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SIMRIZ® – FFKM Perfluoroelastomer O-Rings

FFKM - Structural Formula

Designed for thermal stability and nearly universal protection against the chemical elements, Freudenberg Sealing Technologies’ proprietary family of Simriz® Perfluoroelastomer compounds offers outstanding sealing performance.

Simriz® stands out with its broad chemical stability, like PTFE, combined with the rubbery-elastic qualities of an elastomer. Simriz® FFKM products are used wherever extreme safety standards apply and high maintenance as well as repair expenditures exceed the costs of the seals. Freudenberg is vertically integrated back to the monomers to provide unparalleled material performance, cost competitiveness and speed of delivery. In addition, many popular compounds and AS568 sizes are in stock.

Simriz® O-Ring Family

Benefits for Freudenberg Sealing Technologies customers:

  • Without equal – patented cross-linking system provides superior performance beyond the limits of other competitor FFKM products.
  • Vertical integration – Freudenberg is the only vertically integrated O-ring manufacturer.
  • Cost-efficient – as the only vertically integrated O-ring manufacturer down to the monomers, Freudenberg can provide the most cost-efficient FFKM O-rings.

Thermal and Chemical Resistance of FFKM Elastomers:

Simriz® perfluoroelastomer compounds are designed for a variety of industrial applications, including chemical processing and other heavy industries. Custom molded shapes are also available.

Let Freudenberg advise you on either a cost-effective solution for your application or a single material that can handle all your needs, utilizing Freudenberg’s proprietary curing system.

Find your Simriz® solution here

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Success Story: Quick FFKM Tooling in Action

Embark on a journey through Freudenberg Sealing Technologies' Simriz® FFKM compounds, learn about our quick tooling solutions. Explore how our quick tooling capabilities ensure the reliable and timely supply of FFKM seals for critical applications, exemplified by our success with a major American seed and agricultural chemical company. Discover how our tailored solutions and vertically integrated supply chain, coupled with patented FFKM materials like Simriz® 498, swiftly surpass industry standards, meeting stringent quality and performance demands.

Premium FFKM Material Performance

Rolling Diaphragms and Simriz® O-Ring side by side.

With a broad lineup of products, the Simriz® family of FFKM compounds is up to the challenge for all your sealing needs. From standard O-Rings to customized shapes, sizes and applications, Simriz® FFKM compounds are designed and engineered to accommodate a wide variety of industrial requirements and are available in custom-molded shapes to provide even greater design flexibility.

  • O-Rings
  • Oval Rings
  • Square Rings
  • D-Rings -OD/ID
  • Diaphragms
  • Gaskets
  • Custom-molded parts
  • Micro Parts

Best of Both Worlds

In addition to traditional compounds, Freudenberg has developed a patented crosslink technology that combines the chemical resistance of peroxide-based products with the increased thermal stability of triazine curing systems. Seals using the innovative solution can withstand temperatures up to 325°C (617°F), while simultaneously providing extremely broad chemical resistance against amines and strong acids—as well as outstanding performance under steam and hot water exposure.

As a result, customers no longer need to choose between chemical and thermal properties in severe applications that require both. Freudenberg’s proprietary curing technology provides all the benefits, without any compromises, in a single compound. It’s the ultimate FFKM material.

Request FFKM Application Information now

Adding Up the FFKM Simriz® Benefits

Freudenberg provides unique sealing solutions tailored to customer specifications with exceptional chemical resistance and superior thermal properties.

  • Reliable Performance: Combining the resilience of an elastomer with the chemical resistance approaching that of PTFE, Simriz® materials provide the ultimate performance in harsh environments. In safety critical applications, high-quality O-rings, seals and diaphragms can mean the difference between success or the premature failure – and high maintenance/replacement costs – of key equipment.
  • Excellent Service: We deliver high-quality solutions, when and where you need them – teaming local support with global capabilities. To help expedite orders and reduce complexity, we stock AS568 sizes and many metric sizes in our most common FFKM compounds.
  • Cost-Efficient Pricing: Freudenberg is the only fully vertically integrated O-ring manufacturer, supplying the base monomers and polymers, additives and final compounds. Not only does this cut out the middlemen, but it also results in significant cost savings, faster development times, greater design flexibility and less complexity for suppliers. For customers, the combined benefits add up quickly to improve bottom-line profitability.

Performance Plus: FKM & FFKM Material

Developed in the 1950s, fluoroelastomer (FKM) have long been used in harsh applications that require strong thermal and/or chemical properties. FFKM compounds build on and exceed these properties to withstand and maintain their performance in even more extreme conditions – with the chemical resistance approaching that of PTFE and top-end temperatures of continuous 325°C (617°F) for high temperature grades.

Thanks to their expanded capabilities, FFKM offers more versatility than base FKM across a range of uses and industries, including Aerospace, Chemical Processing and Food & Beverage to Health Technology, Oil & Gas, Pharmaceutical, Power Generation and Oil & Gas Equipment.

Customers need to consider several application-specific factors when deciding whether to use an FKM- or FFKM-based sealing system. FFKM, for example, should be used for the following conditions…

  • Temperature ranges up to +325°C (617°F)
  • Aggressive chemical requirements such as amines, strong acids and critical solvents
  • Simultaneous demands of high temperatures and harsh chemicals
  • Explosive decompression (ED) or clean- and sterilization-in-place (CIP/SIP) processes
  • Safety critical and warranty sensitive requirements, such as rail car applications

The good news is that Freudenberg offers a full suite of both FFKM and FKM compounds to best meet your performance and cost requirements. And our customer support teams will help you choose the right solution for your application.

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The Simriz® Advantage

Watch this engaging webinar that will take you deep into the world of FFKM Seals.

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    Related Documents

  • Brochures 66-plus 67-minus


    FFKM Simriz® High Performance FFKM Material Portfolio for Extreme Conditions

    Your benefits from a single source: In-depth material expertise in premium FFKM materials; Many years of applications experience and use in a wide range of industries; In-house R&D and production of high-performance materials with relevant approvals, such as FDA, USP Class VI and AMS7257; ...

    English | PDF | 1121 KB

  • Solutions Sheets 66-plus 67-minus


    Simriz® 134

    Simriz® 134 performs well in a wide variety of harsh chemicals. Its outstanding resistance against rapid gas decompression (RGD) makes Simriz® 134 the perfect match for high pressure gas applications.

    English | PDF | 233 KB


    Simriz® 481 - Low Temperature FFKM Material

    Simriz® 481 performs well in a wide variety of harsh chemicals. Its outstanding low temperature performance makes the Simriz®481 the perfect match for nearly every application in the chemical process industry especially where low temperatures are expected.

    English | PDF | 188 KB


    Simriz® 484 - For Food & Beverage Applications

    Simriz® 484 performs well in a wide variety of harsh chemicals as well as at high temperatures. Also Simriz® 484 is FDA compliant and USP class VI compliant, making it the perfect match for any Food & Beverage and Pharmaceutical application.

    English | PDF | 159 KB


    Simriz® 485 - General Purpose FFKM Material

    Simriz® 485 performs well in a wide variety of harsh chemicals as well as under overheated steam and hot water conditions. Its outstanding performance combined with the cost efficient price structure makes Simriz® 485 the perfect match for nearly every application in the chemical process industry.

    English | PDF | 221 KB


    Simriz® 486CP

    Designed for thermal stability and nearly universal protection against chemical attack, Freudenberg’s proprietary family of Simriz® perfluoroelastomer compounds offer premier sealing performance. Simriz® 486CP was specifically developed to be a cost-effective, highperformance compound for semiconductor applications. Simriz® 486 offers excellent plasma resistance and low particulation in a wide range of plasma environments.

    English | PDF | 761 KB


    Simriz® 495 - General Purpose FFKM Material

    Simriz® 495 performs well in a wide variety of harsh chemicals as well as under overheated steam and hot water conditions. Especially its outstanding performance in strong acids and oxidizers makes Simriz® 495 the perfect match for nearly every application in the chemical process industry.

    English | PDF | 218 KB


    75 Simriz® 495

    The high-performance material 75 Simriz® 495 specially developed by Freudenberg Sealing Technologies offers universal chemical resistance, even to amines, and is therefore ideally suited for applications in the chemical industry.

    English | PDF | 132 KB


    Simriz® 498 - The Ultimate FFKM Material

    Simriz® 498 is the ultimate FFKM material. Its unique patented material structure provides an outstanding long-term performance in nearly every environment.

    English | PDF | 209 KB


    Simriz® 501 and Z7257 - Permium Aerospace

    With even greater performance results than the well-known Simriz® Z7257, Simriz® 501 marks our next generation Aerospace Simriz® material while providing continued availability of Simriz® Z7257.

    English | PDF | 221 KB


    Simriz® 502 - For Oil & Gas Applications

    Simriz® 502 is the ultimate FFKM material designed to fit the highly demanding requirements of oil & gas applications and the CPI market.

    English | PDF | 134 KB


    Simriz® 508 and 508CP

    Designed for thermal stability and nearly universal protection against chemical attack, Freudenberg’s Simriz® 508 and 508CP perfluoroelastomer compounds offer premier sealing performance. Simriz® compounds approach PTFE chemical resistance while resisting high temperatures up to 325°C. The ultimate FFKM material designed to fit the highly demanding requirements of Semi-Con applications like Wet Processing, HDPCVD, PECVD and remote plasma cleaning.

    English | PDF | 613 KB

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