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 | % |
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