D35 vs D80

D80 is about twice as stiff as D35. It is 1.7 times as dense. Per unit mass D80 is 1.2 times as stiff. Strength: f_m,k = 35 MPa for D35, f_m,k = 80 MPa for D80.

D35 EN 338:2016 D80 EN 338:2016

Side by side

ratio = D80 / D35 · log scale

Property	D35	D80	Unit	Ratio
E₁ Modulus, direction 1	12	24	GPa	2×
E₂ Modulus, direction 2	0.8	1.6	GPa	2×
E₃ Modulus, direction 3	0.8	1.6	GPa	2×
G₁₂ Shear modulus 1-2	0.75	1.5	GPa	2×
G₁₃ Shear modulus 1-3	0.75	1.5	GPa	2×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	10.1	20.2	GPa	2×
ρ Density	650	1080	kg/m³	1.66×
ρ_k Density, characteristic (5 % fractile)	540	900	kg/m³	1.67×
f_m,k Bending strength	35	80	MPa	2.29×
f_t,0,k Tension parallel to grain	21	48	MPa	2.29×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	25	38	MPa	1.52×
f_c,90,k Compression perpendicular to grain	5.4	13.5	MPa	2.5×
f_v,k Shear strength	4.1	5	MPa	1.22×
E/ρ Specific stiffness E/ρ · derived	18.46	22.22	MJ/kg	1.2×
c₀ Bar wave speed √(E/ρ) · derived	4297	4714	m/s	1.1×
f/ρ Specific strength f/ρ · derived	53.85	74.07	kJ/kg	1.38×

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.