D18 vs D75

D75 is 2.3 times as stiff as D18. It is 1.8 times as dense. Per unit mass D75 is 1.3 times as stiff. Strength: f_m,k = 18 MPa for D18, f_m,k = 75 MPa for D75.

D18 EN 338:2016 D75 EN 338:2016

Side by side

ratio = D75 / D18 · log scale

Property	D18	D75	Unit	Ratio
E₁ Modulus, direction 1	9.5	22	GPa	2.32×
E₂ Modulus, direction 2	0.63	1.47	GPa	2.33×
E₃ Modulus, direction 3	0.63	1.47	GPa	2.33×
G₁₂ Shear modulus 1-2	0.59	1.38	GPa	2.34×
G₁₃ Shear modulus 1-3	0.59	1.38	GPa	2.34×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	8	18.5	GPa	2.31×
ρ Density	570	1020	kg/m³	1.79×
ρ_k Density, characteristic (5 % fractile)	475	850	kg/m³	1.79×
f_m,k Bending strength	18	75	MPa	4.17×
f_t,0,k Tension parallel to grain	11	45	MPa	4.09×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	18	37	MPa	2.06×
f_c,90,k Compression perpendicular to grain	4.8	12.8	MPa	2.67×
f_v,k Shear strength	3.5	5	MPa	1.43×
E/ρ Specific stiffness E/ρ · derived	16.67	21.57	MJ/kg	1.29×
c₀ Bar wave speed √(E/ρ) · derived	4082	4644	m/s	1.14×
f/ρ Specific strength f/ρ · derived	31.58	73.53	kJ/kg	2.33×

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.