The name Viton is a trademark, refers to fluorocarbon o rings, or FKM/FPM for short. Viton oil seals or Viton seal feature excellent resistance to petroleum products and solvents. They have good high temperature and low compression set characteristics. They are suited for use with wide chemical exposure situations and for hard vacuum service.
Viton seal or Viton oil seal is used because it has a lower probability of catching fire, even with the increased percentages of oxygen found in Nitrox. It is also less susceptible to decay under increased oxygen conditions.