C35 vs C45

C45 is 1.2 times as stiff as C35. Their densities are about the same. Per unit mass C45 is 1.1 times as stiff. Strength: f_m,k = 35 MPa for C35, f_m,k = 45 MPa for C45.

C35 EN 338:2016 C45 EN 338:2016

Side by side

ratio = C45 / C35 · log scale

Property	C35	C45	Unit	Ratio
E₁ Modulus, direction 1	13	15	GPa	1.15×
E₂ Modulus, direction 2	0.43	0.5	GPa	1.16×
E₃ Modulus, direction 3	0.43	0.5	GPa	1.16×
G₁₂ Shear modulus 1-2	0.81	0.94	GPa	1.16×
G₁₃ Shear modulus 1-3	0.81	0.94	GPa	1.16×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	8.7	10.1	GPa	1.16×
ρ Density	470	490	kg/m³	1.04×
ρ_k Density, characteristic (5 % fractile)	390	410	kg/m³	1.05×
f_m,k Bending strength	35	45	MPa	1.29×
f_t,0,k Tension parallel to grain	22.5	30	MPa	1.33×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	25	29	MPa	1.16×
f_c,90,k Compression perpendicular to grain	2.7	2.9	MPa	1.07×
f_v,k Shear strength	4	4	MPa	1×
E/ρ Specific stiffness E/ρ · derived	27.66	30.61	MJ/kg	1.11×
c₀ Bar wave speed √(E/ρ) · derived	5259	5533	m/s	1.05×
f/ρ Specific strength f/ρ · derived	74.47	91.84	kJ/kg	1.23×

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.