C27 vs C45

C45 is 1.3 times as stiff as C27. It is 1.1 times as dense. Per unit mass C45 is 1.1 times as stiff. Strength: f_m,k = 27 MPa for C27, f_m,k = 45 MPa for C45.

C27 EN 338:2016 C45 EN 338:2016

Side by side

ratio = C45 / C27 · log scale

Property	C27	C45	Unit	Ratio
E₁ Modulus, direction 1	11.5	15	GPa	1.3×
E₂ Modulus, direction 2	0.38	0.5	GPa	1.32×
E₃ Modulus, direction 3	0.38	0.5	GPa	1.32×
G₁₂ Shear modulus 1-2	0.72	0.94	GPa	1.31×
G₁₃ Shear modulus 1-3	0.72	0.94	GPa	1.31×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	7.7	10.1	GPa	1.31×
ρ Density	430	490	kg/m³	1.14×
ρ_k Density, characteristic (5 % fractile)	360	410	kg/m³	1.14×
f_m,k Bending strength	27	45	MPa	1.67×
f_t,0,k Tension parallel to grain	16.5	30	MPa	1.82×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	22	29	MPa	1.32×
f_c,90,k Compression perpendicular to grain	2.5	2.9	MPa	1.16×
f_v,k Shear strength	4	4	MPa	1×
E/ρ Specific stiffness E/ρ · derived	26.74	30.61	MJ/kg	1.14×
c₀ Bar wave speed √(E/ρ) · derived	5171	5533	m/s	1.07×
f/ρ Specific strength f/ρ · derived	62.79	91.84	kJ/kg	1.46×

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.