Greene, Tweed’s Chemraz® 517, a perfluoroelastomer (FFKM), is a white specialty compound, perfect for applications where contamination from carbon black must be prevented. Chemraz® 517 has a Shore A hardness value of 80. Because of its wide temperature range, -22ºF to 428ºF (-30ºC to 220ºC) Chemraz® 517 is well suited for use in a range of applications, from mechanical seals to mixers.

Available for use as O-rings, gaskets and many other custom shapes.

Features & Benefits

  • No carbon black residue
  • Low temperature capabilities (-22ºF/-30ºC)


  • Mechanical seals
  • Sampling/metering equipment
  • Pump housings