D27 vs D80

D80 is 2.3 times as stiff as D27. It is 1.8 times as dense. Per unit mass D80 is 1.3 times as stiff. Strength: f_m,k = 27 MPa for D27, f_m,k = 80 MPa for D80.

D27 EN 338:2016 D80 EN 338:2016

Side by side

ratio = D80 / D27 · log scale

Property	D27	D80	Unit	Ratio
E₁ Modulus, direction 1	10.5	24	GPa	2.29×
E₂ Modulus, direction 2	0.7	1.6	GPa	2.29×
E₃ Modulus, direction 3	0.7	1.6	GPa	2.29×
G₁₂ Shear modulus 1-2	0.66	1.5	GPa	2.27×
G₁₃ Shear modulus 1-3	0.66	1.5	GPa	2.27×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	8.8	20.2	GPa	2.3×
ρ Density	610	1080	kg/m³	1.77×
ρ_k Density, characteristic (5 % fractile)	510	900	kg/m³	1.76×
f_m,k Bending strength	27	80	MPa	2.96×
f_t,0,k Tension parallel to grain	16	48	MPa	3×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	22	38	MPa	1.73×
f_c,90,k Compression perpendicular to grain	5.1	13.5	MPa	2.65×
f_v,k Shear strength	3.8	5	MPa	1.32×
E/ρ Specific stiffness E/ρ · derived	17.21	22.22	MJ/kg	1.29×
c₀ Bar wave speed √(E/ρ) · derived	4149	4714	m/s	1.14×
f/ρ Specific strength f/ρ · derived	44.26	74.07	kJ/kg	1.67×

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.