Teflon® Encapsulated O-Rings
Elastomeric, rubber O-Rings are susceptible to high friction and limited resistance to aggressive chemicals and gas permeation. Solid PTFE O-Rings are rigid with no effective memory and high compression set. CHEM-RING™ Teflon® Encapsulated O-Rings combine the resilience and sealing force of an elastomer with the chemical resistance of Teflon®. This is accomplished by the use of an elastomeric core of silicone or Viton™ with a relatively thin encapsulation of Teflon® FEP or PFA fluoropolymer. The result is an elastomeric PTFE seal with enhanced sealing capability.
RT Dygert's Chem-RING Teflon® Encapsulated O-Rings are solvent-resistant and chemically inert (except for attack by alkaline metals, fluorine and some halogenated compounds at high temperatures), yet have an elastomeric memory near that of rubber O-Rings. The more commonly specified FEP encapsulation also has an extremely low coefficient of friction (.1 to .2) and very low permeability to gases, making CHEM-RINGS virtually a universal seal for use in hostile environments.