisel blocks, Sub-flooring, Sucker rods, Tables, Toys, Trimming, Turnery, Umbrella handles , Vats, Veneer, Wainscotting

Environmental Profile

Status has not been officially assessed

Distribution Overview

Found in Australia, in two disjunct areas: one in S Queensland between Tewantin and Maryborough (mainland) and on Fraser Island

Heartwood Color

Brown
White
Red
Pink
Yellow
Orange
Pale brown
White to cream
Pale red to pink
Yellow to golden-yellow to orange
Pinkish white
Light brown

Sapwood Color

Red
Brown
Yellow
White
Color not distinct from heartwood

Grain

Straight
Even
Figure
Mottle

 

Straight
Mottled or streaked figure sometimes

Texture

Fine
Even or uniform
Fine
Uniform

Luster

High
Medium
Lustrous

Natural Durability

Non-durable
Perishable
Susceptible to insect attack
Non-resistant to marine borers
Non-resistant to termites
Resistant to powder post beetles
Non-resistant to termites
Non durable
Very little natural resistance
Susceptible to marine borer attack
Susceptible to attack from termites (Isoptera)
Susceptible to attack by marine borers and termites
Resistant to attack from powder post (Lyctid & Bostrychid) beetles

Odor

No specific smell or taste

Corrosive Properties

Non-corrosive

Kiln Schedules

Drying (speed) is fast
Kiln Drying Rate (in days) is fairly rapid
Uk=J US=T10D5S/T8D4S Fr=4
T10 – D5s (4/4); T8 – D4s (8/4) US
Dry at a moderate speed

Drying Defects

Collapse
Internal Honeycombing Possible
Distortion
Collapse and honeycomb in heartwood is possible due to mineral stains and wetwood.

Ease of Drying

Fairly Easy
Rapidly
Medium to High Shrinkage
Slowly
Easy

Drying characteristics have been rated as good

Kiln Drying Rate

Naturally dries quickly
Rapid
Drying rate is fairly rapid to fast
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
Plantation-grown variety tends to grow straighter.

Tree Size

Trunk diameter is 100-150 cm
Tree height is 40-50 m
Tree height is 50-60 m
Trunk diameter is 150-200 cm
Tree height is 20-30 m
Tree height is 10-20 m
Bark width is 25-30 mm
Tree height is 30-40 m
Trunk diameter is 200-250 cm
Trunk diameter is 300-350 cm

Comments
General finishing qualities are rated as good

May include compression wood which can cause excessive longitudinal shrinkage and distortion

Blunting Effect

Little
Moderate
There is some significant blunting effect on cutting tools

Boring

Fairly easy to very easy
Fair to good results
Easy

Important to properly support the stock at the tool exit

Carving

Fairly Easy to Very Easy
Easy to carve

Cutting Resistance

Easy to saw
Low resistance to sawing
Cutting Resistance with dry wood is easy

Gluing

Fairly Easy to Very Easy
Very Good to Excellent Results
Fair to Good Results
Moderate gluing properties

Mortising

Fairly Easy to Very Easy
Fair to Good Results
Support material during mortising to prevent break out.
Finishes well

Moulding

Fair to Good Results
Fairly Easy to Very Easy
Good moulding properties

Movement in Service

Excellent Stability – Small Movement
Fair to Good Stability – Medium Movement
Stable
Holds shape well

Nailing

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

Planing

Fairly Easy to Very Easy
Fair to Good Results
Very Good to Excellent Results
Planes well, to a good finish
Good planing properties
Easy to plane

Resistance to Impregnation

Resistant sapwood
Resistant heartwood
Sapwood has low permeability
Heartwood is resistant

Response to Hand Tools

Easy to Work
Responds Readily
Easy
Easy to machine

Good recessing properties.

Routing & Recessing

Fairly Easy to Very Easy
Routing is easy

Sanding

Fairly Easy to Very Easy
Easy to sand

Screwing

Fair to Good Results
Screwing yields satisfactory results

Turning

Fairly Difficult to Very Difficult
Difficult to turn

Steam Bending

Fair to Good Results
Moderate
Good

Painting

Fair to Good Results
Very Good to Excellent Results
Fairly Easy to Very Easy
Good results
Little or no surface prep required

Polishing

Fair to Good Results
Very Good to Excellent Results
Good results

High polish

Staining

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

Varnishing

Fair to Good Results
Fairly Easy to Very Easy
Good results

Strength Properties

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

Numerical Data

Item Green Dry English
Bending Strength 7741 12807 psi
Density 32 lbs/ft3
Hardness 727 lbs
Maximum Crushing Strength 3227 5785 psi
Shearing Strength 1642 psi
Stiffness 1230 1500 1000 psi
Specific Gravity 0.37
Weight 31 25 lbs/ft3
Radial Shrinkage 2 %
Tangential Shrinkage 4 %
Item Green Dry Metric
Bending Strength 544 900 kg/cm2
Density 512 kg/m3
Hardness 329 kg
Maximum Crushing Strength 226 406 kg/cm2
Shearing Strength 115 kg/cm2
Stiffness 86 105 1000 kg/cm2
Specific Gravity 0.37
Weight 496 400 kg/m3
Radial Shrinkage 2 %

References
Audas, J.W.,Native Trees of Australia,Whitcombe & Tombs PTY. Ltd

Australia – Forestry and Timber Bureau,1957,Forest Trees of Australia,Australia Interior Department, Forestry and Timber Bureau

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

Boone, R.S., C.J. Kozlik, P.J. Bois, E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Hardwoods -Temperate and Tropical. USDA, Forest Service, General Technical Report FPL-GTR-57, Forest Products Laboratory, Madison, Wisconsin.

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

Chudnoff, M.,1984,Tropical Timbers of the World,U.S.A. Department of Agriculture, Forest Service, Forest Products,Laboratory, Madison.

Clifford, N.,1957,Timber Identification for the Builder and Architect,Leonard Hill (Books) LTD. London

Dadswell, H.E., Eckersley, A.M.,1935,The Identification of the Principal Commercial Australian Timbers other,than eucalyptus,Australian C.S.I.R.O. Bulletin NO.90

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

Eddowes, P. J. 1961. Commercial Timbers of Papua New Guinea:Their Properties and Uses. Office of Forests, Papua New Guinea

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

Francis, W.D.,1951,Australian Rain-forest Trees,Commonwealth of Australia – Forestry and Timber Bureau

Fundter, J.M.,1982,Names for Dipterocarp timbers and trees from Asia,Pudoc, Wageningen, Netherlands

Guyana – Forest Department,1951,British Guiana Timbers – Yellow Silverballi,British Guiana Forestry Department Leaflet No. 13

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

Titmuss, F.H.,1965,Commercial Timbers of the World,Technical Press Ltd., London, 3rd edition