top of page

Teflon Encapsulated O-Rings And Gaskets

A Superior Seal for Chemical Applications


TFE Encapsulated silicone and Viton™ gaskets for cam lock

couplings, encapsulated with FEP, are designed for use
with practically all chemicals, even in the toughest corrosive
environments. These gaskets combine the best qualities of
two materials to form a superior seal: Elastomer as the
core for resilience, and FEP on the outside for chemical
resistance. Not an envelope gasket, the elastomeric core
of every TFE Encapsulated gasket is fully encased.


TFE Encapsulated Features:


Excellent Chemical Resistance - FEP is chemically inert to
almost all industrial chemicals and solvents, even at elevated
temperatures and pressures

Resiliency - Elastomeric cores provide an assured tight seal

Wide Temperature Range - Continous service temperatures from

-75°F (-60°C) to +400°F (+205°C) for FEP & silicone,

-15°F (-26°C) to +400°F (+205°C) for FEP & Viton™



Low Coefficient of Friction - Lubricious surface of FEP for
easier gasket insertion

Nonstick Surface - Almost all substances release easily so
cleanup is easier

Universal Seal - Handles practically any fluid. Eliminates
matching the myriad elastomeric formulations with a specific requirement

Sanitary - Eliminates contamination associated with elastomeric gaskets.

White Gaskets - Introducing our latest line of TFE
Encapsulated silicone core gaskets encapsulated with
FEP. With their clean, sanitary appearance, our white 
gaskets are ideal for pharmaceutical applications. They are available in coupling sizes from 1/2" through 3" for 

temperature ranges from -75°F (-60°C) to +400°F (+205°C).

General Specifications

Core Materials

Silicone to ZZ-R-765 FDA Compliant -  ideal for
pharmaceutical, food and beverage applications.
(Available in red or white)

Viton™ - Ideal for overall chemical resistance.


Solid .020 wall of virgin FEP made from resin which meets
or exceeds the requirements of L-P-389A and ASTM-D-2116.
FDA compliant and USP Class VI approved.

Sizes (Silicone Core Part Numbers Shown)


Square Cross-Section Ring Seals. Same as FEP above plus:

• Retrofits into standard O-Ring groove
• Larger sealing surface
• Less squeeze required for sealing
• Effects more positive seal
• Rectangular cross-section also available

• Solid silicone & Viton™ core

For part numbers of gaskets with Viton™ cores, substitute V for S.




Cosmetic Industry:

Transferring perfumes and oils
Blending and batching oils and
greases for soap

Paints and Dyes:

Mixing color pigments


Blending raw materials

Bulk Liquid Transfer:

Mining slurries, agricultural chemicals, brewing

Kingseal Silicone, Viton™ or EPDM O-Rings encapsulated

with FEP of PFA are designed to address the growing problem of sealing in the most hostile chemical and temperature environments. The TFE encapsulated O-ring combines the best qualities of two materials, FEP and PFA on the outside with its chemical inertness and an elastomer on the inside for resilience. This unique combination forms a highly effective, long-lasting seal for the most demanding applications.


Kingseal TFE Encapsulated O-rings are available in over 60 standard cross-section

sizes from .63" (1.60mm) to 1-1/4 (31.75mm). Standard TFE encapsulated O-rings

are comprised of FEP over silicone, Viton™, or EPDM and can be used in temperatures

from -75°F to +400°F (-60° to +205°C) depending upon the choice of elastomer.

For high-temperature applications to 500°F (260°C), our TFE encapsulated O-ring

is made with PFA over silicone. PFA has higher mechanical strength than FEP or TFE

at elevated temperatures and has excellent crack and stress resistance.



Teflon encapsulated O-Rings are primarily used as a static seal (axial or radial).

Standard TFE Encapsulated O-Rings in round or square cross-section are manufactured

in sizes to AS 568A industry standards. Non-standard sizes are also available for custom

designs, along with a full range of metric (ISO) sizes.



FEP-encapsulated O-Rings (Fluorinated Ethylene Propylene):


• Outstanding chemical and corrosion resistance

• Low coefficient of friction

• Resilience with choice of elastomeric cores

• Low compression set

• Temperature range: -75°F to 400°F (-60°C to 205°C)

• Unlimited sizes (No tooling charges)

• Solid and hollow silicone, Viton™ cores

• FDA compliant materials available

• USP Class VI approved materials available


PFA-encapsulated O-Rings ( Perflouroalkoxy).

Same as FEP above but with these added benefits:


• High-temperature applications to 500°F (260°C)

• Higher mechanical strength
• Better flex-life
• Low vapour permeation
• Excellent stress and crack resistance
• Longer wearability


Typical Applications


TFE Encapsulated Gaskets provide a superior seal for any bulk

liquid transfer in manufacturing, distribution of storage.


Chemical Processing:


From trucks to storage
From storage to process areas


Petroleum Industry:

Deliveries to service stations

Oil canning

Blending grease and oil

Mixing oil additives


Rubber and Plastics:

Blending liquids and resins


Printing and Marking Equipment:

Hose connector


Viton™ is a registered trademark of Dupont Performance Elastomers

Teflon™ is a registered trademark of Dupont.


bottom of page