The following data was compiled from industry-recognized tests conducted by the U.S. Forest Products Laboratory:
|
|
Western Alder |
Bigleaf Maple |
Western Red Oak |
Pacific Madrone |
Tanoak |
Oregon White Oak |
Golden Chestnut |
Northern Poplar |
Oregon Ash |
Sycamore |
California Black Walnut |
Western Birch |
|
Machining |
9 |
8 |
9 |
10 |
8 |
7 |
6 |
4 |
7 |
7 |
9 |
9 |
|
Resistance to Splitting |
8 |
8 |
9 |
9 |
9 |
8 |
7 |
6 |
8 |
7 |
6 |
7 |
|
Joint Strength |
9 |
8 |
8 |
8 |
9 |
9 |
7 |
5 |
7 |
6 |
6 |
8 |
|
Gluing |
10 |
8 |
8 |
8 |
7 |
7 |
8 |
6 |
7 |
6 |
7 |
9 |
|
Sanding/Polishing |
10 |
8 |
9 |
9 |
8 |
8 |
8 |
4 |
7 |
5 |
9 |
9 |
|
Finishing |
10 |
8 |
9 |
6 |
8 |
7 |
8 |
4 |
8 |
5 |
8 |
8 |
|
Specific Gravity |
.41 |
.48 |
.57 |
.65 |
.66 |
.72 |
.46 |
.35 |
.55 |
.49 |
.55 |
.60 |
|
Weight Per Cubic Foot |
28.7 |
33.6 |
39.8 |
45.4 |
46.1 |
50.3 |
32.2 |
24.5 |
38.4 |
34.3 |
38.4 |
32 |
|
Weight per MBF |
2390 |
2850 |
3320 |
3785 |
3930 |
4190 |
2680 |
2040 |
3200 |
2850 |
3200 |
3250 |
|
Hardness |
5 |
5 |
8 |
10 |
9 |
9 |
6 |
3 |
8 |
6 |
7 |
7 |
|
Shrinkage Volume (%) |
12.6 |
11.6 |
9.7 |
17.4 |
14.9 |
13.4 |
13.2 |
12.4 |
13.2 |
14.1 |
12.8 |
11.5 |
|
Static Bending |
6 |
7 |
6 |
6 |
10 |
6 |
7 |
4 |
9 |
7 |
9 |
8 |
|
Impact Bending |
5 |
6 |
5 |
6 |
8 |
6 |
7 |
4 |
8 |
9 |
8 |
6 |
|
Compression |
6 |
6 |
8 |
8 |
8 |
9 |
5 |
3 |
7 |
5 |
6 |
7 |
|
Dimensional Stability |
8 |
8 |
9 |
5 |
7 |
8 |
7 |
5 |
7 |
6 |
9 |
8 |
Values obtained from consideration of USDA Forest Products Lab, Oregon State University Forest Research Lab, Pittsburgh Testing Lab and years of practical applications.
Machining - Average of 5 operations: Planing, shaping, turning, boring and mortising (High of 10).
Resistance To Splitting - Resistance to splitting from nail or screw (High of 10).
Joint Strength - Average of side and end grain screw holding ability measured in shear factor and converted for comparison (High of 10).
Gluing - Total Bond Strength (High of 10).
Sanding/Polishing - Resistance to fuzzing (High of 10).
Finishing - Ability to absorb stain evenly, take oil and water based finishes without bleaching (High of 10).
Specific Gravity - Green volume, oven dry weight.
Weight Per Cubic Foot - Lbs at 12% moisture content.
Weight per MBF - Lbs per 1000 board feet at 12% moisture content, 4/4 rough.
Hardness - Pressure to bury half of 1.13cm ball perpendicular to the grain (High of 10).
Shrinkage Volume - Percent of across grain shrinkage from green to 6% moisture content.
Static Bending - Resistance to rupture (High of 10).
Impact Bending - Resistance to fiber stress (High of 10).
Compression - Crushing strength, resistance to weight applied parallel to grain (High of 10).
Dimensional Stability - Resistance to expansion and contraction due to climatic variations
(High of 10).
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