Comparison
Lignin Filler vs PEEK
A side-by-side comparison of Lignin, Filler Grade S and Polyether Ether Ketone.
Physical
Density
1.2-1.4 g/cm³
1.32 g/cm³
Water Absorption (24h)
2.0-5.0 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
Varies with matrix
1.1 – 1.4 %
Mechanical
Young's Modulus
Highly variable (depends on source and processing)
3.6 GPa
Tensile Strength
Highly variable
100 MPa
Elongation at Break
Highly variable
50 %
Impact Strength (Izod)
Highly variable
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
100-150 °C
143 °C
Melting Point
None (degrades)
343 °C
Continuous Service Temperature
70 °C
260 °C
Heat Deflection Temperature
Varies with matrix
160 °C
Electrical
Dielectric Constant
3.5-4.5
3.2
Volume Resistivity
10⁹-10¹² Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
10-20 kV/mm
—
Chemical resistance
Acids
Moderate resistance
Excellent
Bases
Poor resistance
Excellent
Solvents
Soluble in some organic solvents like DMSO, dioxin
Excellent
UV Resistance
Good (inherent)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Biodegradable (if not compounded with non-biodegradable matrix)
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Negative to very low (utilizes byproduct)
~30 kg CO₂e / kg