C16 vs C18
C18 is 1.1 times as stiff as C16. Their densities are about the same. Per unit mass C18 is 1.1 times as stiff. Strength: f_m,k = 16 MPa for C16, f_m,k = 18 MPa for C18.
Side by side
ratio = C18 / C16 · log scale| Property | C16 | C18 | Unit | Ratio | ¼×1×4× |
|---|---|---|---|---|---|
| E₁ Modulus, direction 1 | 8 | 9 | GPa | 1.12× | |
| E₂ Modulus, direction 2 | 0.27 | 0.3 | GPa | 1.11× | |
| E₃ Modulus, direction 3 | 0.27 | 0.3 | GPa | 1.11× | |
| G₁₂ Shear modulus 1-2 | 0.5 | 0.56 | GPa | 1.12× | |
| G₁₃ Shear modulus 1-3 | 0.5 | 0.56 | GPa | 1.12× | |
| E₀,₀₅ Modulus parallel to grain, 5 % fractile | 5.4 | 6 | GPa | 1.11× | |
| ρ Density | 370 | 380 | kg/m³ | 1.03× | |
| ρ_k Density, characteristic (5 % fractile) | 310 | 320 | kg/m³ | 1.03× | |
| f_m,k Bending strength | 16 | 18 | MPa | 1.12× | |
| f_t,0,k Tension parallel to grain | 8.5 | 10 | MPa | 1.18× | |
| f_t,90,k Tension perpendicular to grain | 0.4 | 0.4 | MPa | 1× | |
| f_c,0,k Compression parallel to grain | 17 | 18 | MPa | 1.06× | |
| f_c,90,k Compression perpendicular to grain | 2.2 | 2.2 | MPa | 1× | |
| f_v,k Shear strength | 3.2 | 3.4 | MPa | 1.06× | |
| E/ρ Specific stiffness E/ρ · derived | 21.62 | 23.68 | MJ/kg | 1.1× | |
| c₀ Bar wave speed √(E/ρ) · derived | 4650 | 4867 | m/s | 1.05× | |
| f/ρ Specific strength f/ρ · derived | 43.24 | 47.37 | kJ/kg | 1.1× |
Values at the first thickness band or product form of each material (EN 338:2016; EN 338:2016). A minimum and a characteristic value are not the same kind of number — read the ratio as a guide. Each material's page lists every band and every source.