Fraxinus pennsylvanica (Green ash)


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Scientific Name
Fraxinus pennsylvanica

Trade Name
Green ash

Family Name
Oleaceae

Common Names
American ash, Ash, Blue ash, Darlington ash, Fresno, Green ash, Pumpkin ash, Red ash, Swamp ash, Water ash, Water ash profunda, White ash

Regions of Distribution
North America

Countries of Distribution  [VIEW MAP]
Canada, United States

Common Uses
Agricultural implements, Baseball bats, Baskets, Bedroom suites, Beehives, Bent Parts, Boat building (general), Boat building: framing, Boxes and crates, Building materials, Cabinetmaking, Chairs, Cooperages, Decorative plywood, Decorative veneer, Dining-room furniture, Drawer sides, Excelsior, Figured veneer, Fine furniture, Food containers, Fuelwood, Furniture , Furniture, Handles, Handles: general, Hockey sticks, Interior construction, Joinery, Kitchen cabinets, Living-room suites, Oars, Office furniture, Paddles, Paneling , Plywood, Radio – stereo – TV cabinets, Railroad cars, Railroad ties, Shafts/Handles, Skis, Sporting Goods, Tables, Tool handles, Toys, Utility furniture, Vehicle parts, Veneer, Wainscotting

Environmental Profile

Widespread
May be rare in some parts of its range
Globally secure
Data source is Nature Conservancy
Abundant

Distribution Overview

Green ash is the most widely distributed of all the American ashes. Its range extends from Cape Breton Island and Nova Scotia to southeastern Alberta and Montana, and southward to central Texas and northern Florida

Heartwood Color

Brown
Yellow
Orange
Brown
Greenish to greyish
Yellowish brown
Yellow to golden-yellow to orange
Light brown
Dark brown

Very similar to white ash

Sapwood Color

White
Yellow
White to yellow
Well defined
Paler than heartwood

Grain

Straight
Figure
Even
Growth rings (figure)

 

Straight
Clear growth rings (figure)

Texture

Medium
Coarse

Luster

Somewhat lustrous
Lustrous

Natural Durability

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

Heartwood resistance to attack by decay fungi and other wood destroying organisms is very low or negligible.

Odor

No specific smell or taste

Kiln Schedules

T8 – B4 (4/4); T5 – B3 (8/4) US
Drying (speed) is fast

Drying Defects

Checking
Distortion
Existing shakes may open up
End splitting
Distortion (twist/warp) is likely

Slow drying of timber produced from trees from wet sites may cause gray-brown sapwood stains (sticker marks, stains), and surface checks (in 6/4 and thicker stock)

Ease of Drying

Fairly Easy
Easy
Dries rapidly with little degrade

Kiln Drying Rate

Rapid
Drying rate is fairly rapid to fast

Tree Size

Bole length is 10-20 m
Sapwood width is 5-10 cm
Bole length is 20-30 m
Tree height is 10-20 m
Tree height is 20-30 m
Tree height is 30-40 m

Product Sources
Green ash has very similar properties to White ash, and lumber and veneer produced from the two species are often mixed together and maketed without distinction.

Blunting Effect

Cuting edges are dulled moderately

Boring

Fairly easy to very easy
Very good results

Cutting Resistance

Easy to saw

Gluing

Fair gluing properties
Easy to glue

Mortising

Responds readily to mortising

Movement in Service

Stable
Small

The timber is dimensionally stable after seasoning, with only small movement in use

Nailing

Fairly Difficult to Very Difficult
Very Good to Excellent Results
Fair to Good Results
Pre-boring recommended
Holds nails well

Planing

Difficult to plane

Resistance to Impregnation

Permeable sapwood
Resistant heartwood
Resistant sapwood
Good response to preservative treatment

Response to Hand Tools

Easy to Work
Easy to machine
Good response to hand tools

Sanding

Sanding is fairly difficult

Screwing

Screwing yields good results
Possible if prebored

Turning

Fairly Easy to Very Easy
Very Good to Excellent Results
Fair to Good Results
Difficult to turn

Veneering Qualities

There is slight to moderate drying degrade and the potential for buckles and splits
Moderately easy to veneer

Steam Bending

Very good
Satisfactory

Painting

Satisfactory results

Polishing

Very good

Staining

Stains well

Varnishing

Good results

Strength Properties

Shearing strength (parallel to grain) = medium
Max. crushing strength = medium
Bending strength (MOR) = medium
Hardness (side grain) = soft
Density (dry weight) = 38-45 lbs/cu. ft.
Modulus of Elasticity (stiffness) = low
Toughness-Hammer drop (Impact Strength) = medium
Shearing strength (parallel to grain) = low
Toughness-Hammer drop (Impact Strength) = low
Shrinkage, Tangential = moderate
Shrinkage, Radial = moderate
Shearing strength (parallel to grain) = very low
Max. crushing strength = low
Max. crushing strength (stiffness) = very low
Density (dry weight) = 53-60 lbs/cu. ft
Density (dry weight) = 31-37 lbs/cu. ft.
Bending strength (MOR) = low

Numerical Data

Item Green Dry English
Bending Strength 8117 12643 psi
Crushing Strength 622 1196 psi
Density 41 lbs/ft3
Hardness 995 lbs
Impact Strength 36 34 inches
Maximum Crushing Strength 3438 5928 psi
Shearing Strength 1931 psi
Static Bending 2156 3822 psi
Stiffness 1225 1407 1000 psi
Work to Maximum Load 10 11 inch-lbs/in3
Specific Gravity 0.46 0.5
Weight 39 37 lbs/ft3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %
Volumetric Shrinkage 11 %
Item Green Dry Metric
Bending Strength 570 888 kg/cm2
Crushing Strength 43 84 kg/cm2
Density 657 kg/m3
Hardness 451 kg
Impact Strength 91 86 cm
Maximum Crushing Strength 241 416 kg/cm2
Shearing Strength 135 kg/cm2
Static Bending 151 268 kg/cm2
Stiffness 86 98 1000 kg/cm2
Work to Maximum Load 0.70 0.77 cm-kg/cm3
Specific Gravity 0.46 0.5
Weight 624 592 kg/m3
Radial Shrinkage 3 %
Tangential Shrinkage 6 %

References
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

Betts, H.S.,1945,American Woods – Ash,USDA, Forest Service American Woods

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, 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

California Department of Forestry. Comparative Physical & Mechanical Properties of Western & Eastern Hardwoods. Prepared by Forest Products Laboratory, University of California at Berkeley, Berkeley, California. n/d.

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

HMSO, 1981. Handbook of Hardwoods, 2nd Edition. Revised by R.H. Farmer. Department of the Environment, Building Research Establishment, Princes Risborough Laboratory, Princes Risborough, Aylesbury, Buckinghamshire

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

Kaiser, Jo-ann. Wood of the Month. Ash – A Big Leaguer’s Choice. Wood and Wood Products, September, 1987. Page 40.

Kaiser, Jo-Ann. Wood of the Month. Wood & Wood Products, July 1986 to September 1993.

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

Little, E.L. 1980. The Audubon Society Field Guide to North American Trees – Eastern 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

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

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 Operators Manual, Preliminary Copy. Forest Service, Forest Products Laboratory, Madison, Wisconsin.