Ace Seal is a global manufacturer of custom o-rings, seals, gaskets and other molded rubber & plastic components

At Ace Seal, we strive to help our customers get the material and products they need as soon as possible. We are aware of the long lead times for products that require Chemraz, Kalrez, and FFKM. Contact us today about alternative materials to Chemraz, Kalrez, and FFKM with reduced lead times.

FFKM O-Rings, Seals & Gaskets

  • FFKM O-Rings | FFKM Seals | FFKM Gaskets

We manufacture & distribute perfluoroelastomer o-rings, seals, and gaskets manufactured from a variety of FFKM materials. We can provide FFKM o-rings in standard sizes as well as seals and gaskets in custom configurations to match your unique specifications.

We manufacture FFKM o-rings, gaskets, and seals from three popular resins:

Order your AS568 standard O-rings today, or contact us to discuss your custom o-ring requirements.

FFKM O-Ring Products


Chemical Compatibility & Characteristics of FFKM 

If FFKM is not chemically compatible with your application, view our chemical compatibility chart to find the right material for your needs.

  • Abrasion resistance: Excellent
  • Acid resistance: Excellent
  • Chemical resistance: Excellent
  • Heat resistance: Excellent
  • Electrical properties: Excellent
  • Oil resistance: Excellent
  • Ozone resistance: Excellent
  • Water steam resistance: Excellent
  • Weather resistance: Excellent
  • Flame resistance: Good
  • Impermeability: Good
  • Cold resistance: Fair
  • Dynamic resistance: Poor
  • Set resistance: Poor
  • Tear resistance: Poor
  • Tensile strength: Poor

FFKM O-Rings for Vacuum Applications

If you need reliable seals for vacuum applications, very low contamination (both outgassing and particle emissions) or high temperature (392-572°F/200-300°C) operations that require prolonged out-backing or processing times, we recommend custom-made, cleanroom-manufactured FFKM o-rings. After manufacturing, these o-rings are plasma-vacuum cleaned and/or vacuum baked to eliminate outgassing and provide vacuum leak tightness. When so treated, these FFKM o-rings can be used in UHV-pressure applications.

FFKM Perfluoroelastomer Options

DuPont™ Kalrez®

O-rings, seals, and gaskets manufactured from DuPont™’s Kalrez® FFKM can resist more than 1,800 different chemicals and provide high temperature stability comparable to PTFE (≈621°F/327°C). Kalrez® FFKM is well-suited to use in the processing of highly aggressive chemicals, semiconductor wafer fabrication, pharmaceutical processing, oil and gas recovery, and aerospace applications.

Kalrez® o-rings, gaskets, and seals provide proven, long-term performance, meaning less frequent replacement, repair, and inspection and increased process and equipment uptime for improved productivity and overall yield.

By reducing particulates, lowering extractables, and resisting degradation in harsh plasma environments,  Kalrez® FFKM o-rings also help prevent contamination in semiconductor processing. This material also provides low outgassing in vacuum-sealing applications.

FDA-compliant Kalrez® FFKM materials are available for food, beverage, and pharmaceutical processing.


A member of the perfluoroelastomer polymer family—i.e., polymers of three or more monomers in which all hydrogen positions have been replaced with fluorine—Chemraz® provides outstanding resistance to heat and most chemicals and solvents. Its greatest benefits, however, may be its resistance to steam and significantly improved low-temperature properties.

The principle monomer of Chemraz® is tetrafluoroethylene (TFE), while its second and third perfluorinated monomers are proprietary to the material, and provide the balance of its beneficial characteristics.

Chemraz® is the most effective elastomer available for demanding oilfield applications. It provides excellent sealing performance when exposed to mixes of aggressive downhole chemicals, and is often specified by operators. Specially-formulated compounds can provide improved resistance to rapid gas decompression and abrasion, thereby reducing downtime for maintenance requirements.


Tecnoflon® PFR FFKM perfluoroelastomer o-rings provide the highest levels of performance among all FFKM elastomers. This material is resistant to nearly every class of chemicals, and some grades can resist temperatures over 572°F/300°C, making Tecnoflon® PRF FFKM the best choice for demanding sealing applications.

Unique specialty grades of Tecnoflo® have been developed to meet the stringent requirements of semiconductor, oil and gas, and chemical processing applications.

Contact Us for FFKM O-Rings, Seals & Gaskets

Ace Seal is your #1 source for FFKM o-rings, seals, and gaskets in standard and custom sizes and profiles. Request a quote today or contact us for more information on FFKM perfluoroelastomer materials.