Comparison
PP Homopolymer Injection vs PEEK
A side-by-side comparison of Polypropylene Homopolymer for Injection Molding and Polyether Ether Ketone.
Physical
Density
0.900-0.915 g/cm³
1.32 g/cm³
Water Absorption (24h)
<0.05 %
0.15 %
Transparency
Can be translucent to opaque
Opaque (amber)
Shrinkage
1-2.5 %
1.1 – 1.4 %
Mechanical
Young's Modulus
1.2-1.7 GPa
3.6 GPa
Tensile Strength
30-40 MPa
100 MPa
Elongation at Break
2-10 %
50 %
Impact Strength (Izod)
50-100 J/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-10 °C
143 °C
Melting Point
160-170 °C
343 °C
Continuous Service Temperature
80-100 °C
260 °C
Heat Deflection Temperature
60-80 °C
160 °C
Electrical
Dielectric Constant
2.2-2.3
3.2
Volume Resistivity
>10¹⁶ Ω⋅cm
10¹⁶ Ω·cm
Dielectric Strength
20-30 kV/mm
—
Chemical resistance
Acids
Excellent resistance
Excellent
Bases
Excellent resistance
Excellent
Solvents
Good resistance at room temperature, swells in hot aromatic and chlorinated hydrocarbons
Excellent
UV Resistance
Poor (requires stabilization)
Fair
Hydrolysis (steam)
—
Excellent
Sustainability
Recyclability
Recyclable
Recyclable (specialty)
Recycling Code
5 (PP)
7
Carbon Footprint
Moderate
~30 kg CO₂e / kg