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FEP-Encapsulated O-Rings — Silicone Core

FEP-Encapsulated O-Rings — Silicone Core

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FEP-encapsulated O-rings combining a chemically resistant fluoropolymer jacket with an elastic silicone core for demanding laboratory, chemical and analytical sealing applications. Designed for aggressive media where direct elastomer exposure is undesirable, with selected metric sizes for fluid handling, electrochemistry and laboratory equipment.

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S4R FEP-Encapsulated O-Rings combine a chemically resistant FEP outer jacket with an elastic silicone core to provide reliable sealing in demanding laboratory and chemical environments. The continuous fluoropolymer contact surface limits direct exposure of the elastomer core to aggressive media, while the silicone core provides the resilience required for static sealing applications. Selected metric sizes are available for laboratory, analytical and electrochemical systems.

Key Features

✓ Continuous FEP fluoropolymer encapsulation
✓ Elastic silicone inner core
✓ Broad resistance to aggressive chemical media
✓ Low-friction, non-stick fluoropolymer contact surface
✓ Selected metric sizes for laboratory sealing applications
✓ FKM-core versions available on request

Typical Applications

• Chemical handling systems
• Electrochemical and battery research equipment
• Laboratory fluid transfer assemblies
• Analytical and process equipment
• Corrosive media sealing
• Laboratory equipment maintenance and replacement
Technical Specifications
Encapsulation Material FEP (Fluorinated Ethylene Propylene)
Core Material Silicone
Cross-Section Circular
Size Designation Inner Diameter × Cross Section (ID × CS)
Manufacturer-Stated Temperature Range −50 to +200 °C*
Appearance Translucent FEP Jacket / Red-Orange Silicone Core
Sales Unit 1 O-ring
Available Sizes & Dimensions
Inner Diameter (ID) Cross Section (CS) Outer Diameter (OD)
Ø5.00 mm 1.80 mm Ø8.60 mm
Ø6.00 mm 1.80 mm Ø9.60 mm
Ø8.00 mm 1.80 mm Ø11.60 mm
Ø10.00 mm 1.80 mm Ø13.60 mm
Ø12.50 mm 2.65 mm Ø17.80 mm
Ø15.00 mm 2.65 mm Ø20.30 mm
Ø20.00 mm 2.65 mm Ø25.30 mm
Ø25.00 mm 2.65 mm Ø30.30 mm
Ø30.00 mm 3.55 mm Ø37.10 mm
Ø40.00 mm 3.55 mm Ø47.10 mm
OD is calculated as ID + 2 × CS. Dimensions are nominal values. Verify dimensions and gland compatibility before critical installations.
Package Contents
1×
FEP-Encapsulated Silicone-Core O-Ring
Chemical & Installation Compatibility
FEP encapsulation provides broad chemical resistance while the silicone core supplies sealing resilience. Actual compatibility depends on the chemical medium, concentration, temperature, pressure and exposure duration. Encapsulated O-rings are less flexible than conventional elastomer O-rings and require appropriate groove geometry and careful installation. The −50 to +200 °C range is manufacturer-stated and should not be interpreted as a universal continuous operating range.

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