FEP Coated "O" Rings
FEP [Fluorinated ethylene-propylene] is a thermoplastic material with properties similar to PTFE. O-rings which are seamlessly coated with FEP have an elastic core made from FPM or VMQ and are used if very high thermal or chem¬ical loads are present. The high chemical resistance of the coating protects the core against damage by the potentially aggressive medium.
FEP coated O-rings are used – similar to PTFE-rings – where the chemical resistance of the normal elastomer O-ring is no longer sufficient, but where a certain elasticity is needed. The elasticity is ensured by the inner ring and the chemical resis¬tance is achieved by the seamless FEP coating.
FEP coated O-rings are perfectly suited for the chemical and petrochemical sector, medical technology, food sector, water and waste water technology and similar industrial appli¬cations. A typical application for FEP coated O-rings is the sealing of valve stems and as a secondary sealing element for slow switching and rotary movements.