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Fluorocarbon Rubber (FKM, FPM)

FKM rubber is a thermoset elastomer or rubber material. It has a fairly high density among rubber materials. In addition, it has a fairly low tensile strength and a moderately low ductility. The graph bars on the material properties cards below compare FKM rubber to other rubber materials (top) and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Elongation at Break

300 %

Tensile Strength: Ultimate (UTS)

7.5 MPa 1.1 x 103 psi

Thermal Properties

Glass Transition Temperature

-20 °C -4.0 °F

Maximum Temperature: Mechanical

220 °C 420 °F

Otherwise Unclassified Properties


1.8 g/cm3 110 lb/ft3

Limiting Oxygen Index (LOI)

51 %

Common Calculations

Strength to Weight: Axial

1.1 points

Strength to Weight: Bending

4.7 points

Followup Questions

Further Reading

Rubber Formulary, The, Peter A. Ciullo and Norman Hewitt, 1999