Strength class, bending stress and mean density
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Relationship between strength classes and physical properties for structural softwoods and hardwoods.
| Strength Class | Bending Strength (MPa) | Mean Density (kg/m3) |
| C14 | 14 | 350 |
| C16 | 16 | 370 |
| C18 | 18 | 380 |
| C20 | 20 | 390 |
| C22 | 22 | 410 |
| C24 | 24 | 420 |
| C27 | 27 | 450 |
| C30 | 30 | 460 |
| C35 | 35 | 480 |
| C40 | 40 | 500 |
| C45 | 45 | 520 |
| C50 | 50 | 550 |
| D30 | 30 | 640 |
| D35 | 35 | 670 |
| D40 | 40 | 700 |
| D50 | 50 | 780 |
| D60 | 60 | 840 |
| D70 | 70 | 1080 |
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