D45 vs D80

D80 is 1.8 times as stiff as D45. It is 1.5 times as dense. Per unit mass D80 is 1.2 times as stiff. Strength: f_m,k = 45 MPa for D45, f_m,k = 80 MPa for D80.

D45 EN 338:2016 D80 EN 338:2016

Side by side

ratio = D80 / D45 · log scale

Property	D45	D80	Unit	Ratio
E₁ Modulus, direction 1	13.5	24	GPa	1.78×
E₂ Modulus, direction 2	0.9	1.6	GPa	1.78×
E₃ Modulus, direction 3	0.9	1.6	GPa	1.78×
G₁₂ Shear modulus 1-2	0.84	1.5	GPa	1.79×
G₁₃ Shear modulus 1-3	0.84	1.5	GPa	1.79×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	11.3	20.2	GPa	1.79×
ρ Density	700	1080	kg/m³	1.54×
ρ_k Density, characteristic (5 % fractile)	580	900	kg/m³	1.55×
f_m,k Bending strength	45	80	MPa	1.78×
f_t,0,k Tension parallel to grain	27	48	MPa	1.78×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	29	38	MPa	1.31×
f_c,90,k Compression perpendicular to grain	5.8	13.5	MPa	2.33×
f_v,k Shear strength	4.4	5	MPa	1.14×
E/ρ Specific stiffness E/ρ · derived	19.29	22.22	MJ/kg	1.15×
c₀ Bar wave speed √(E/ρ) · derived	4392	4714	m/s	1.07×
f/ρ Specific strength f/ρ · derived	64.29	74.07	kJ/kg	1.15×

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.