C14 vs C45

C45 is about twice as stiff as C14. It is 1.4 times as dense. Per unit mass C45 is 1.5 times as stiff. Strength: f_m,k = 14 MPa for C14, f_m,k = 45 MPa for C45.

C14 EN 338:2016 C45 EN 338:2016

Side by side

ratio = C45 / C14 · log scale

Property	C14	C45	Unit	Ratio
E₁ Modulus, direction 1	7	15	GPa	2.14×
E₂ Modulus, direction 2	0.23	0.5	GPa	2.17×
E₃ Modulus, direction 3	0.23	0.5	GPa	2.17×
G₁₂ Shear modulus 1-2	0.44	0.94	GPa	2.14×
G₁₃ Shear modulus 1-3	0.44	0.94	GPa	2.14×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	4.7	10.1	GPa	2.15×
ρ Density	350	490	kg/m³	1.4×
ρ_k Density, characteristic (5 % fractile)	290	410	kg/m³	1.41×
f_m,k Bending strength	14	45	MPa	3.21×
f_t,0,k Tension parallel to grain	7.2	30	MPa	4.17×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	16	29	MPa	1.81×
f_c,90,k Compression perpendicular to grain	2	2.9	MPa	1.45×
f_v,k Shear strength	3	4	MPa	1.33×
E/ρ Specific stiffness E/ρ · derived	20	30.61	MJ/kg	1.53×
c₀ Bar wave speed √(E/ρ) · derived	4472	5533	m/s	1.24×
f/ρ Specific strength f/ρ · derived	40	91.84	kJ/kg	2.3×

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.