Teflon Encapsulated O-Rings
  • FEP PTFE Encapsulated O-Rings combine ultimate chemical resistance of FEP PTFE with the compressability of rubber or steel spring core.
  • Select from the various core options to satisfy your application
  • FEP PTFE stiffness can require custom gland design to maximize sealing by using the right amount of compression force to maintain a seal without over compressing which can shorten seal life.  FFKM and Spring Energized Lip Seals are alternatives.
  • Some diameters and cross sections are too small to produce.  FFKM O-Rings are and alternative.
  • Largest O-Ring inventory network in the world, manufacturer direct pricing with same day shipping available.

FEP type PTFE Fluoropolymers (performance plastics) offer excellent chemical and temperature resistance, but lack the resiliency of elastomers (rubber) required to maintain a quality seal.  Encapsulated and spring energized seals combine the best sealing features of plastics, elastomers and steel springs to increase chemical and temperature performance compared to most solid elastomers.  The main offsetting limitation is PTFE's stiffness that can require custom gland design to maximize sealing by using the right amount of compression force to maintain a seal without over compressing which can shorten seal life.  PFA type PTFE is also available for additional upper temperature resistance (up to +575° F short exposure) but not widely used due to reduced sealing performance.

Seal Type
and CPD#
Cross-Section Depiction Relative Price Highlight Features Temp
Range
Pressure
Range
Dynamic ApP. Slow Dynamic
App.
Excellent Chemical
Compat.
Static
App.
FEP Encapsulated
Silicone Core  
CPD# T1002
(PFA CPD# T1027)
 cross section $ Lowest Cost Most Readily Available -80o F To +400o F
+500o F*
Up to
1500 psi
No Yes Yes Yes
FEP
Encapsulated
Hollow Silicone Core
CPD# T1003

(PFA CPD# T1022)
(FEP FKM T1023)
(PFA FKM T1029)
cross section $$ Less Force Required to Compress -80o F To +400o F
+500o F*
Up to
500 psi
No Yes Yes Yes
FEP
Encapsulated
FKM (Viton®) Core  CPD# T1001

(PFA CPD# T1024)
cross section $$ Greater Chemical Resistance and Compression Set Resistance  -15o F To +400o F
+500o F*
Up to
1500 psi
No Yes Yes Yes
FEP
Encapsulated
Steel Spring Core    CPD# T1021

cross section $$$ Cryogenic Sealing Applications -420o F To +400o F
+500o F*
Up to 3000 psi with Vents No Yes Yes Yes
Steel Spring Energized PTFE (PTFE) Seal   Many Configurations cross section $$$ Extreme Temp Pressure Chemical Dynamic App Performance -420o F To +600o F Up to
60,000 psi
with Custom Design
Yes Yes Yes Yes
Solid FFKM Markez® Kalrez®
Many CPDs

View FFKM Page
cross section $$$ Improved Sealing Performance Longer Seal Life -50o F To +620o F Up to
25,000 psi With back-up rings
Yes Yes Yes Yes

*Temperature performance can vary significantly depending on application.

FEP Encapsulated Silicone O-Rings
CPD# T1002

FEP Encapsulated Silicone O-Rings
O-Ring with a FEP PTFE outer layer encapsulating a Silicone core.  The PTFE shell offers excellent chemical and temperature resistance while the Silicone core provides the resiliency needed to provide effective sealing.   Readily available is common USA and metric cross-sections and nearly unlimited diameters.   CPD# T1002 is FEP encapsulated Solid Silicone up to +500o F depending on application.  PFA type PTFE CPD# T1027 up to +575o F depending on application.
FEP Encapsulated Silicone Hollow Core O-Rings
CPD# T1003
FEP Encapsulated Silicone Hollow Core O-Rings
O-Ring with a FEP PTFE outer layer encapsulating a Hollow Silicone core.  The PTFE shell offers excellent chemical and temperature resistance while the Hollow Silicone core provides the resiliency needed to provide effective sealing.  The hollow core requires less force to compress the seal resulting in easier installation and improved sealing performance in some applications.  Readily available is common USA and metric cross-sections and nearly unlimited diameters. CPD# T1003 is FEP encapsulated Hollow Silicone up to +400o F depending on application. (PFA Hollow Silicone CPD# T1022)  (FEP Hollow FKM T1023)  (PFA Hollow FKM T1029)
FEP Encapsulated FKM (Viton®) O-Rings
CPD# T1001
(PFA CPD# T1024) FEP Encapsulated FKM (Viton) O-Rings
O-Ring with a FEP PTFE outer layer encapsulating a Solid FKM (Viton®) core.  The PTFE shell offers excellent chemical and temperature resistance while the FKM core provides the resiliency needed to provide effective sealing. The FKM core provides improved chemical and compression set resistance resulting in longer sealing life in some applications.  Less compressible than Silicone which can result in leaking issues in some applications.  Readily available is common USA and metric cross-sections and nearly unlimited diameters. CPD# T1001 is FEP encapsulated Solid FKM (Viton®) up to +500oF depending on application.  (PFA CPD# T1024)
FEP Encapsulated Steel Spring O-Rings
CPD# T1021
FEP Encapsulated Steel Spring O-Rings
O-Ring with a FEP PTFE outer layer encapsulating Stainless Steel Spring.  The PTFE shell offers excellent chemical and temperature resistance while the Steel Spring core provides the resiliency needed to provide effective Cryogenic Seal performance down -420o F.  Readily available is common USA and metric cross-sections and nearly unlimited diameters. CPD# T1021 is FEP encapsulated Steel Spring with Cryogenic Sealing down to -420o F and up to +500o F depending on application.
Steel Spring Energized PTFE (PTFE) Seals Steel Spring Energized PTFE (PTFE) Seals PTFE U-Cup style Lip Seal energized by a stainless steel spring.  Spring Energized PTFE Seals provide the best chemical resistance, widest temperature and pressure performance ranges of any plastic or elastomeric seal.  Spring Energized PTFE Seals can perform in Cryogenic Sealing temperatures of nearly absolute zero -420o F to 600o F depending on application. Pressures up to 3,000 psi and custom designs allow up to 60,000 psi.  A wide range of high performance plastics are available for specific application performance.  Designed for radial, face or custom seal configurations, as well as rotary, reciprocating and oscillatory motions depending on design.  Low friction and long service life in demanding application.  Wide range of spring energizing configurations based on applications. Seals are available in Rod and Piston Inside and Outside Pressure and unidirectional sealing configurations.  Great performance in compressed gas waterless fracking seals, LPG and Liquid Nitrogen seals.  Alternative to MSE® Seals, Bal Seals, Variseal®, OmniSeal®, FlexiSeal®.  Details at www.marcorubber.com
Solid FFKM Markez® Kalrez® O-Rings
View FFKM Page Solid FFKM Markez Kalrez  O-Rings
O-Rings and Custom Molded FFKM MARKEZ® KALREZ® Seals provide the ultimate chemical, temperature and sealing performance in demanding applications that are worth investing in high performance high cost seals.  Dozens of specialized compounds are available to maximize specific application performance with temperatures performance raging from -50o F to +620o F depending on application.  Details at www.marcorubber.com

FEP Tubing Features PFA Tubing Features
  • Wide range of chemical resistance
  • High corrosion resistance
  • Low compression set
  • Low coefficient of friction
  • Temp range of -60°C to 205°C
    (-76°F to 400°F) (500°F short exposure)
  • FDA, USP CLASS VI, Sanitary 3A Compliant
  • All benefits of FEP
  • Increased temp range of -60°C to +260°C
    (-76°F to 500°F) (575°F short exposure)
  • Higher mechanical strength
  • Increased stress and crack resistance
  • Potential sealing issues due to stiffness

COMMON FEP (PTFE) ENCAPSULATED AND STEEL SPRING ENERGIZED SEAL APPLICATIONS

  • Valve Stems
  • Flanges
  • Pumps
  • Swivels
  • Turbo Pumps
  • Joints
  • Turbo Expanders
  • Cryogenic seals
  • Waterless Fracking

ENCAPSULATED O-RING COMMON CROSS-SECTIONS AND DIAMETERS

FFKM and Lip Seal style Seals are available in Custom Cross Sections

O-Ring
Cross-Section
(inches)
O-Ring
Cross-Section
(mm)
Recommended
Compression
(inches)
Minimum
ID
Maximum
ID
0.070 +/- .005 1.78 0.017 0.500 10.000
0.075 +/- .005 1.91 0.018 0.500 10.000
0.094 +/- .005 2.40 0.022 0.600 15.000
0.103 +/- .005 2.62 0.024 0.600 Unlimited
0.110 +/- .005 2.79 0.025 0.600 Unlimited
0.118 +/- .005 3.00 0.025 0.750 Unlimited
0.125 +/- .006 3.18 0.025 0.750 Unlimited
0.139 +/- .006 3.53 0.025 0.750 Unlimited
0.148 +/- .006 3.76 0.027 0.950 Unlimited
0.157 +/- .007 3.99 0.027 1.150 Unlimited
0.177 +/- .007 4.50 0.031 1.500 Unlimited
0.197 +/- .008 5.00 0.035 1.500 Unlimited
0.210 +/- .008 5.33 0.038 1.500 Unlimited
0.225 +/- .008 5.72 0.040 1.500 Unlimited
0.250 +/- .010 6.35 0.043 2.500 Unlimited
0.275 +/- .010 6.99 0.043 2.500 Unlimited
0.295 +/- .010 7.49 0.047 2.750 Unlimited
0.315 +/- .012 8.00 0.050 3.000 Unlimited
0.331 +/- .012 8.40 0.057 4.000 Unlimited