D50 vs D80

D80 is 1.7 times as stiff as D50. It is 1.5 times as dense. Per unit mass D80 is 1.2 times as stiff. Strength: f_m,k = 50 MPa for D50, f_m,k = 80 MPa for D80.

D50 EN 338:2016 D80 EN 338:2016

Side by side

ratio = D80 / D50 · log scale

Property	D50	D80	Unit	Ratio
E₁ Modulus, direction 1	14	24	GPa	1.71×
E₂ Modulus, direction 2	0.93	1.6	GPa	1.72×
E₃ Modulus, direction 3	0.93	1.6	GPa	1.72×
G₁₂ Shear modulus 1-2	0.88	1.5	GPa	1.7×
G₁₃ Shear modulus 1-3	0.88	1.5	GPa	1.7×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	11.8	20.2	GPa	1.71×
ρ Density	740	1080	kg/m³	1.46×
ρ_k Density, characteristic (5 % fractile)	620	900	kg/m³	1.45×
f_m,k Bending strength	50	80	MPa	1.6×
f_t,0,k Tension parallel to grain	30	48	MPa	1.6×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	30	38	MPa	1.27×
f_c,90,k Compression perpendicular to grain	6.2	13.5	MPa	2.18×
f_v,k Shear strength	4.5	5	MPa	1.11×
E/ρ Specific stiffness E/ρ · derived	18.92	22.22	MJ/kg	1.17×
c₀ Bar wave speed √(E/ρ) · derived	4350	4714	m/s	1.08×
f/ρ Specific strength f/ρ · derived	67.57	74.07	kJ/kg	1.1×

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.