Comparison

Polypropylene vs PEEK

A side-by-side comparison of Polypropylene and Polyether Ether Ketone.

Property

Polypropylene

PEEK

Physical

Density

0.90 g/cm³

1.32 g/cm³

Water Absorption (24h)

0.01 %

0.15 %

Transparency

Translucent

Opaque (amber)

Shrinkage

1.0 – 2.5 %

1.1 – 1.4 %

Mechanical

Young's Modulus

1.5 GPa

3.6 GPa

Tensile Strength

30 – 40 MPa

100 MPa

Impact Strength (Izod)

40 J/m

55 J/m

Elongation at Break

100 – 600 %

50 %

Flexural Strength

—

170 MPa

Thermal

Melting Point

160 °C

343 °C

Continuous Service Temperature

100 °C

260 °C

Heat Deflection Temperature

100 °C

160 °C

Glass Transition Temperature

—

143 °C

Electrical

Dielectric Constant

2.2

3.2

Volume Resistivity

10¹⁷ Ω·cm

10¹⁶ Ω·cm

Chemical resistance

Acids

Excellent

Bases

Excellent

Solvents

Good

Excellent

UV Resistance

Poor unless stabilized

Fair

Hydrolysis (steam)

—

Excellent

Sustainability

Recyclability

Recyclable

Recyclable (specialty)

Recycling Code

Carbon Footprint

~1.6 kg CO₂e / kg

~30 kg CO₂e / kg