C14 vs C35

C35 is about twice as stiff as C14. It is 1.3 times as dense. Per unit mass C35 is 1.4 times as stiff. Strength: f_m,k = 14 MPa for C14, f_m,k = 35 MPa for C35.

C14 EN 338:2016 C35 EN 338:2016

Side by side

ratio = C35 / C14 · log scale

Property	C14	C35	Unit	Ratio
E₁ Modulus, direction 1	7	13	GPa	1.86×
E₂ Modulus, direction 2	0.23	0.43	GPa	1.87×
E₃ Modulus, direction 3	0.23	0.43	GPa	1.87×
G₁₂ Shear modulus 1-2	0.44	0.81	GPa	1.84×
G₁₃ Shear modulus 1-3	0.44	0.81	GPa	1.84×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	4.7	8.7	GPa	1.85×
ρ Density	350	470	kg/m³	1.34×
ρ_k Density, characteristic (5 % fractile)	290	390	kg/m³	1.34×
f_m,k Bending strength	14	35	MPa	2.5×
f_t,0,k Tension parallel to grain	7.2	22.5	MPa	3.12×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	16	25	MPa	1.56×
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	27.66	MJ/kg	1.38×
c₀ Bar wave speed √(E/ρ) · derived	4472	5259	m/s	1.18×
f/ρ Specific strength f/ρ · derived	40	74.47	kJ/kg	1.86×

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.