C14 vs C30

C30 is 1.7 times as stiff as C14. It is 1.3 times as dense. Per unit mass C30 is 1.3 times as stiff. Strength: f_m,k = 14 MPa for C14, f_m,k = 30 MPa for C30.

C14 EN 338:2016 C30 EN 338:2016

Side by side

ratio = C30 / C14 · log scale

Property	C14	C30	Unit	Ratio
E₁ Modulus, direction 1	7	12	GPa	1.71×
E₂ Modulus, direction 2	0.23	0.4	GPa	1.74×
E₃ Modulus, direction 3	0.23	0.4	GPa	1.74×
G₁₂ Shear modulus 1-2	0.44	0.75	GPa	1.7×
G₁₃ Shear modulus 1-3	0.44	0.75	GPa	1.7×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	4.7	8	GPa	1.7×
ρ Density	350	460	kg/m³	1.31×
ρ_k Density, characteristic (5 % fractile)	290	380	kg/m³	1.31×
f_m,k Bending strength	14	30	MPa	2.14×
f_t,0,k Tension parallel to grain	7.2	19	MPa	2.64×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	16	24	MPa	1.5×
f_c,90,k Compression perpendicular to grain	2	2.7	MPa	1.35×
f_v,k Shear strength	3	4	MPa	1.33×
E/ρ Specific stiffness E/ρ · derived	20	26.09	MJ/kg	1.3×
c₀ Bar wave speed √(E/ρ) · derived	4472	5108	m/s	1.14×
f/ρ Specific strength f/ρ · derived	40	65.22	kJ/kg	1.63×

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.