GL28c vs GL30c

GL30c and GL28c are about equally stiff. Their densities are about the same. Per unit mass they are about equally stiff (29.76 and 30.23 MJ/kg). Strength: f_m,k = 28 MPa for GL28c, f_m,k = 30 MPa for GL30c.

GL28c EN 14080:2013 GL30c EN 14080:2013

Side by side

ratio = GL30c / GL28c · log scale

Property	GL28c	GL30c	Unit	Ratio
E₁ Modulus, direction 1	12.5	13	GPa	1.04×
E₂ Modulus, direction 2	0.3	0.3	GPa	1×
E₃ Modulus, direction 3	0.3	0.3	GPa	1×
G₁₂ Shear modulus 1-2	0.65	0.65	GPa	1×
G₁₃ Shear modulus 1-3	0.65	0.65	GPa	1×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	10.4	10.8	GPa	1.04×
G₀₅ Shear modulus, 5 % fractile	0.54	0.54	GPa	1×
ρ Density	420	430	kg/m³	1.02×
ρ_k Density, characteristic (5 % fractile)	390	390	kg/m³	1×
f_m,k Bending strength	28	30	MPa	1.07×
f_t,0,k Tension parallel to grain	19.5	19.5	MPa	1×
f_t,90,k Tension perpendicular to grain	0.5	0.5	MPa	1×
f_c,0,k Compression parallel to grain	24	24.5	MPa	1.02×
f_c,90,k Compression perpendicular to grain	2.5	2.5	MPa	1×
f_v,k Shear strength	3.5	3.5	MPa	1×
E/ρ Specific stiffness E/ρ · derived	29.76	30.23	MJ/kg	1.02×
c₀ Bar wave speed √(E/ρ) · derived	5455	5498	m/s	1.01×
f/ρ Specific strength f/ρ · derived	66.67	69.77	kJ/kg	1.05×

Values at the first thickness band or product form of each material (EN 14080:2013; EN 14080:2013). 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.