C45 vs C50

C50 and C45 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (30.61 and 30.77 MJ/kg). Strength: f_m,k = 45 MPa for C45, f_m,k = 50 MPa for C50.

C45 EN 338:2016 C50 EN 338:2016

Side by side

ratio = C50 / C45 · log scale

Property	C45	C50	Unit	Ratio
E₁ Modulus, direction 1	15	16	GPa	1.07×
E₂ Modulus, direction 2	0.5	0.53	GPa	1.06×
E₃ Modulus, direction 3	0.5	0.53	GPa	1.06×
G₁₂ Shear modulus 1-2	0.94	1	GPa	1.06×
G₁₃ Shear modulus 1-3	0.94	1	GPa	1.06×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	10.1	10.7	GPa	1.06×
ρ Density	490	520	kg/m³	1.06×
ρ_k Density, characteristic (5 % fractile)	410	430	kg/m³	1.05×
f_m,k Bending strength	45	50	MPa	1.11×
f_t,0,k Tension parallel to grain	30	33.5	MPa	1.12×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	29	30	MPa	1.03×
f_c,90,k Compression perpendicular to grain	2.9	3	MPa	1.03×
f_v,k Shear strength	4	4	MPa	1×
E/ρ Specific stiffness E/ρ · derived	30.61	30.77	MJ/kg	1.01×
c₀ Bar wave speed √(E/ρ) · derived	5533	5547	m/s	1×
f/ρ Specific strength f/ρ · derived	91.84	96.15	kJ/kg	1.05×

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.