Comparison
CF-PET Filament vs PEEK
A side-by-side comparison of Carbon Fiber Reinforced PET Filament for FDM and Polyether Ether Ketone.
Physical
Density
1.30-1.38 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.3-0.5 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
Low (0.3-0.5%)
1.1 – 1.4 %
Mechanical
Young's Modulus
7-10 GPa
3.6 GPa
Tensile Strength
60-75 MPa
100 MPa
Elongation at Break
5-10 %
50 %
Impact Strength (Izod)
5-8 kJ/m²
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
75-85 °C
143 °C
Melting Point
215-255 °C
343 °C
Continuous Service Temperature
60-70 °C
260 °C
Heat Deflection Temperature
60-70 °C @ 0.45 MPa
160 °C
Electrical
Dielectric Constant
2.8-3.2
3.2
Volume Resistivity
10¹²-10¹⁴ Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
12-18 MV/m
—
Chemical resistance
Acids
Good resistance
Excellent
Bases
Moderate resistance
Excellent
Solvents
Resistant to oils, greases. Attacked by strong polar solvents.
Excellent
UV Resistance
Good
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Limited (composite)
Recyclable (specialty)
Recycling Code
1 (PET)
7
Carbon Footprint
Moderate to High
~30 kg CO₂e / kg