Viton is a brand of synthetic rubber and fluoropolymer elastomer commonly used in O-rings and other molded or extruded goods. The name is a registered trademark of DuPont Performance Elastomers L.L.C..
Viton fluoroelastomers are categorized under the ASTM D1418 and ISO 1629 designation of FKM. The fluorine content of the most common Viton grades varies between 66 and 70%.
Each family of Viton® is available in a number of types. The type to be used for a specific application is selected for manufacturability as well as performance.