FKM
There are four families of viton polymers:
1. A (Dipolymers of VF2/HFP): General purpose sealing. Automotive, Aerospace fuels & lubricants. Nominal polymer fluorine content: 66%.
2. B (Terpolymers of VF2/HFP/TFE): Chemical Process plant, Power Utility Seals & Gaskets. Nominal polymer fluorine content: 68%.
3. F (Terpolymers of VF2/HFP/TFE): Oxygenated Automotive fuels. Concentrated aqueous inorganic acids, water, steam. Nominal polymer fluorine content: 70%.
4. Specialty types include GLT, GBLT, GFLT & Viton Extreme (Copolymers of TFE/Propylene and Ethylene/TFE/PMVE): Automotive, Oil Exploration, Special Sealing & Ultra Harsh Environments