GL20c vs GL28c

GL28c is 1.2 times as stiff as GL20c. It is 1.1 times as dense. Per unit mass GL28c is 1.1 times as stiff. Strength: f_m,k = 20 MPa for GL20c, f_m,k = 28 MPa for GL28c.

GL20c EN 14080:2013 GL28c EN 14080:2013

Side by side

ratio = GL28c / GL20c · log scale

Property	GL20c	GL28c	Unit	Ratio
E₁ Modulus, direction 1	10.4	12.5	GPa	1.2×
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	8.6	10.4	GPa	1.21×
G₀₅ Shear modulus, 5 % fractile	0.54	0.54	GPa	1×
ρ Density	390	420	kg/m³	1.08×
ρ_k Density, characteristic (5 % fractile)	355	390	kg/m³	1.1×
f_m,k Bending strength	20	28	MPa	1.4×
f_t,0,k Tension parallel to grain	15	19.5	MPa	1.3×
f_t,90,k Tension perpendicular to grain	0.5	0.5	MPa	1×
f_c,0,k Compression parallel to grain	18.5	24	MPa	1.3×
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	26.67	29.76	MJ/kg	1.12×
c₀ Bar wave speed √(E/ρ) · derived	5164	5455	m/s	1.06×
f/ρ Specific strength f/ρ · derived	51.28	66.67	kJ/kg	1.3×

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.