Eucalyptus pilularis (Blackbutt)


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Scientific Name
Eucalyptus pilularis

Trade Name
Blackbutt

Family Name
Myrtaceae

Common Names
Blackbutt, Eucalyptus, Grey blackbutt, Pilularis gum

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

Countries of Distribution  [VIEW MAP]
Australia, Brazil, Hawaii [US], Kenya, Madagascar, Nigeria, South Africa, Sri Lanka

Common Uses
Agricultural implements, Bearings & bushings, Boat building (general), Boat building: framing, Boxes and crates, Bridge construction, Cabinetmaking, Charcoal, Decks, Door, Flooring, Flooring: commercial heavy traffic, Fuelwood, Furniture, Handles: general, Heavy construction, Joinery, Ladders, Light construction, Mine timbers, Paneling, Particleboard, Plywood, Poles, Posts, Pulp/Paper products, Railroad ties, Sporting Goods, Structural work, Tool handles, Turnery, Vehicle parts, Veneer, Veneer: decorative

Heartwood Color

Yellow
White
Pale brown
Pale red to pink
Yellow to golden-yellow to orange
Brown

Sapwood Color

Yellow
White
Paler than heartwood
Color not distinct from heartwood

Grain

Straight
Interlocked
Wavy
Closed
Even
Figure
Distinct (figure)

 

Straight
Interlocked
Wavy
Distinct figure

Texture

Coarse
Fine to medium
Medium coarse
Medium
Coarse

Luster

Straight
Interlocked

Natural Growth Defects

Brittleheart is often frequent and extensive

Natural Durability

Perishable
Moderately durable
Resistant to attack from powder post (Lyctid & Bostrychid) beetles
Susceptible to attack from termites (Isoptera)
Durable
Susceptible to marine borer attack
Non durable
Very durable
Pinworms (ambrosia beetles) are commonly present

Kiln Schedules

Dry at a slow speed
UK=C US=T3C2/T3C1 Fr=3

Drying Defects

Internal Honeycombing Possible
Collapse
Distortion
Moderate collapse and honeycombing
Moderate surface checking
Severe surface checking
Moderate twist/warp
Expect slight collapse and honeycombing

Ease of Drying

Moderately Difficult to Difficult
Slowly
Difficult

Kiln Drying Rate

Naturally dries at a moderate speed

Tree Identification

Bole/stem form is straight

Tree Size

Trunk diameter is 100-150 cm
Trunk diameter is 150-200 cm

Comments
General finishing qualities are rated as good

Blunting Effect

Reddish
Orangish
Yellowish
Pinkish
Whitish
Blunting effect on machining is moderate
Blunting effect on sawing dry wood is severe
Blunting effect on machining is fairly severe

Boring

Pinkish
Whitish
Yellowish
Easy

Cutting Resistance

Fairly Difficult to Very Difficult to saw
Cutting Resistance with dry wood is easy

Gluing

Easy to glue
Moderate gluing properties

Nailing

Pre-Boring Recommended
Fairly Difficult to Very Difficult
Pre-boring recommended
Difficult to nail

Planing

Fairly Easy to Very Easy
Poor to Very Poor Results
Fairly Difficult to Very Difficult
Planes well, to a good finish
Easy to plane

Resistance to Impregnation

Permeable sapwood
Resistant heartwood
Resistant sapwood
Heartwood is extremely resistant
Sapwood is moderately resistant
Heartwood is resistant

Response to Hand Tools

Easy to Work
Fairly Difficult to Difficult to Work
Easy to machine
Difficult to machine
Moderate working qualities

Routing & Recessing

Fair to Good Results

Sanding

Easy to sand

Screwing

Pre-boring recommended
Possible if prebored

Veneering Qualities

Suitable for peeling

Steam Bending

Fair to Good Results
Poor
Moderate

Painting

Susceptible to insect attack
Non-resistant to termites
Non-resistant to powder post beetles
Non-resistant to marine borers
Perishable

Polishing

Satisfactory results
Good results

Staining

Finish is generally satisfactory

Strength Properties

Max. crushing strength = high
Density (dry weight) = 53-60
Bending strength (MOR) = high
Hardness (side grain) = medium
Shrinkage, Tangential = large
Density (dry weight) = 46-52 lbs/cu. ft.
Shearing strength (parallel to grain) = medium
Shrinkage, Radial = fairly large
Shrinkage, Tangential = fairly large
Bending strength (MOR) = medium
Shrinkage, Tangential = moderate
Density (dry weight) = 61<
Shearing strength (parallel to grain) = low
Bending strength (MOR) = very low
Shrinkage, Radial = small
Shearing strength (parallel to grain) = high

Numerical Data

Item Green Dry English
Bending Strength 13258 20226 psi
Density 52 lbs/ft3
Hardness 1569 lbs
Impact Strength 28 inches
Maximum Crushing Strength 7048 10119 psi
Shearing Strength 2151 psi
Stiffness 2129 2457 1000 psi
Weight 51 41 lbs/ft3
Radial Shrinkage 5 %
Tangential Shrinkage 9 %
Volumetric Shrinkage 13 %
Item Green Dry Metric
Bending Strength 932 1422 kg/cm2
Density 833 kg/m3
Hardness 711 kg
Impact Strength 71 cm
Maximum Crushing Strength 495 711 kg/cm2
Shearing Strength 151 kg/cm2
Stiffness 149 172 1000 kg/cm2
Weight 817 657 kg/m3
Radial Shrinkage 5 %
Tangential Shrinkage 9 %

References
Anderson, R.H.,1947,The Trees of New South Wales,New South Wales Department of Agriculture

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

Banks, 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.48

Banks, 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]

Berni, C.A., Bolza, E., Christensen, F.J.,1979,South American Timbers – The Characteristics, Properties and Uses of 190,Species,C.S.I.R.O Div. Building Research

Bolza, E., Keating, W.G.,1972,African Timbers – the Properties, Uses and Characteristics of 700 Species,C.S.I.R.O. Div. of Building Research

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.25

Bootle, K.R.,1971,The Commercial Timbers of New South Wales and their use,Angus & Robertson (publishers) PTY Ltd

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

Cause, M.L.; Rudder, E.J. and Kynaston, W.T.,1989,Queensland Timbers Their Nomenclature, Density, and Lyctid Susceptability,Queensland Department of Forestry, Technical Pamplet No.2

Cause, M.L., Et al,1974,The Nomenclature, Density and Lyctus – Susceptibility of Queensland,Timbers,Queensland Forestry Department Pamphlet 13

Clifford, N.,1953,Commercial Hardwoods – Their Characteristics Identification and,Utilization,Sir Isaac Pitman & Sons Ltd. London

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

Farmer, R.H.,1972,Handbook of Hardwoods,HMSO

Forestry Commission of New South Wales,1987,Timbers used in New South Wales for Domestic Buildings,Forestry Commission of New South Wales, Technical Publication No.6

Fouarge, J.,1970,Essais Physiques,Mecaniques et de Durabilite de Bois de la Republique,Democratique du Congo,I.N.E.A.C. Belgium Serie Technique,No.76

Gay, 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.277

Hall, N., Et al,1970,Forest Trees of Australia,Australian Government Publishing Service, Canberra

Haslett, A.N.,1990,Properties and utilisation of exotic speciality timbers grown in New,Zealand Part VI: Eastern Blue Gums and Stringy Barks Eucalyptus,botryoides, E.saligna, E.globoidea, E.muellerana, E.pilaruis,New Zealand Forest Service, Forest Research Institute, FRI Bulletin No.119

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

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.13

Kloot, N.H., Bolza, E.,1961,Properties of Timbers Imported into Australia,C.S.I.R.O. Forest Products Division Technological Paper,No.12

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)

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

Rendle, B.J.,1969,World Timbers (3 Vols.,Ernest Benn Ltd. London

Reyes, L.J.,1938,Philippine Woods,Commonwealth of the Philippines Department of Agriculture and Commerce,Technical Bulletin,No.7

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Scott, 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.1

Skolmen, R.G.,1974,Some woods of Hawaii, properties and uses of 16 commercial species,U.S.A. Department of Agriculture, Forest Service, Pacific Southwest Forest,and Range Experiment Station, General Technical Report PSW_8

Streets, R.J.,1962,Exotic Forest Trees in the British Commonwealth,Clarendon Press Oxford

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