C16 vs C20

C20 is 1.2 times as stiff as C16. It is 1.1 times as dense. Per unit mass C20 is 1.1 times as stiff. Strength: f_m,k = 16 MPa for C16, f_m,k = 20 MPa for C20.

C16 EN 338:2016 C20 EN 338:2016

Side by side

ratio = C20 / C16 · log scale

Property	C16	C20	Unit	Ratio
E₁ Modulus, direction 1	8	9.5	GPa	1.19×
E₂ Modulus, direction 2	0.27	0.32	GPa	1.19×
E₃ Modulus, direction 3	0.27	0.32	GPa	1.19×
G₁₂ Shear modulus 1-2	0.5	0.59	GPa	1.18×
G₁₃ Shear modulus 1-3	0.5	0.59	GPa	1.18×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	5.4	6.4	GPa	1.19×
ρ Density	370	400	kg/m³	1.08×
ρ_k Density, characteristic (5 % fractile)	310	330	kg/m³	1.06×
f_m,k Bending strength	16	20	MPa	1.25×
f_t,0,k Tension parallel to grain	8.5	11.5	MPa	1.35×
f_t,90,k Tension perpendicular to grain	0.4	0.4	MPa	1×
f_c,0,k Compression parallel to grain	17	19	MPa	1.12×
f_c,90,k Compression perpendicular to grain	2.2	2.3	MPa	1.05×
f_v,k Shear strength	3.2	3.6	MPa	1.12×
E/ρ Specific stiffness E/ρ · derived	21.62	23.75	MJ/kg	1.1×
c₀ Bar wave speed √(E/ρ) · derived	4650	4873	m/s	1.05×
f/ρ Specific strength f/ρ · derived	43.24	50	kJ/kg	1.16×

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.