FEP Encapsulated O-Ring For Cryogenic Sealing

High-Performance Sealing Solution for Extreme Low-Temperature Applications FEP encapsulated O-rings are engineered for reliable cryogenic sealing in applications where conventional elastomer O-rings fail. Featuring a chemical-resistant FEP outer jacket combined with a spring-energized core, these O-rings deliver consistent sealing performance under extreme low temperatures, aggressive media, and high-pressure conditions. They are widely used in liquid nitrogen (LN₂), liquid oxygen (LOX), LNG systems, cryogenic valves, pumps, and vacuum equipment.

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Key Features & Benefits

Excellent Cryogenic Performance

FEP encapsulated O-rings maintain sealing integrity at temperatures as low as −420°F (−251°C) without embrittlement, making them ideal for ultra-low-temperature environments.

Superior Chemical Resistance

The FEP jacket provides outstanding resistance to chemicals, solvents, fuels, acids, and gases, ensuring long service life even in harsh media.

Spring-Energized Sealing Reliability

An internal stainless steel spring core compensates for thermal contraction and material creep, ensuring constant sealing force during temperature cycling.

product-484-483

Custom Sizes

Available

Custom diameters, cross-sections, and spring configurations are available without tooling costs, supporting both standard and non-standard groove designs.

Technical Specifications

Property	Description
Outer Jacket Material	FEP (Fluorinated Ethylene Propylene)
Core	Stainless steel spring-energized
Operating Temperature	−420°F to 400°F (−251°C to 205°C)
Pressure Capability	Up to 3000 psi (depending on size and application)
Friction Coefficient	Very low
Color	Standard transparent / custom colors available
Compliance Options	FDA, USP Class VI, RoHS, ASTM (upon request)

Typical Applications

Cryogenic valves and fittings

LNG loading arms and transfer systems

Liquid nitrogen and liquid oxygen equipment

Vacuum and ultra-high-vacuum systems

Chemical processing and semiconductor equipment

Aerospace and industrial gas systems

Why Choose FEP Encapsulated O-Rings for Cryogenic Sealing?

Traditional elastomer O-rings often harden, shrink, or crack at low temperatures. FEP encapsulated O-rings combine the elastic sealing force of a spring core with the chemical and thermal stability of fluoropolymers, providing a dependable sealing solution where failure is not an option.

They are especially suitable for applications involving:

Extreme temperature cycling

High chemical exposure

Long-term static or low-speed dynamic sealing

Frequently Asked Questions (FAQ)

What is the difference between FEP and PFA encapsulated O-rings?

FEP encapsulated O-rings offer excellent chemical resistance and cost efficiency, while PFA provides slightly higher temperature capability and improved flex life. FEP is widely used for cryogenic applications.

Are custom sizes available?

Yes. We manufacture custom FEP encapsulated O-rings in any size without mold or tooling charges.

Can these O-rings be used in dynamic applications?

They are primarily designed for static and low-speed dynamic sealing. Please consult our engineers for high-speed dynamic conditions.

Are certifications available?

FDA, USP Class VI, and other compliance options are available upon request depending on material selection.

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Looking for a reliable cryogenic sealing solution?
Contact us today to discuss your application requirements, custom sizes, or material recommendations. Our engineering team is ready to support your project.

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