M-Cor Inc. · U.S. manufacturer since 1987
FEP and PFA Encapsulated O-Rings
M-Cor manufactures ENCAP-O-SEAL® encapsulated O-rings and Cam and Groove gaskets in Montana. Each seal combines a fluoropolymer jacket for chemical resistance with a resilient elastomer core that supplies sealing force.
Choosing a seal for a new groove or replacing one in service? We can review your dimensions, process media, and operating conditions with you.
Sealing Products and Selection Guides
Our Mission and Purpose
Our mission and purpose is to help customers solve sealing challenges and make informed decisions, especially when standard designs or materials do not adequately address their requirements. Drawing on manufacturing experience dating to 1987, we provide engineering guidance and develop solutions—from O-ring sizing to custom geometries and high-performance material combinations—to meet customers’ application needs and quality expectations.
We listen carefully, apply sound engineering judgment and disciplined effort, and pursue innovation and continuous improvement to improve the solutions available to our customers. We communicate openly about design choices, expected performance, and the testing needed to confirm suitability. Technical honesty, a commitment to quality, and uncompromising integrity guide our work and commitments.
Manufacturing and Inspection
We extrude elastomer cord in-house and use optical measurement to verify finished ring dimensions. If your drawing calls for a specific tolerance, inspection record, or material certification, share it with us during quotation so we can confirm what we can supply.
Encapsulated O-Ring Questions
What are encapsulated O-rings made of?
An FEP or PFA jacket surrounds a silicone, FKM (including Viton®), or specialty elastomer core. Jacket selection depends on the process media and temperature. Core selection also depends on how much compression the assembly can apply.
Which tolerances apply to M-Cor encapsulated O-rings?
M-Cor cuts encapsulated rings to length and joins the ends. Use our cut-to-length tolerance guide when developing a drawing. M-Cor engineering must approve final tolerances in writing.
Where are encapsulated seals used?
Applications include static seals in semiconductor equipment, pharmaceutical and bioprocess systems, and chemical-transfer equipment. Suitability depends on the media, temperature, groove dimensions, and installation method.
Discuss Your Sealing Application
Send your drawing or groove dimensions, operating temperature, process media, and required quantity. If you’re replacing a seal that failed, tell us what you observed in service.