D65 vs D75

D75 is 1.2 times as stiff as D65. It is 1.1 times as dense. Per unit mass they are about equally stiff (20.56 and 21.57 MJ/kg). Strength: f_m,k = 65 MPa for D65, f_m,k = 75 MPa for D75.

D65 EN 338:2016 D75 EN 338:2016

Side by side

ratio = D75 / D65 · log scale

Property	D65	D75	Unit	Ratio
E₁ Modulus, direction 1	18.5	22	GPa	1.19×
E₂ Modulus, direction 2	1.23	1.47	GPa	1.2×
E₃ Modulus, direction 3	1.23	1.47	GPa	1.2×
G₁₂ Shear modulus 1-2	1.16	1.38	GPa	1.19×
G₁₃ Shear modulus 1-3	1.16	1.38	GPa	1.19×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	15.5	18.5	GPa	1.19×
ρ Density	900	1020	kg/m³	1.13×
ρ_k Density, characteristic (5 % fractile)	750	850	kg/m³	1.13×
f_m,k Bending strength	65	75	MPa	1.15×
f_t,0,k Tension parallel to grain	39	45	MPa	1.15×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	35	37	MPa	1.06×
f_c,90,k Compression perpendicular to grain	11.3	12.8	MPa	1.13×
f_v,k Shear strength	5	5	MPa	1×
E/ρ Specific stiffness E/ρ · derived	20.56	21.57	MJ/kg	1.05×
c₀ Bar wave speed √(E/ρ) · derived	4534	4644	m/s	1.02×
f/ρ Specific strength f/ρ · derived	72.22	73.53	kJ/kg	1.02×

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.