D30 vs D75

D75 is about twice as stiff as D30. It is 1.6 times as dense. Per unit mass D75 is 1.3 times as stiff. Strength: f_m,k = 30 MPa for D30, f_m,k = 75 MPa for D75.

D30 EN 338:2016 D75 EN 338:2016

Side by side

ratio = D75 / D30 · log scale

Property	D30	D75	Unit	Ratio
E₁ Modulus, direction 1	11	22	GPa	2×
E₂ Modulus, direction 2	0.73	1.47	GPa	2.01×
E₃ Modulus, direction 3	0.73	1.47	GPa	2.01×
G₁₂ Shear modulus 1-2	0.69	1.38	GPa	2×
G₁₃ Shear modulus 1-3	0.69	1.38	GPa	2×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	9.2	18.5	GPa	2.01×
ρ Density	640	1020	kg/m³	1.59×
ρ_k Density, characteristic (5 % fractile)	530	850	kg/m³	1.6×
f_m,k Bending strength	30	75	MPa	2.5×
f_t,0,k Tension parallel to grain	18	45	MPa	2.5×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	24	37	MPa	1.54×
f_c,90,k Compression perpendicular to grain	5.3	12.8	MPa	2.42×
f_v,k Shear strength	3.9	5	MPa	1.28×
E/ρ Specific stiffness E/ρ · derived	17.19	21.57	MJ/kg	1.25×
c₀ Bar wave speed √(E/ρ) · derived	4146	4644	m/s	1.12×
f/ρ Specific strength f/ρ · derived	46.88	73.53	kJ/kg	1.57×

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.