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Maple

Maple (Acer spp.) contains about 120 species native to Asia [16], North America [13],
Mexico and Guatemala [1], and the European/Mediterranean region [6], with the rest in Eurasia, Malaysia and northern Africa. The Maples can be separated into two groups based on the ray widths of their microscopic anatomy, the soft maple group and the hard maple group. Species within each group look alike microscopically. Acer is the classical Latin name of maple.
  • Acer barbatum- hammock maple, Florida maple, southern sugar maple, sugar maple
  • Acer circinatum- vine maple, mountain maple
  • Acer glabrum-bark maple, California mountain maple, Douglas maple, dwarf maple, mountain maple, New Mexico maple, rocky mountain maple, shrubby maple, sierra maple, soft maple
  • Acer grandidentatum- bigtooth maple, canyon maple, hard maple, large-toothed maple, sugar maple, ultravioletalde bigtooth maple, western sugar maple
  • Acer leucoderm-chalk maple, palebark maple, sugar maple, whitebark maple
  • Acer macrophyllum*- big-leaf, bigleaf maple, broadleaf maple, broadleaved maple, bugleaf maple, Californian maple, Oregon maple, pacific maple, white maple
  • Acer negundo*-?ash maple, ashleaf maple, black ash, boxelder, boxelder maple, California boxelder, cut-leaved maple, inland boxelder, manitoba maple, negundo maple, red river maple, stinking ash, sugar ash, three-leaved maple, western boxelder
  • Acer nigrum*- black maple, black sugar maple, hard maple, rock maple, sugar maple, white maple
  • Acer pennsylvaticum- buckwood, goose-foot maple, moosewood, mountain alder, northern maple, Pennsylvanian maple, striped dogwood, striped maple, whistlewood
  • Acer rubrum*-?Carolina red maple, drummond maple, drummond red maple, Oregon maple, red maple, scarlet maple, shoe-peg maple, silver maple, soft maple, southern soft maple, swamp maple, three-pointed-leaf maple, three-toothed red maple, water maple, white maple
  • Acer saccharinum*- creek maple, papascowood, river maple, silver maple, silverleaf maple, soft maple, swamp maple, water maple, white maple
  • Acer saccharum*- bird's-eye maple, black maple, curly maple, hard maple, rock maple, rough maple, sugar, sugar maple, sugar-tree, sweet maple, thumb-nail maple
  • Acer spicatum-?goose-foot maple, low maple, moose maple, mountain maple, mountain maple-bush, spiked maple, water maple

*commercial species

Distribution
Throughout most of North America, with commercial species in the eastern United States and Canada and the western coast of the United States (bigleaf maple).

The Tree
Maples grow to heights of 120 ft (36 m), with a diameter of 3 ft (1 m). Forest grown trees may have a clear bole of 60 ft (18 m).

The Wood

General
Maple lumber comes principally from the Middle Atlantic and Lake States, which together account for about two-thirds of the production. The wood of sugar maple and black maple is known as hard maple; that of silver maple, red maple, and boxelder as soft maple. The sapwood of the maples is commonly white with a slight reddish-brown tinge; the heartwood is light reddish brown, but sometimes is considerably darker. The sapwood is from 3 to 5+ inches (76 to 127+ mm) thick.

Hard maple has a fine, uniform texture, turns well on a lathe, is resistant to abrasion and has no characteristic odor or taste. It is heavy, strong, stiff, hard, and resistant to shock, and it has large shrinkage. Sugar maple is generally straight grained but the grain also occurs as "birds-eye," "curly," and "fiddleback" grain.

The wood of soft maples resembles that of hard maples but is not as heavy, hard and strong, the better grade of soft maple has been substituted for hard maple in furniture. The sapwood in the soft maples is considerably wider than that in the hard maples and has a lighter heartwood color.

Maple lumber sometimes has olive or greenish black discolored areas known as mineral streak or mineral stain, which may be due to injury. Maple wood stains well and takes a high polish. It is intermediate in gluing and has low decay resistance.

Mechanical Properties (2-inch standard)

Compression
Specific

gravity

MOE

X106 lbf/in2

MOR

lbf/in2

Parallel

lbf/in2

Perpendicular

lbf/in2

WMLa

in-lbf/in3

Hardness

lbf

Shear

lbf/in2

Acer macrophyllum (bigleaf maple)
Green 0.44 1.1 7,400 3,240 450 8.7 620 1,110
Dry 0.48 1.45 10,700 5,950 750 7.8 850 1,730
Acer nigrum (black maple)
Green 0.52 1.33 7,900 3,270 600 12.8 840 1,130
Dry 0.57 1.62 1,330 6,680 1,020 12.5 1,180 1,820
Acer pennsylvaticum (striped maple)
Green 0.44 - - - - - - -
Dry 0.46 - - - - - - -
Acer rubrum (red maple)
Green 0.49 1.39 7,700 3,280 400 11.4 700 1,150
Dry 0.54 1.64 13,400 6,540 1,000 12.5 950 1,850
Acer saccharinum (silver maple)
Green 0.44 0.94 5,800 2,490 370 11.0 590 1,050
Dry 0.47 1.14 8,900 5,220 740 8.3 700 1,480
Acer saccharum (silver maple)
Green 0.56 1.55 9,400 4,020 640 13.3 970 1,460
Dry 0.63 1.83 15,800 7,830 1,470 16.5 1,450 2,330
aWML = Work to maximum load.
bReference (98).
cReference (59).

Kiln Drying Schedulesa

Condition 4/4,5/4,6/4 stock 8/4 stock 10/4 stock 12/4 stock 16/4 stock
Soft maplesb
NA
Hard maplesc

 Drying and Shrinkage

Type of shrinkage Percentage of shrinkage
(green to final moisture content)
0% MC 6% MC 20% MC
Acer macrophyllum (bigleaf maple)
Tangential 7.1 5.7 2.4
Radial 3.7 3.0 1.2
Volumetric 11.6 9.3 3.9
Acer nigrum (black maple)
Tangential 9.3 7.4 3.1
Radial 4.8 3.8 1.6
Volumetric 14.0 11.2 4.7
Acer pennsylvaticum (striped maple)
Tangential 8.6 - -
Radial 43.2 - -
Volumetric 12.3 - -
Acer rubrum (red maple)
Tangential 8.2 6.6 2.7
Radial 4.0 3.2 1.3
Volumetric 12.6 10.5 4.4
Acer saccharinum (silver maple)
Tangential 7.2 5.8 2.4
Radial 3.0 2.4 1.0
Volumetric 12.0 9.6 4.0
Acer saccharum (silver maple)
Tangential 9.9 7.6 3.2
Radial 4.8 3.9 1.6
Volumetric 14.7 11.9 5.0
aBirch shrinks considerably during drying. References: 0% MC (98),
6% and 20% MC (90).

Working Properties: The wood turns well, is harder to work than softer woods, and has high nail-holding ability. It stains and polishes well, but is intermediate in gluing.

Durability: Rated as slightly or nonresistant to heartwood decay.

Preservation: Moderately resistant to penetration with preservatives.

Uses:  Lumber, distillation, veneer, crossties, paper pulp, flooring, furniture, pallets, boxes and crates, shoe lasts, handles, woodenware, novelties, spools and bobbins, bowling alleys, dance floors, piano frames, bowling pins, cutting blocks, pulpwood and turnery.

Toxicity: May cause allergic bronchial asthma, dermatitis and rhinitis (40).

Source: US Forest Service


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Updated 10/12/2016 12:31:37 PM