FEP/PFA-encapsulated O-rings use a seamless fluoropolymer jacket bonded over a conventional elastomer core, combining PTFE-family chemical inertness at the sealing surface with the elastomer core's compression characteristics. FITCO positions this construction as a bridge between conventional elastomers and FFKM.
Select encapsulated O-rings for static or very slow sealing applications involving solvents and aggressive chemicals where elastic recovery requirements are limited — encapsulated seals generally have lower elastic recovery than conventional rubber O-rings.
| Hardness | Core-dependent — typically 70–90 Shore A jacketed hardness |
| Temperature Range | -20°C to 200°C continuous (core-material dependent) |
| Relevant Standards / Certifications | AS568, ISO 3601-1 sizing; jacket material typically FEP or PFA per FDA-listed resins |
Encapsulated O-rings offer a lower-cost alternative to solid FFKM for static chemical-exposure sealing, at the cost of dynamic performance and elastic recovery. For dynamic seals in aggressive chemical service, solid FFKM remains the appropriate choice.
Precision-molded circular seals available across FITCO's full specialty material range.
View O-Rings →Generally not recommended — the construction is primarily suited to static or very slow applications due to lower elastic recovery.
Share your fluid, temperature, pressure and certification requirement — FITCO will review and propose a suitable FEP/PFA Encapsulated compound.
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