C20 vs C22

C22 and C20 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (23.75 and 24.39 MJ/kg). Strength: f_m,k = 20 MPa for C20, f_m,k = 22 MPa for C22.

C20 EN 338:2016 C22 EN 338:2016

Side by side

ratio = C22 / C20 · log scale

Property	C20	C22	Unit	Ratio
E₁ Modulus, direction 1	9.5	10	GPa	1.05×
E₂ Modulus, direction 2	0.32	0.33	GPa	1.03×
E₃ Modulus, direction 3	0.32	0.33	GPa	1.03×
G₁₂ Shear modulus 1-2	0.59	0.63	GPa	1.07×
G₁₃ Shear modulus 1-3	0.59	0.63	GPa	1.07×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	6.4	6.7	GPa	1.05×
ρ Density	400	410	kg/m³	1.02×
ρ_k Density, characteristic (5 % fractile)	330	340	kg/m³	1.03×
f_m,k Bending strength	20	22	MPa	1.1×
f_t,0,k Tension parallel to grain	11.5	13	MPa	1.13×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	19	20	MPa	1.05×
f_c,90,k Compression perpendicular to grain	2.3	2.4	MPa	1.04×
f_v,k Shear strength	3.6	3.8	MPa	1.06×
E/ρ Specific stiffness E/ρ · derived	23.75	24.39	MJ/kg	1.03×
c₀ Bar wave speed √(E/ρ) · derived	4873	4939	m/s	1.01×
f/ρ Specific strength f/ρ · derived	50	53.66	kJ/kg	1.07×

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.