D27 vs D30

D30 and D27 are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (17.21 and 17.19 MJ/kg). Strength: f_m,k = 27 MPa for D27, f_m,k = 30 MPa for D30.

D27 EN 338:2016 D30 EN 338:2016

Side by side

ratio = D30 / D27 · log scale

Property	D27	D30	Unit	Ratio
E₁ Modulus, direction 1	10.5	11	GPa	1.05×
E₂ Modulus, direction 2	0.7	0.73	GPa	1.04×
E₃ Modulus, direction 3	0.7	0.73	GPa	1.04×
G₁₂ Shear modulus 1-2	0.66	0.69	GPa	1.05×
G₁₃ Shear modulus 1-3	0.66	0.69	GPa	1.05×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	8.8	9.2	GPa	1.05×
ρ Density	610	640	kg/m³	1.05×
ρ_k Density, characteristic (5 % fractile)	510	530	kg/m³	1.04×
f_m,k Bending strength	27	30	MPa	1.11×
f_t,0,k Tension parallel to grain	16	18	MPa	1.12×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	22	24	MPa	1.09×
f_c,90,k Compression perpendicular to grain	5.1	5.3	MPa	1.04×
f_v,k Shear strength	3.8	3.9	MPa	1.03×
E/ρ Specific stiffness E/ρ · derived	17.21	17.19	MJ/kg	0.999×
c₀ Bar wave speed √(E/ρ) · derived	4149	4146	m/s	0.999×
f/ρ Specific strength f/ρ · derived	44.26	46.88	kJ/kg	1.06×

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.