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PTFE vs. PEEK

Both PTFE and PEEK are thermoplastics. There are 16 material properties with values for both materials. Properties with values for just one material (15, in this case) are not shown.

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

Metric UnitsUS Customary Units

Mechanical Properties

Compressive (Crushing) Strength, MPa 6.9 to 24
120 to 300
Elongation at Break, % 75 to 300
1.6 to 43
Flexural Modulus, GPa 0.4 to 1.3
3.8 to 19
Flexural Strength, MPa 13 to 50
150 to 330
Tensile Strength: Ultimate (UTS), MPa 13 to 25
97 to 200

Thermal Properties

Heat Deflection Temperature At 1.82 MPa (264 psi), °C 66 to 70
160 to 300
Maximum Temperature: Mechanical, °C 260 to 270
330
Melting Onset (Solidus), °C 330 to 340
340
Thermal Conductivity, W/m-K 0.24 to 0.65
0.25 to 0.93
Thermal Expansion, µm/m-K 110 to 120
15 to 52

Electrical Properties

Electrical Resistivity Order of Magnitude, 10x Ω-m 2.0 to 18
3.0 to 14

Otherwise Unclassified Properties

Density, g/cm3 2.1 to 2.3
1.3 to 1.5
Limiting Oxygen Index (LOI), % 90
38
Water Absorption After 24 Hours, % 0.0093 to 0.050
0.060 to 0.3

Common Calculations

Strength to Weight: Axial, points 1.7 to 3.2
20 to 41
Strength to Weight: Bending, points 5.7 to 8.7
36 to 55