D24 vs D70

D70 is about twice as stiff as D24. It is 1.7 times as dense. Per unit mass D70 is 1.2 times as stiff. Strength: f_m,k = 24 MPa for D24, f_m,k = 70 MPa for D70.

D24 EN 338:2016 D70 EN 338:2016

Side by side

ratio = D70 / D24 · log scale

Property	D24	D70	Unit	Ratio
E₁ Modulus, direction 1	10	20	GPa	2×
E₂ Modulus, direction 2	0.67	1.33	GPa	1.99×
E₃ Modulus, direction 3	0.67	1.33	GPa	1.99×
G₁₂ Shear modulus 1-2	0.63	1.25	GPa	1.98×
G₁₃ Shear modulus 1-3	0.63	1.25	GPa	1.98×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	8.4	16.8	GPa	2×
ρ Density	580	960	kg/m³	1.66×
ρ_k Density, characteristic (5 % fractile)	485	800	kg/m³	1.65×
f_m,k Bending strength	24	70	MPa	2.92×
f_t,0,k Tension parallel to grain	14	42	MPa	3×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	21	36	MPa	1.71×
f_c,90,k Compression perpendicular to grain	4.9	12	MPa	2.45×
f_v,k Shear strength	3.7	5	MPa	1.35×
E/ρ Specific stiffness E/ρ · derived	17.24	20.83	MJ/kg	1.21×
c₀ Bar wave speed √(E/ρ) · derived	4152	4564	m/s	1.1×
f/ρ Specific strength f/ρ · derived	41.38	72.92	kJ/kg	1.76×

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.