Black tupelo
Nyssa sylvatica
Black tupelo measures 810 lbf on the Janka scale, 37% softer than northern red oak.
- Across all 155 woods it falls in the bottom fifth for bending strength and stiffness.
- On the Janka scale its nearest neighbours are mahogany at 800 lbf and African mahogany at 830 lbf.
U.S. hardwoodsU.S. softwoodsImported woodsNorthern red oak
Six measures
Black tupeloU.S. hardwoods medianOther woods
Stiffness
1.20 M psi8.3 GPa19th most flexible of 15525% below the U.S. hardwoods median0.54 M psi4.06 M psiBending strength
9,600 psi66.2 MPa31st weakest of 15526% below the U.S. hardwoods median4,300 psi29,900 psiShrinkage across the face
8.7%radial 5.1%50th highest of 1553.5%12.7%Density
0.460.50 at 12% MC58th lightest of 1550.250.96Janka hardness
810 lbf3,603 N64th softest of 15542nd of 53 U.S. hardwoods; 30% below the U.S. hardwoods median240 lbf3,680 lbfCupping tendency
1.7164th lowest of 1551.092.90
For its weight: stiffness-to-weight 2.61 (145th of 155); strength-to-weight 20,870 psi (148th of 155).
How much it moves
Both its face shrinkage (8.7%) and its T/R ratio (1.71) sit in the middle half of the list.
0.52 in.
off a 6-inch flatsawn board, green to oven-dry; quartersawn 0.31 in.
- Tangential
- 8.7%
- Radial
- 5.1%
- Volume
- 14.4%
- T/R ratio
- 1.71 (64th most stable of 155)
End view, shrinkage drawn 3× life size.
Closest substitutes
- American sycamore
5% softer · same density · shrinks 0.3 points less across the face
- Hackberry
9% harder · 6% heavier · shrinks 0.2 points more across the face
- Slippery elm
6% harder · 4% heavier · shrinks 0.2 points more across the face
Woods of similar hardness
The eight nearest on the Janka scale, lbf.
Laboratory values
Its most unusual laboratory figure is work to maximum load: 9th lowest of the 142 woods with a published value.
| Property | Green | Dry, 12% MC | Change when dried | Metric, 12% MC |
|---|---|---|---|---|
| Work to maximum load | 8.00in-lbf/in³ | 6.20in-lbf/in³ | −22% | 42.7kJ/m³ |
| Modulus of elasticity | 1.03M psi | 1.20M psi | +17% | 8.27GPa |
| Modulus of rupture | 7,000psi | 9,600psi | +37% | 66.2MPa |
| Impact bending | 30in. | 22in. | −27% | 559mm |
| Compression parallel to grain | 3,040psi | 5,520psi | +82% | 38.1MPa |
| Compression perpendicular | 480psi | 930psi | +94% | 6.40MPa |
| Shear parallel to grain | 1,100psi | 1,340psi | +22% | 9.20MPa |
| Side hardness | 640lbf | 810lbf | +27% | 3,603N |
| Tension perpendicular | 570psi | 500psi | −12% | 3.40MPa |
Wood Handbook Table 5-3b, Table 4-3. Data & method · Guides