Comparison
Glass-Filled PBT vs PEEK
A side-by-side comparison of Polybutylene Terephthalate, Glass Fiber Reinforced and Polyether Ether Ketone.
Physical
Density
1.45-1.60 g/cm³
1.32 g/cm³
Water Absorption (24h)
0.1-0.2 %
0.15 %
Transparency
Opaque
Opaque (amber)
Shrinkage
0.3-0.6 %
1.1 – 1.4 %
Mechanical
Young's Modulus
8-12 GPa
3.6 GPa
Tensile Strength
70-100 MPa
100 MPa
Elongation at Break
4-10 %
50 %
Impact Strength (Izod)
6-12 kJ/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
20-50 °C
143 °C
Melting Point
220-230 °C
343 °C
Continuous Service Temperature
100-130 °C
260 °C
Heat Deflection Temperature
150-200 °C (1.8 MPa)
160 °C
Electrical
Dielectric Constant
3.0-3.5
3.2
Volume Resistivity
10^12-10^14 Ohm-cm
10¹⁶ Ω·cm
Dielectric Strength
20-28 kV/mm
—
Chemical resistance
Acids
Good
Excellent
Bases
Fair
Excellent
Solvents
Excellent
Excellent
UV Resistance
Fair
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable
Recyclable (specialty)
Recycling Code
7 (Other)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg