ตารางการหดตัวของไม้ชนิดต่างๆ Wood Shrinkage Table  
The following table presents average shrinkage values, from green to ovendry, for a number of commercially important woods. The values are expressed as a percentage of the green dimension for radial, tangential, and tangential to radial (T/R) shrinkage.
Source: U.S. Forest Products Laboratory
ตารางข้างล่างแสดงการหดตัวเฉลี่ยของไม้ชนิดต่างๆจากไม้สดจนถึงไม้ที่อบแห้ง โดยตัวเลขที่แสดงจะระบุเป็นเปอร์เซนต์ของการหดตัวตามรัศมี (Radial) ตามเส้นสัมผัส(Tangential) และในช่องสุดท้ายจะเป็นอัตราส่วนของการหดตัวทั้ง2แนว
|
|
|
Wood Species
|
% Radial Shrinkage
|
% Tangential Shrinkage
|
Tangential/ Radial
|
|
|
|
U. S. Hardwoods
|
|
Alder, Red
|
4.4
|
7.3
|
1.7
|
|
Ash, Black
|
5.0
|
7.8
|
1.6
|
|
Ash, Blue
|
3.9
|
6.5
|
1.7
|
|
Ash, Green
|
4.6
|
7.1
|
1.5
|
|
Ash, Oregon
|
4.1
|
8.1
|
2.0
|
|
Ash, White
|
4.9
|
7.8
|
1.6
|
|
Aspen, Bigtooth
|
3.3
|
7.9
|
2.4
|
|
Aspen, Quaking
|
3.5
|
6.7
|
1.9
|
|
Basswood
|
6.6
|
9.3
|
1.4
|
|
Beech, American
|
5.5
|
11.9
|
2.2
|
|
Birch, Alaska Paper
|
6.5
|
9.9
|
1.5
|
|
Birch, Paper
|
6.3
|
8.6
|
1.4
|
|
Birch, River
|
4.7
|
9.2
|
2.0
|
|
Birch, Sweet
|
6.5
|
9.0
|
1.4
|
|
Birch, Yellow
|
7.3
|
9.5
|
1.3
|
|
Buckeye, Yellow
|
3.6
|
8.1
|
2.3
|
|
Butternut
|
3.4
|
6.4
|
1.9
|
|
California-laurel
|
3.0
|
9.0
|
3.0
|
|
Catalpa, Northern
|
2.0
|
5.0
|
2.5
|
|
Cherry, Black
|
3.7
|
7.1
|
1.9
|
|
Chestnut, American
|
3.4
|
6.7
|
2.0
|
|
Cottonwood, Balsam Poplar
|
3.0
|
7.1
|
2.4
|
|
Cottonwood, Black
|
3.6
|
8.6
|
2.4
|
|
Cottonwood, Eastern
|
3.9
|
9.2
|
2.4
|
|
Dogwood, Flowering
|
7.0
|
12.0
|
1.7
|
|
Elm, American
|
4.2
|
9.5
|
2.3
|
|
Elm, Cedar
|
4.7
|
10.2
|
2.2
|
|
Elm, Rock
|
4.8
|
8.1
|
1.7
|
|
Elm, Slippery
|
4.9
|
8.9
|
1.8
|
|
Elm, Winged
|
5.3
|
11.6
|
2.2
|
|
Hackberry
|
4.8
|
8.9
|
1.9
|
|
Hickory, Pecan
|
4.9
|
8.9
|
1.8
|
|
Hickory, Mockernut
|
7.7
|
11.0
|
1.4
|
|
Hickory, Pignut
|
7.2
|
11.5
|
1.6
|
|
Hickory, Shagbark
|
7.0
|
10.5
|
1.5
|
|
Hickory, Shellbark
|
7.6
|
12.6
|
1.7
|
|
Holly, American
|
4.8
|
9.9
|
2.1
|
|
Honeylocust
|
4.2
|
6.6
|
1.6
|
|
Hophornbeam
|
9.0
|
10.0
|
1.1
|
|
Horse Chestnut
|
2.0
|
3.0
|
1.5
|
|
Locust, Black
|
4.6
|
7.2
|
1.6
|
|
Madrone, Pacific
|
5.6
|
12.4
|
2.2
|
|
Magnolia, Cucumbertree
|
5.2
|
8.8
|
1.7
|
|
Magnolia, Southern
|
5.4
|
6.6
|
1.2
|
|
Sweetbay
|
4.7
|
8.3
|
1.8
|
|
Maple, Bigleaf
|
3.7
|
7.1
|
1.9
|
|
Maple, Black
|
4.8
|
9.3
|
1.9
|
|
Maple, Red
|
4.0
|
8.2
|
2.1
|
|
Maple, Silver
|
3.0
|
7.2
|
2.4
|
|
Maple, Striped
|
3.2
|
8.6
|
2.7
|
|
Maple, Sugar
|
4.8
|
9.9
|
2.1
|
|
Mesquite
|
2.2
|
2.6
|
1.1
|
|
Oak, Black
|
4.4
|
11.1
|
2.5
|
|
Oak, Laurel
|
4.0
|
9.9
|
2.5
|
|
Oak, Northern Red
|
4.0
|
8.6
|
2.2
|
|
Oak, Pin
|
4.3
|
9.5
|
2.2
|
|
Oak, Scarlet
|
4.4
|
10.8
|
2.5
|
|
Oak, Southern Red
|
4.7
|
11.3
|
2.4
|
|
Oak, Water
|
4.4
|
9.8
|
2.2
|
|
Oak, Willow
|
5.0
|
9.6
|
1.9
|
|
Oak, Bur
|
4.4
|
8.8
|
2.0
|
|
Oak, Chestnut
|
5.3
|
10.8
|
2.0
|
|
Oak, Live
|
6.6
|
9.5
|
1.4
|
|
Oak, Overcup
|
5.3
|
12.7
|
2.4
|
|
Oak, Post
|
5.4
|
9.8
|
1.8
|
|
Oak, Swamp Chestnut
|
5.2
|
10.8
|
2.1
|
|
Oak, White
|
5.6
|
10.5
|
1.9
|
|
Persimmon,Common
|
7.9
|
11.2
|
1.4
|
|
Sassafras
|
4.0
|
6.2
|
1.6
|
|
Sweetgum
|
5.3
|
10.2
|
1.9
|
|
Sycamore, American
|
5.0
|
8.4
|
1.7
|
|
Tanoak
|
4.9
|
11.7
|
2.4
|
|
Tupelo, Black
|
5.1
|
8.7
|
1.7
|
|
Tupelo, Water
|
4.2
|
7.6
|
1.8
|
|
Walnut, Black
|
5.5
|
7.8
|
1.4
|
|
Willow, Black
|
3.3
|
8.7
|
2.6
|
|
Yellow-poplar
|
4.6
|
8.2
|
1.8
|
|
|
|
|
|
|
U. S. Softwoods
|
|
Baldcypress
|
3.8
|
6.2
|
1.6
|
|
Cedar, Alaska-
|
2.8
|
6.0
|
2.1
|
|
Cedar, Atlantic White
|
2.9
|
5.4
|
1.9
|
|
Cedar, Eastern Redcedar
|
3.1
|
4.7
|
1.5
|
|
Cedar, Incense
|
3.3
|
5.2
|
1.6
|
|
Cedar, Northern White
|
2.2
|
4.9
|
2.2
|
|
Cedar, Port-Orford
|
4.6
|
6.9
|
1.5
|
|
Cedar, Western Redcedar
|
2.4
|
5.0
|
2.1
|
|
Douglas-fir, Coast
|
4.8
|
7.6
|
1.6
|
|
Douglas-fir, Interior North
|
3.8
|
6.9
|
1.8
|
|
Douglas-fir, Interior West
|
4.8
|
7.5
|
1.6
|
|
Fir, Balsam
|
2.9
|
6.9
|
2.4
|
|
Fir, California Red
|
4.5
|
7.9
|
1.8
|
|
Fir, Grand
|
3.4
|
7.5
|
2.2
|
|
Fir, Noble
|
4.3
|
8.3
|
1.9
|
|
Fir, Pacific Silver
|
4.4
|
9.2
|
2.1
|
|
Fir, Subalpine
|
2.6
|
7.4
|
2.8
|
|
Fir, White
|
3.3
|
7.0
|
2.1
|
|
Hemlock, Eastern
|
3.0
|
6.8
|
2.3
|
|
Hemlock,Mountain
|
4.4
|
7.1
|
1.6
|
|
Hemlock,Western
|
4.2
|
7.8
|
1.9
|
|
Larch, Western
|
4.5
|
9.1
|
2.0
|
|
Pine, Eastern White
|
2.1
|
6.1
|
2.9
|
|
Pine, Jack
|
3.7
|
6.6
|
1.8
|
|
Pine, Loblolly
|
4.8
|
7.4
|
1.5
|
|
Pine, Lodgepole
|
4.3
|
6.7
|
1.6
|
|
Pine, Longleaf
|
5.1
|
7.5
|
1.5
|
|
Pine, Pitch
|
4.0
|
7.1
|
1.8
|
|
Pine, Pond
|
5.1
|
7.1
|
1.4
|
|
Pine, Ponderosa
|
3.9
|
6.2
|
1.6
|
|
Pine, Red
|
3.8
|
7.2
|
1.9
|
|
Pine, Shortleaf
|
4.6
|
7.7
|
1.7
|
|
Pine, Slash
|
5.4
|
7.6
|
1.4
|
|
Pine, Sugar
|
2.9
|
5.6
|
1.9
|
|
Pine, Virginia
|
4.2
|
7.2
|
1.7
|
|
Pine, Western White
|
4.1
|
7.4
|
1.8
|
|
Redwood, Old-Growth
|
2.6
|
4.4
|
1.7
|
|
Redwood, Young-Growth
|
2.2
|
4.9
|
2.2
|
|
Spruce, Black
|
4.1
|
6.8
|
1.7
|
|
Spruce, Engelmann
|
3.8
|
7.1
|
1.9
|
|
Spruce, Red
|
3.8
|
7.8
|
2.1
|
|
Spruce, Sitka
|
4.3
|
7.5
|
1.7
|
|
Tamarack
|
3.7
|
7.4
|
2.0
|
|
|
|
|
|
|
Woods Imported into U. S.
|
|
Afrormosia
|
3.0
|
6.4
|
2.1
|
|
Albarco
|
2.8
|
5.4
|
1.9
|
|
Albizia
|
3.0
|
6.0
|
2.0
|
|
Almendrillo
|
5.5
|
8.2
|
1.5
|
|
Andiroba
|
3.1
|
7.6
|
2.5
|
|
Angelin
|
4.6
|
9.8
|
2.1
|
|
Angelique
|
5.2
|
8.8
|
1.7
|
|
Apitong
|
5.2
|
10.9
|
2.1
|
|
Ayan
|
3.0
|
5.0
|
1.7
|
|
Azobe
|
8.4
|
11.0
|
1.3
|
|
Balata
|
6.3
|
9.4
|
1.5
|
|
Balsa
|
3.0
|
7.6
|
2.5
|
|
Banak
|
4.6
|
8.8
|
1.9
|
|
Benge
|
5.2
|
8.6
|
1.7
|
|
Bubinga
|
5.8
|
8.4
|
1.4
|
|
Caribbean
|
6.3
|
7.8
|
1.2
|
|
Cativo
|
2.4
|
5.3
|
2.2
|
|
Cedar, South American
|
4.0
|
6.0
|
1.5
|
|
Ceylon Satinwood
|
6.0
|
7.0
|
1.2
|
|
Cocobolo
|
3.0
|
4.0
|
1.3
|
|
Courbaril
|
4.5
|
8.5
|
1.9
|
|
Cuangare
|
4.2
|
9.4
|
2.2
|
|
Degame
|
5.0
|
9.0
|
1.8
|
|
Determa
|
3.7
|
7.6
|
2.1
|
|
Ebony
|
5.5
|
6.5
|
1.2
|
|
Freijo
|
4.0
|
7.0
|
1.8
|
|
Gmelina
|
2.4
|
4.9
|
2.0
|
|
Greenheart
|
8.8
|
9.6
|
1.1
|
|
Hura
|
2.7
|
4.5
|
1.7
|
|
lpe
|
6.6
|
8.0
|
1.2
|
|
lroko
|
2.8
|
3.8
|
1.4
|
|
Jarrah
|
4.6
|
6.6
|
1.4
|
|
Jelutong
|
2.0
|
4.0
|
2.0
|
|
Kaneelhart
|
5.4
|
7.9
|
1.5
|
|
Kapur
|
4.6
|
10.2
|
2.2
|
|
Karri
|
7.2
|
10.7
|
1.5
|
|
Kempas
|
6.0
|
7.4
|
1.2
|
|
Keruing
|
5.2
|
10.9
|
2.1
|
|
Lauan
|
3.8
|
8.0
|
2.1
|
|
Limba
|
4.5
|
6.2
|
1.4
|
|
Macawood
|
2.7
|
3.5
|
1.3
|
|
Mahogany, African
|
2.5
|
4.5
|
1.8
|
|
Mahogany, True
|
3.0
|
4.1
|
1.4
|
|
Manbarklak
|
5.8
|
10.3
|
1.8
|
|
Manni
|
5.7
|
9.7
|
1.7
|
|
Marishballi
|
7.5
|
11.7
|
1.6
|
|
Merbau
|
2.7
|
4.6
|
1.7
|
|
Mersawa
|
4.0
|
9.0
|
2.3
|
|
Mora
|
6.9
|
9.8
|
1.4
|
|
Obeche
|
3.0
|
5.4
|
1.8
|
|
Ocota
|
4.6
|
7.5
|
1.6
|
|
Okoume
|
4.1
|
6.1
|
1.5
|
|
Opepe
|
4.5
|
8.4
|
1.9
|
|
Parana pine
|
4.0
|
7.9
|
2.0
|
|
Pau Marfim
|
4.6
|
8.8
|
1.9
|
|
Peroba Rosa
|
3.8
|
6.4
|
1.7
|
|
Piquia
|
5.0
|
8.0
|
1.6
|
|
Pilon
|
5.4
|
11.7
|
2.2
|
|
Primavera
|
3.1
|
5.1
|
1.6
|
|
Purpleheart
|
3.2
|
6.1
|
1.9
|
|
Queensland walnut
|
5.0
|
9.0
|
1.8
|
|
Ramin
|
4.3
|
8.7
|
2.0
|
|
Roble (Quercus spp)
|
6.4
|
11.7
|
1.8
|
|
Roble (Tabebuia spp)
|
3.6
|
6.1
|
1.7
|
|
Rosewood, Brazilian
|
2.9
|
4.6
|
1.6
|
|
Rosewood, Indian
|
2.7
|
5.8
|
2.1
|
|
Santa Maria
|
4.6
|
8.0
|
1.7
|
|
Sapele
|
4.6
|
7.4
|
1.6
|
|
Sepetir
|
3.7
|
7.0
|
1.9
|
|
Spanish-cedar
|
4.2
|
6.3
|
1.5
|
|
Teak
|
2.5
|
5.8
|
2.3
|
|
Wallaba
|
3.6
|
6.9
|
1.9
|
|
