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FKM Rubber vs. Unfilled PTFE

FKM rubber belongs to the thermoset elastomers (rubber) classification, while unfilled PTFE belongs to the thermoplastics. There are 8 material properties with values for both materials. Properties with values for just one material (23, in this case) are not shown.

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

Metric UnitsUS Customary Units

Material Properties

Density, g/cm3 1.8
2.2
Elongation at Break, % 300
300
Glass Transition Temperature, °C -20
-35
Limiting Oxygen Index (LOI), % 51
90
Maximum Temperature: Mechanical, °C 220
270
Strength to Weight: Axial, points 1.1
3.2
Strength to Weight: Bending, points 4.7
8.7
Tensile Strength: Ultimate (UTS), MPa 7.5
25