Fluoroelastomers (FKM & FPM) and Perfluoroelastomers (FFKM) for Diaphragms

Fluoroelastomers and Perfluoroelastomers are ideal for the most aggressive environments that require chemical resistance and high temperature capabilities. Fluorinated elastomers contain either a partially or fully fluorinated backbone. If the backbone is fully fluorinated, it is a perfluoroelastomer (e.g. Kalrez®, FFKM); if it is partially fluorinated, it is a fluoroelastomer (e.g. Viton™, FKM). The unique properties of this material help maintain its seal integrity, which can reduce maintenance, operating costs and improve safety:

Other potential benefits include:

  • Temperature range from -40 °C to +325 °C
  • Exceptional chemical resistance
  • Very low permeability
  • ED (explosive decompression) resistant compounds
  • FDA/USP Class VI type materials
  • Long term service
  • Excellent adhesion to Fabric reinforcement
  • Available in conjunction with Fab•Air

Perfluoroelastomers can resist chemical attacks from nearly all chemical reagents, such as acids, alkalines, ketones, esters, aldehydes, alcohol, and fuels. It can also excel in conditions where steam and hot water are present. High heat and temperature spikes can degrade elastomeric seals causing their crosslinking structure to become permanently damaged. When elastomers are used above their maximum continuous service temperature limit over time, they can become hard and brittle, thereby losing their ability to maintain effective sealing. This can result in premature failures.

DiaCom’s Engineering department recommends that all elastomers and specialty elastomer be tested for suitability in application.



Perfluoroelastomers Diaphragm



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