C22 vs C40

C40 is 1.4 times as stiff as C22. It is 1.2 times as dense. Per unit mass C40 is 1.2 times as stiff. Strength: f_m,k = 22 MPa for C22, f_m,k = 40 MPa for C40.

C22 EN 338:2016 C40 EN 338:2016

Side by side

ratio = C40 / C22 · log scale

Property	C22	C40	Unit	Ratio
E₁ Modulus, direction 1	10	14	GPa	1.4×
E₂ Modulus, direction 2	0.33	0.47	GPa	1.42×
E₃ Modulus, direction 3	0.33	0.47	GPa	1.42×
G₁₂ Shear modulus 1-2	0.63	0.88	GPa	1.4×
G₁₃ Shear modulus 1-3	0.63	0.88	GPa	1.4×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	6.7	9.4	GPa	1.4×
ρ Density	410	480	kg/m³	1.17×
ρ_k Density, characteristic (5 % fractile)	340	400	kg/m³	1.18×
f_m,k Bending strength	22	40	MPa	1.82×
f_t,0,k Tension parallel to grain	13	26	MPa	2×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	20	27	MPa	1.35×
f_c,90,k Compression perpendicular to grain	2.4	2.8	MPa	1.17×
f_v,k Shear strength	3.8	4	MPa	1.05×
E/ρ Specific stiffness E/ρ · derived	24.39	29.17	MJ/kg	1.2×
c₀ Bar wave speed √(E/ρ) · derived	4939	5401	m/s	1.09×
f/ρ Specific strength f/ρ · derived	53.66	83.33	kJ/kg	1.55×

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.