Populus Tremuloides (Quaking aspen)


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Scientific Name
Populus tremuloides

Trade Name
Quaking aspen

Family Name
Salicaeae

Common Names
Alamo tremblon, Aspe, Aspen, Canadian aspen, Espe, Peuplier tremble, Quaking aspen, Trembling aspen, Zitterpappel

Regions of Distribution
Central America, North America

Countries of Distribution  [VIEW MAP]
Canada, Mexico, United States

Common Uses
Bearings & bushings, Beehives, Boxes and crates, Brooders, Building construction, Cabin construction, Casks, Clothespins, Construction, Cooperages, Core Stock, Decorative veneer, Excelsior, Figured veneer, Flooring, Food containers, Furniture, Jewelry box, Matchboxes, Matches, Musical instruments, Packing cases, Pallets, Particleboard, Plywood, Poultry coops, Pulp/Paper products, Pulpwood, Rough construction, Sporting Goods, Turnery, Veneer

Environmental Profile

Status has not been officially assessed

Distribution Overview
Quaking or Trembling aspen is considered to be the most widely distributed tree in North America. It grows from Alaska to Newfoundland and southward to Virginia. It also occurs in the Rocky Mountains, extending south to southern Arizona and northern New Mexico. It grows from near sea level to an elevation of 6500 to 10,000 feet (1981 to 3048 m) throughout its range. The tree often occurs in pure stands, and grows in many soil types, especially sandy and gravelly slopes.

Heartwood Color

Brown
Red
Pink
Yellow
Green/grey
Purple
Orange
White to cream
Greenish to greyish
Pale brown
Yellowish brown
Brown

Sapwood Color

White
Yellow
Brown
Red
Pink
White to yellow
Same as heartwood
White/Cream
Sapwood blends into heartwood
Paler than heartwood

Grain

Straight
Figure
Even
Growth rings (figure)
Mottled (figure)

 

Straight
Mottled figure
Generally straight, but not always
Clear growth rings (figure)

Texture

Fine
Medium
Uniform
Coarse
Even or uniform
Fine
Fine and uniform

Luster

High
Medium
Low
Silky luster

Natural Durability

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

Odor

Seasoned wood has no odor or taste
No distinctive taste
Green wood has disagreeable smell

Kiln Schedules

UK=E US=T6D2/T3D1 Fr=5
T110 (8/4) US
T109 (4/4) US
T12-E7 (4/4)
T10-E6 (8/4)
Schedule E (4/4) United Kingdom

Wet streaks.
Wet streaks.

Drying Defects

Distortion
Extension of Existing Shakes
Checking
Moderate twist/warp
Moderate collapse and honeycombing
If proper precautions are not taken timber may warp and twist
Expect moderate degrade from water pockets.

Ease of Drying

Moderately Difficult to Difficult
Fairly Easy
Rapidly
Thick Stock Requires Care
Slowly
Moderate
Shrinkage is often moderate
Requires careful piling to prevent distortion
Easy

Kiln Drying Rate

Naturally dries at a moderate speed
Naturally dries quickly

Tree Identification

Bole/stem form is straight

Tree Size

Tree height is 20-30 m
Bole length is 10-20 m
Tree height is 30-40 m
Sapwood width is 0-5 cm
Bole length is 20-30 m
Tree height is 10-20 m
Bark width is 0-5 mm
Sapwood width is 5-10 cm
Trunk diameter is 100-150 cm

Deriving its name from its leaves which are inclined to tremble in the slightest breeze, Trembling or Quaking aspen. The twigs and foliage of the tree are eaten by deer, elk, and moose, as well as sheep and goats. Beavers, rabbits, and other mammals are also reported to feed on the bark, foliage, and buds, and winter buds are a food source for grouse and quails.

Product Sources
Wood produced by Trembling and Bigtooth aspens are difficult to differentiate and are mixed and marketed together under the trade name Aspen.

Comments
General finishing qualities are rated as good

General finishing qualities are rated as satisfactory

Tension wood often present

Blunting Effect

Moderate
Slight
Blunting effect on machining is slight

Boring

Fairly easy to very easy
Fair to good results
Moderately easy
Easy
Bored areas of tension wood tend to rough

Average number of bored pieces reported to produce good to excellent holes = 78).

Carving

Fairly Easy to Very Easy

Cutting Resistance

Fairly Difficult to Very Difficult to saw
Easy to saw
Moderate to saw
Easy to saw

Gluing

Fairly Difficult to Very Difficult
Fair to Good Results
Fairly Easy to Very Easy
Easy to glue
Moderate gluing properties
Good gluing properties

Mortising

Fairly Easy to Very Easy
Satisfactory mortising properties
An average of 60% yield excellent results

Moulding

Fairly Easy to Very Easy
Very poor (an average of 7% yield good results)

Movement in Service

Fair to Good Stability – Medium Movement
Stable
Small
Dimensionally stable after seasoning

Nailing

Holds satisfactorily
Nails hold poorly
Easy to nail
Satisfactory nailing properties
Holds nails well

Planing

Fair to Good Results
Fairly Difficult to Very Difficult
Fairly Easy to Very Easy
Very Good to Excellent Results
Ease of planing is moderate
Requires very sharp and thin cutting angles
On average of 21 pieces out a hundred yield excellent results
Areas of tension wood are difficult to plan and yield fuzzy surfaces

Resistance to Abrasion

Highly resistant to wear

Resistance to Impregnation

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

Resistance to Splitting

Good

Response to Hand Tools

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

Routing & Recessing

Fairly Easy to Very Easy

Sanding

Fairly Easy to Very Easy
Good sanding finish

Screwing

Screwing yields good results
Screwing yields satisfactory results
Satisfactory screwing properties

Turning

Fairly Easy to Very Easy
Very Good to Excellent Results
Fair to Good Results
Good results
Fairly good response (70% yield excellent results)

Veneering Qualities

Suitable for peeling
Veneers easily
Suitable for slicing
Difficult to veneer
Veneers moderately easy
Easy to cut
There is slight to moderate drying degrade and the potential for buckles and splits
Suitable for slicing
Suitable for peeling
Moderately easy to veneer
Converts readily into veneers

Crotches are occasionally available which are used to produce veneers with attractive mottled figure and streaks of pink, orange and golden colors.

Steam Bending

Fair to Good Results
Fairly Easy to Very Easy

Painting

Satisfactory results
Good results

Polishing

Fair to Good Results
Very Good to Excellent Results
Satisfactory results

Staining

Fair to Good Results
Finish is generally satisfactory
Woolly surfaces cause uneven staining
Finish is generally good
Boring, mortising, and other machining properties are generally satisfactory

Strength Properties

Density (dry weight) = 23-30 lbs/cu. ft.
Density = low
Bending strength (MOR) = low
Max. crushing strength = low
Hardness (side grain) = very soft
Modulus of Elasticity (stiffness) = very low
Shrinkage, Radial = small
Max. crushing strength = medium
Bending strength (MOR) = very low
Weight = moderate
Toughness-Hammer drop (Impact Strength) = very low
Toughness-Hammer drop (Impact Strength) = low
Shrinkage, Tangential = moderate
Shrinkage, Tangential = fairly large
Shearing strength (parallel to grain) = very low
Modulus of Elasticity (stiffness) = low
Max. crushing strength (stiffness) = very low
Low resistance to denting and marring
Hardness (side grain) = soft
Density = medium
Crushing strength = low
Bending strength (MOR) = medium

Shearing strength (parallel to grain) = medium

Numerical Data

Item Green Dry English
Bending Strength 5300 8483 psi
Crushing Strength 176 363 psi
Density 26 lbs/ft3
Hardness 337 lbs
Impact Strength 22 21 inches
Maximum Crushing Strength 2282 4263 psi
Shearing Strength 875 psi
Stiffness 983 1239 1000 psi
Work to Maximum Load 5 7 inch-lbs/in3
Specific Gravity 0.33 0.35
Weight 25 21 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 7 %
Volumetric Shrinkage 12 %
Item Green Dry Metric
Bending Strength 372 596 kg/cm2
Crushing Strength 12 25 kg/cm2
Density 416 kg/m3
Hardness 152 kg
Impact Strength 55 53 cm
Maximum Crushing Strength 160 299 kg/cm2
Shearing Strength 61 kg/cm2
Stiffness 69 87 1000 kg/cm2
Work to Maximum Load 0.35 0.49 cm-kg/cm3
Specific Gravity 0.33 0.35
Weight 400 336 kg/m3
Radial Shrinkage 3 %
Tangential Shrinkage 7 %

References
Boone, R.S., C.J. Kozlik, P.J. Bois and E.M. Wengert. 1988. Dry Kiln Schedules for Commercial Woods: Temperate and Tropical. United States Department of Agriculture, Forest Service, Forest Products Laboratory, General Technical Report FPL-GTR-57, Madison, Wisconsin.

Brown, H.P. and Panshin, A.J.,1940,Commercial Timbers of the United States Their structure, identification,,properties and uses,McGraw-Hill, London

Brown, W.H.,1978,Timbers of the World: – No.7 North America,TRADA

Canadian Forestry Service. 1981. Canadian Woods – Their Properties and Uses. Third Edition. E.J. Mullins and T.S. McKnight, Editors. Published by University of Toronto Press, Toronto, Canada.

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

Constantine, Jr., A.J. 1975. Know Your Woods – A Complete Guide to Trees, Woods, and Veneers. Revised by H.J. Hobbs. Charles Scribner’s Sons, New York.

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

Forest Products Research Laboratory, U.K.,1945,A Handbook of Empire Timbers,Department of Scientific and Industrial Research Forest Products Research

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

I.U.F.R.O.,1973,Veneer Species of the World,Assembled at F.P.L. Madison on behalf of I.U.F.R.O. Working Party on,Slicing and Veneer Cutting

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

Laidlaw, W.B.R. 1960. Guide to British Hardwoods. Published by Leonard Hill [Books] Limited, 9 Eden Street, N.W.1, London.

Lincoln, W.A. 1986. World Woods in Color. Linden Publishing Co. Inc. Fresno, California.

Little, E.L. 1980. The Audobon Society Field Guide to North American Trees – Western Region. Published by Arthur A. Knopf, New York.

Markwardt, L.J., Wilson, T.R.C.,1935,Strength and related properties of woods grown in the United States,U.S.A. Department of Agriculture Technical Bulletin,No.479

Mullins, E.J. and McKnight, T.S.,1981,Canadian Woods Their Properties and Uses,University of Toronto Press 3rd Edition

Panshin, A.J. and C. deZeeuw. 1980. Textbook of Wood Technology, 4th Edition. McGraw-Hill Series in Forest Resources. McGraw-Hill Book Company, New York.

Perala, D.A. and Carpenter, E.M.,1985,American Woods – Aspen,USDA, Forest Service American Woods FS-217

Record, S.J., Hess, R.W.,1943,Timbers of the New World,Yale University Press

Takahashi, A.,1978,Compilation of Data on the Mechanical Properties of Foreign Woods (Part,III) Africa,Shimane University, Japan, Research Report on Foreign Wood No. 7

Thomas, A.V.,1953,The timber of Upun Batu (Upuna borneensis,Malaysian Forester 16(3, 163-5

U.S.D.A. Forest Service,1974,Wood Handbook,U.S.A. Department of Agriculture, Forest Service Handbook,72

USDA. 1987. Wood Handbook:Wood as an Engineering Material. Agriculture Handbook No. 72. United States Department of Agriculture, Forest Service, Madison, Wisconsin.

USDA. 1988. Dry Kiln Operator’s Manual – Preliminary Copy. Forest Service, Forest Products Laboratory, Madison, Wisconsin