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PEEK vs. FKM Rubber

PEEK belongs to the thermoplastics classification, while FKM rubber belongs to the thermoset elastomers (rubber). There are 8 material properties with values for both materials. Properties with values for just one material (21, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 1.3 to 1.5
1.8
Elongation at Break, % 1.6 to 43
300
Glass Transition Temperature, °C 240
-20
Limiting Oxygen Index (LOI), % 38
51
Maximum Temperature: Mechanical, °C 330
220
Strength to Weight: Axial, points 20 to 41
1.1
Strength to Weight: Bending, points 36 to 55
4.7
Tensile Strength: Ultimate (UTS), MPa 97 to 200
7.5