C14 vs C27

C27 is 1.6 times as stiff as C14. It is 1.2 times as dense. Per unit mass C27 is 1.3 times as stiff. Strength: f_m,k = 14 MPa for C14, f_m,k = 27 MPa for C27.

C14 EN 338:2016 C27 EN 338:2016

Side by side

ratio = C27 / C14 · log scale

Property	C14	C27	Unit	Ratio
E₁ Modulus, direction 1	7	11.5	GPa	1.64×
E₂ Modulus, direction 2	0.23	0.38	GPa	1.65×
E₃ Modulus, direction 3	0.23	0.38	GPa	1.65×
G₁₂ Shear modulus 1-2	0.44	0.72	GPa	1.64×
G₁₃ Shear modulus 1-3	0.44	0.72	GPa	1.64×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	4.7	7.7	GPa	1.64×
ρ Density	350	430	kg/m³	1.23×
ρ_k Density, characteristic (5 % fractile)	290	360	kg/m³	1.24×
f_m,k Bending strength	14	27	MPa	1.93×
f_t,0,k Tension parallel to grain	7.2	16.5	MPa	2.29×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	16	22	MPa	1.38×
f_c,90,k Compression perpendicular to grain	2	2.5	MPa	1.25×
f_v,k Shear strength	3	4	MPa	1.33×
E/ρ Specific stiffness E/ρ · derived	20	26.74	MJ/kg	1.34×
c₀ Bar wave speed √(E/ρ) · derived	4472	5171	m/s	1.16×
f/ρ Specific strength f/ρ · derived	40	62.79	kJ/kg	1.57×

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.