D35 vs D55

D55 is 1.3 times as stiff as D35. It is 1.2 times as dense. Per unit mass they are about equally stiff (18.46 and 19.62 MJ/kg). Strength: f_m,k = 35 MPa for D35, f_m,k = 55 MPa for D55.

D35 EN 338:2016 D55 EN 338:2016

Side by side

ratio = D55 / D35 · log scale

Property	D35	D55	Unit	Ratio
E₁ Modulus, direction 1	12	15.5	GPa	1.29×
E₂ Modulus, direction 2	0.8	1.03	GPa	1.29×
E₃ Modulus, direction 3	0.8	1.03	GPa	1.29×
G₁₂ Shear modulus 1-2	0.75	0.97	GPa	1.29×
G₁₃ Shear modulus 1-3	0.75	0.97	GPa	1.29×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	10.1	13	GPa	1.29×
ρ Density	650	790	kg/m³	1.22×
ρ_k Density, characteristic (5 % fractile)	540	660	kg/m³	1.22×
f_m,k Bending strength	35	55	MPa	1.57×
f_t,0,k Tension parallel to grain	21	33	MPa	1.57×
f_t,90,k Tension perpendicular to grain	0.6	0.6	MPa	1×
f_c,0,k Compression parallel to grain	25	32	MPa	1.28×
f_c,90,k Compression perpendicular to grain	5.4	6.6	MPa	1.22×
f_v,k Shear strength	4.1	4.7	MPa	1.15×
E/ρ Specific stiffness E/ρ · derived	18.46	19.62	MJ/kg	1.06×
c₀ Bar wave speed √(E/ρ) · derived	4297	4429	m/s	1.03×
f/ρ Specific strength f/ρ · derived	53.85	69.62	kJ/kg	1.29×

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.