Comparison
PETG FDM Filament vs PEEK
A side-by-side comparison of Polyethylene Terephthalate Glycol-Modified Filament for FDM and Polyether Ether Ketone.
Physical
Density
1.27 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.3-0.6 %
0.15 %
Transparency
Transparent to Translucent
Opaque (amber)
Shrinkage
Low (0.3-0.6%)
1.1 – 1.4 %
Mechanical
Young's Modulus
2.0-2.5 GPa
3.6 GPa
Tensile Strength
50-60 MPa
100 MPa
Elongation at Break
6-15 %
50 %
Impact Strength (Izod)
6-10 kJ/m²
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
70-80 °C
143 °C
Melting Point
210-250 °C
343 °C
Continuous Service Temperature
50-60 °C
260 °C
Heat Deflection Temperature
55-65 °C @ 0.45 MPa
160 °C
Electrical
Dielectric Constant
3.0-3.2
3.2
Volume Resistivity
10¹³-10¹⁵ Ω·cm
10¹⁶ Ω·cm
Dielectric Strength
15-20 MV/m
—
Chemical resistance
Acids
Good resistance to dilute acids and bases
Excellent
Bases
Moderate resistance to dilute bases
Excellent
Solvents
Resistant to oils, greases. Attacked by strong polar solvents.
Excellent
UV Resistance
Good
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable (PET stream)
Recyclable (specialty)
Recycling Code
1 (PET)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg