Softwood and Hardwood - Structural Strength Classes
Strength classes, bending stress and mean density of hardwood and softwood
Structural timer is classified according the EU-code in different strength grades - where
- D-Classes - refer to Deciduous Tree Species
- C-Classes - refer to Coniferous Tree Species
Strength classes and structural softwoods and hardwoods physical properties:
Strength Class | Characteristic Minimum Bending Strength - σ - (MPa) | Typical Density - ρ - (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 |
- 1 MPa = 106 Pa
- BS EN 338
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