C27 vs C35

C35 is 1.1 times as stiff as C27. It is 1.1 times as dense. Per unit mass they are about equally stiff (26.74 and 27.66 MJ/kg). Strength: f_m,k = 27 MPa for C27, f_m,k = 35 MPa for C35.

C27 EN 338:2016 C35 EN 338:2016

Side by side

ratio = C35 / C27 · log scale

Property	C27	C35	Unit	Ratio
E₁ Modulus, direction 1	11.5	13	GPa	1.13×
E₂ Modulus, direction 2	0.38	0.43	GPa	1.13×
E₃ Modulus, direction 3	0.38	0.43	GPa	1.13×
G₁₂ Shear modulus 1-2	0.72	0.81	GPa	1.12×
G₁₃ Shear modulus 1-3	0.72	0.81	GPa	1.12×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	7.7	8.7	GPa	1.13×
ρ Density	430	470	kg/m³	1.09×
ρ_k Density, characteristic (5 % fractile)	360	390	kg/m³	1.08×
f_m,k Bending strength	27	35	MPa	1.3×
f_t,0,k Tension parallel to grain	16.5	22.5	MPa	1.36×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	22	25	MPa	1.14×
f_c,90,k Compression perpendicular to grain	2.5	2.7	MPa	1.08×
f_v,k Shear strength	4	4	MPa	1×
E/ρ Specific stiffness E/ρ · derived	26.74	27.66	MJ/kg	1.03×
c₀ Bar wave speed √(E/ρ) · derived	5171	5259	m/s	1.02×
f/ρ Specific strength f/ρ · derived	62.79	74.47	kJ/kg	1.19×

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.