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FKM Rubber vs. PEEK

FKM rubber belongs to the thermoset elastomers (rubber) classification, while PEEK belongs to the thermoplastics. 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 FKM rubber and the bottom bar is PEEK.

Metric UnitsUS Customary Units

Material Properties

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