C24 vs C27

C27 and C24 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (26.19 and 26.74 MJ/kg). Strength: f_m,k = 24 MPa for C24, f_m,k = 27 MPa for C27.

C24 EN 338:2016 C27 EN 338:2016

Side by side

ratio = C27 / C24 · log scale

Property	C24	C27	Unit	Ratio
E₁ Modulus, direction 1	11	11.5	GPa	1.05×
E₂ Modulus, direction 2	0.37	0.38	GPa	1.03×
E₃ Modulus, direction 3	0.37	0.38	GPa	1.03×
G₁₂ Shear modulus 1-2	0.69	0.72	GPa	1.04×
G₁₃ Shear modulus 1-3	0.69	0.72	GPa	1.04×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	7.4	7.7	GPa	1.04×
ρ Density	420	430	kg/m³	1.02×
ρ_k Density, characteristic (5 % fractile)	350	360	kg/m³	1.03×
f_m,k Bending strength	24	27	MPa	1.12×
f_t,0,k Tension parallel to grain	14.5	16.5	MPa	1.14×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	21	22	MPa	1.05×
f_c,90,k Compression perpendicular to grain	2.5	2.5	MPa	1×
f_v,k Shear strength	4	4	MPa	1×
E/ρ Specific stiffness E/ρ · derived	26.19	26.74	MJ/kg	1.02×
c₀ Bar wave speed √(E/ρ) · derived	5118	5171	m/s	1.01×
f/ρ Specific strength f/ρ · derived	57.14	62.79	kJ/kg	1.1×

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.