FKM is a family of fluorocarbon-based fluoroelastomer materials defined by ASTM International standard D1418 and ISO standard 1629. It is commonly called fluorine rubber or fluoro-rubber. FKM is an abbreviation of Fluorkautschukmaterial. All FKMs contain vinylidene fluoride as the common monomer, to which different other monomers are added for specific types and functionalities, fitting the desired application.

From Wikipedia (CC BY-SA 4.0).

On IJR

No public IJR answers mention Viton yet. As people ask about it and share their answers, they'll appear here.

Facts from Wikidata (CC0).

Overview

From Wikipedia (CC BY-SA 4.0).