Encapsulated O-Rings FEP/PFA

Maximum chemical resistance and sealing

In industrial applications where chemical compatibility and resistance to extreme temperatures are essential, FEP/PFA Encapsulated O-Rings represent an advanced solution compared to conventional O-rings. Thanks to their combination of materials, they provide excellent sealing in aggressive environments, minimizing the risk of failure and enhancing system durability.

Structure of FEP/PFA encapsulated O-Rings

Encapsulated O-Rings are composed of two key elements:

• Internal elastic core: Provides the elasticity and recovery capacity necessary to ensure sealing. It can be made of Silicone (VMQ), which offers greater flexibility and compression, or FKM (Viton®), which provides better chemical and thermal resistance.
• Outer coating: The encapsulation layer of FEP (Fluorinated Ethylene Propylene) or PFA (Perfluoroalcoxy) acts as a protective barrier against aggressive chemicals and extreme temperatures.

Differences between FEP and PFA

Both materials are chemically inert, making them ideal for applications involving contact with corrosive substances and extreme environments.

Advantages of FEP/PFA encapsulated O-Rings

• Superior chemical resistance: They are compatible with most chemicals, including acids, solvents, and strong bases.
• Wide temperature range: They withstand temperatures from -60°C to 260°C (depending on the core material and encapsulation).
• Inert and sanitary compatibility: Approved by regulations such as FDA and USP Class VI, making them ideal for applications in the food and pharmaceutical industries.
• Reduced permanent deformation: The encapsulation prevents swelling and premature wear in aggressive media.
• Cost-effective alternative to solid PTFE: They offer similar chemical resistance at a more affordable price with better elastic recovery capability.

Common applications of FEP/PFA encapsulated O-Rings

• Chemical industry: In contact with strong acids, solvents, and highly corrosive fluids.
• Pharmaceutical and biotechnology industry: In production equipment and piping systems requiring inert materials approved by the FDA.
• Food industry: Sealing pumps, valves, and connections in contact with oils, dairy products, and other processed foods.
• Aerospace sector: In fuel and hydraulic fluid systems requiring high chemical resistance.
• Petrochemical industry: Applications in refineries and hydrocarbon pumping systems.

When to choose an encapsulated O-Ring instead of a conventional O-Ring?

Standard elastomer O-rings may not be sufficient when the following is required:

• High chemical resistance: If the O-ring comes into contact with highly corrosive substances or aggressive solvents.
• Greater thermal stability: When operating at extreme temperatures without losing mechanical properties.
• Lower permeability and absorption: In applications where contamination or material loss due to swelling is a concern.
• Greater durability and safety in critical environments: Industries such as pharmaceuticals or food require certified, contamination-free materials.

If you need more information about which type of encapsulated O-ring best suits your application, JIOrings can assist you.