D30 vs D70

D70 is 1.8 times as stiff as D30. It is 1.5 times as dense. Per unit mass D70 is 1.2 times as stiff. Strength: f_m,k = 30 MPa for D30, f_m,k = 70 MPa for D70.

D30 EN 338:2016 D70 EN 338:2016

Side by side

ratio = D70 / D30 · log scale

Property	D30	D70	Unit	Ratio
E₁ Modulus, direction 1	11	20	GPa	1.82×
E₂ Modulus, direction 2	0.73	1.33	GPa	1.82×
E₃ Modulus, direction 3	0.73	1.33	GPa	1.82×
G₁₂ Shear modulus 1-2	0.69	1.25	GPa	1.81×
G₁₃ Shear modulus 1-3	0.69	1.25	GPa	1.81×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	9.2	16.8	GPa	1.83×
ρ Density	640	960	kg/m³	1.5×
ρ_k Density, characteristic (5 % fractile)	530	800	kg/m³	1.51×
f_m,k Bending strength	30	70	MPa	2.33×
f_t,0,k Tension parallel to grain	18	42	MPa	2.33×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	24	36	MPa	1.5×
f_c,90,k Compression perpendicular to grain	5.3	12	MPa	2.26×
f_v,k Shear strength	3.9	5	MPa	1.28×
E/ρ Specific stiffness E/ρ · derived	17.19	20.83	MJ/kg	1.21×
c₀ Bar wave speed √(E/ρ) · derived	4146	4564	m/s	1.1×
f/ρ Specific strength f/ρ · derived	46.88	72.92	kJ/kg	1.56×

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.