Encapsulated O-Ring Manufacturer (FEP & PFA)
M-Cor Inc. manufactures high-performance encapsulated O-rings engineered for semiconductor, pharmaceutical, aerospace, and chemical processing applications. Our FEP and PFA encapsulated seals combine the chemical resistance of PTFE with the resilience of elastomeric cores to deliver reliable sealing in the most demanding environments.
What Are Encapsulated O-Rings?
Encapsulated O-rings consist of a seamless outer jacket made from FEP or PFA fluoropolymer, surrounding a precision elastomer core. This hybrid construction provides the sealing force of rubber with the chemical resistance and low permeability of PTFE-based materials.
These seals are ideal for applications where standard elastomers fail due to aggressive chemicals, extreme temperatures, or purity requirements.
Key Advantages of Encapsulated O-Rings
- Exceptional chemical resistance to acids, solvents, and aggressive media
- High purity for semiconductor and pharmaceutical environments
- Wide temperature capability
- Low permeability and reduced contamination risk
- Excellent compression set resistance compared to solid PTFE seals
Engineering Limitations & Tolerance Considerations
Encapsulated O-rings are not molded components. They are manufactured using a precision cut-to-length and welding process. As a result, they do not conform to AS568 molded O-ring tolerances and instead follow RMA-based dimensional guidelines.
Material properties such as thermal expansion, residual stress, and measurement variability must be considered when specifying tight tolerances. Claims of extremely tight ID tolerances on large diameter encapsulated O-rings often ignore these physical realities.
M-Cor provides documented measurement data and offers post-production statistical sorting when ultra-tight tolerances are required.
Engineering Considerations
Understanding tolerances is critical when specifying encapsulated O-rings. These products follow RMA-based standards rather than molded AS568 tolerances.
Encapsulation Materials
FEP Encapsulated O-Rings
- Cost-effective solution
- Excellent chemical resistance
- Suitable for most industrial applications
PFA Encapsulated O-Rings
- Higher temperature capability
- Improved flex life
- Enhanced performance in critical applications
Elastomer Core Options
- Silicone (standard for flexibility and temperature range)
- FKM (Viton®) for enhanced chemical resistance
- EPDM (including PFAS-free options)
Applications
- Semiconductor manufacturing equipment
- Pharmaceutical processing systems
- Chemical handling and transfer systems
- Aerospace and vacuum environments
- Food and high-purity fluid systems
Why Choose M-Cor Encapsulated O-Rings
- Manufactured in the USA
- Over 37 years of sealing expertise
- Precision measurement and documented tolerances
- Full material traceability (SMART SEAL system)
- Custom engineering support for critical applications
Engineering Resources
- M-Cor Groove Assistant- Groove Aid Design for Engineers
- Monte Carlo Tolerance Simulation – Simulator for establishing yields
- Weight Calculator- Determine the weight of any extrusion Silicone, FKM, Tubing
- Encapsulated Overall Shore Hardness Calculator- Tool for determining hardness for force calculations
- A simple Mean Diameter Calculator
Frequently Asked Questions
Here is a link to our complete FAQ
What is the difference between FEP and PFA?
PFA offers higher temperature resistance and improved mechanical performance compared to FEP.
Are encapsulated O-rings suitable for high-purity applications?
Yes. They are widely used in semiconductor and pharmaceutical environments due to their low permeability and chemical resistance.