Comparison
PP Random Copolymer Injection vs PEEK
A side-by-side comparison of Polypropylene Random Copolymer for Injection Molding and Polyether Ether Ketone.
Physical
Density
0.900-0.908 g/cm³
1.32 g/cm³
Water Absorption (24h)
<0.05 %
0.15 %
Transparency
Good to Excellent
Opaque (amber)
Shrinkage
1-2.5 %
1.1 – 1.4 %
Mechanical
Young's Modulus
0.8-1.2 GPa
3.6 GPa
Tensile Strength
25-35 MPa
100 MPa
Elongation at Break
20-50 %
50 %
Impact Strength (Izod)
80-150 J/m
55 J/m
Flexural Strength
—
170 MPa
Thermal
Glass Transition Temperature
-10 °C
143 °C
Melting Point
120-140 °C
343 °C
Continuous Service Temperature
60-80 °C
260 °C
Heat Deflection Temperature
40-55 °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