GL20h vs GL28h

GL28h is 1.5 times as stiff as GL20h. It is 1.2 times as dense. Per unit mass GL28h is 1.2 times as stiff. Strength: f_m,k = 20 MPa for GL20h, f_m,k = 28 MPa for GL28h.

GL20h EN 14080:2013 GL28h EN 14080:2013

Side by side

ratio = GL28h / GL20h · log scale

Property	GL20h	GL28h	Unit	Ratio
E₁ Modulus, direction 1	8.4	12.6	GPa	1.5×
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×
G₂₃ Shear modulus 2-3	0.065	0.065	GPa	1×
E₀,₀₅ Modulus parallel to grain, 5 % fractile	7	10.5	GPa	1.5×
E₉₀,₀₅ Modulus perpendicular to grain, 5 % fractile	0.25	0.25	GPa	1×
G₀₅ Shear modulus, 5 % fractile	0.54	0.54	GPa	1×
G_r Rolling shear modulus	0.065	0.065	GPa	1×
ρ Density	370	460	kg/m³	1.24×
ρ_k Density, characteristic (5 % fractile)	340	425	kg/m³	1.25×
f_m,k Bending strength	20	28	MPa	1.4×
f_t,0,k Tension parallel to grain	16	22.3	MPa	1.39×
f_t,90,k Tension perpendicular to grain	0.5	0.5	MPa	1×
f_c,0,k Compression parallel to grain	20	28	MPa	1.4×
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×
f_r,k Rolling shear strength	1.2	1.2	MPa	1×
E/ρ Specific stiffness E/ρ · derived	22.7	27.39	MJ/kg	1.21×
c₀ Bar wave speed √(E/ρ) · derived	4765	5234	m/s	1.1×
f/ρ Specific strength f/ρ · derived	54.05	60.87	kJ/kg	1.13×

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.