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PEEK vs. PPE

Both PEEK and PPE are thermoplastics. There are 21 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is PEEK and the bottom bar is PPE.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 4.0 to 24
2.3
Elongation at Break, % 1.6 to 43
30
Flexural Strength, MPa 150 to 330
75
Tensile Strength: Ultimate (UTS), MPa 97 to 200
55

Thermal Properties

Glass Transition Temperature, °C 240
85
Heat Deflection Temperature At 1.82 MPa (264 psi), °C 160 to 300
120
Maximum Temperature: Autoignition, °C 600
430
Maximum Temperature: Mechanical, °C 330
90
Melting Onset (Solidus), °C 340
260
Specific Heat Capacity, J/kg-K 1390 to 1700
1200
Thermal Conductivity, W/m-K 0.25 to 0.93
0.22
Thermal Expansion, µm/m-K 15 to 52
90

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 3.0 to 14
13

Otherwise Unclassified Properties

Density, g/cm3 1.3 to 1.5
1.1
Water Absorption After 24 Hours, % 0.060 to 0.3
0.23

Common Calculations

Stiffness to Weight: Axial, points 1.5 to 10
1.2
Stiffness to Weight: Bending, points 36 to 73
42
Strength to Weight: Axial, points 20 to 41
14
Strength to Weight: Bending, points 36 to 55
30
Thermal Diffusivity, mm2/s 0.1 to 0.51
0.17
Thermal Shock Resistance, points 34 to 57
19