C27 vs C30

C30 and C27 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (26.74 and 26.09 MJ/kg). Strength: f_m,k = 27 MPa for C27, f_m,k = 30 MPa for C30.

C27 EN 338:2016 C30 EN 338:2016

Side by side

ratio = C30 / C27 · log scale

Property	C27	C30	Unit	Ratio
E₁ Modulus, direction 1	11.5	12	GPa	1.04×
E₂ Modulus, direction 2	0.38	0.4	GPa	1.05×
E₃ Modulus, direction 3	0.38	0.4	GPa	1.05×
G₁₂ Shear modulus 1-2	0.72	0.75	GPa	1.04×
G₁₃ Shear modulus 1-3	0.72	0.75	GPa	1.04×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	7.7	8	GPa	1.04×
ρ Density	430	460	kg/m³	1.07×
ρ_k Density, characteristic (5 % fractile)	360	380	kg/m³	1.06×
f_m,k Bending strength	27	30	MPa	1.11×
f_t,0,k Tension parallel to grain	16.5	19	MPa	1.15×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	22	24	MPa	1.09×
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	26.09	MJ/kg	0.975×
c₀ Bar wave speed √(E/ρ) · derived	5171	5108	m/s	0.988×
f/ρ Specific strength f/ρ · derived	62.79	65.22	kJ/kg	1.04×

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.