FEP PTFE ENCAPSULATED O-RINGS

Welcome to contact us for  FEP PTFE PFA coated o-rings

FEP type PTFE Fluoropolymers (performance plastics) offer excellent chemical and temperature resistance. The main offsetting limitation is PTFE's stiffness that can require custom gland design to maximize sealing by using the right amount of compression force to maintain a seal without over compressing which can shorten seal life. PFA type PTFE is also available for additional upper temperature resistance (up to +575° F short exposure) but not widely used due to reduced sealing performance.

Fep coated o-rings

PFA/PTFE encapsulated O rings

Description

FEP 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 chemical 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 resistance is achieved by the seamless FEP coating.

Applications

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 applications. 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.

Properties

·         Very good chemical resistance against most liquids and chemicals

·         Temperature range from approx. –60 °C to 200 °C [depending on inner ring material]

·         No contamination of food, pharmaceutical or medical products

·         Physiologically harmless, can be sterilised

·         Sufficient elastic behaviour

·         FEP O-rings can be replaced with standard O-ring seals without limitation

·         No changes to the groove dimensions are necessary

·         The O-rings are less flexible than elastomer O-rings due to the FEP coating. They can only be stretched minimally and have a lower elasticity or a higher permanent deformation