FFKM O-rings and Seals

Chemical-Resistant Perfluoroelastomer (FFKM)

Our peroxide-cured FFKM formulations are developed specifically where broad-spectrum chemical resistance is the primary requirement. While the upper temperature ceiling is lower compared to high-temperature FFKM grades, these compounds deliver a highly cost-effective sealing solution without compromising on chemical inertness making them well-suited for petrochemical operations, semiconductor facility maintenance, and any process involving aggressive organic solvents.

We stock multiple formulations to address varying application demands, and our team can develop tailored compound solutions where standard grades fall short. All materials are available in both finished component and semi-finished stock form.

Chemical-Resistant FFKM - Equivalent to Kalrez® 6375 & Chemraz® 505

Thermal Resistant Perfluoroelastomer

Our nitrile-cured FFKM formulations are engineered for applications where elevated temperature performance is the critical requirement. Building on the broad chemical resistance inherent to all FFKM materials, these compounds push the upper service limit to 330°C providing a meaningful performance advantage over standard peroxide-cured grades in thermally demanding environments.

These formulations are particularly well-suited to high-temperature process sealing in petrochemical plant operations, semiconductor process equipment, and applications involving organic solvents at elevated temperatures where standard FFKM compounds would be pushed beyond their reliable service range.

As with our full FFKM range, we offer multiple standard formulations to match varying process conditions, alongside a custom compounding service for applications with specific or unusual requirements. All grades are available in finished component and semi-finished stock form.

Thermal resistant FFKM. Equivalent to Kalrez® 4079

Ultra-Purity Perfluoroelastomers

Ultra-purity FFKM compounds are developed for the most stringent process environments, where contamination control, extractables, and material integrity are held to the highest possible standard. These formulations go beyond standard FFKM performance combining exceptional chemical stability with specialised processing to meet the purity demands of semiconductor fabrication, pharmaceutical manufacturing, medical device production, and advanced analytical application

Key Performance Characteristics:

• 1. Exceptional Chemical Stability
  These perfluoroelastomers demonstrate outstanding chemical resistance, capable of withstanding virtually all process chemicals including concentrated acids, strong alkalis, and aggressive solvents.
• 2. Extremely Low Extractables
  High-purity FFKM compounds release extremely low levels of extractables in service, making them essential for processes where contamination control is critical including semiconductor fabrication, medical device manufacturing, and pharmaceutical production.
• 3. High-Temperature Operational Stability
  These elastomers maintain stable performance at continuous service temperatures of 300°C and above, with no significant deterioration in mechanical or sealing properties under sustained thermal exposure.
• 4. Very Low Gas Permeability
  High-purity perfluoroelastomers exhibits very low gas permeability, making it well-suited to vacuum process environments and any application where reliable gas-tight sealing is a fundamental requirement.
• 5. Strong Mechanical Performance-
  Perfluoroelastomers offer high tensile strength, excellent elasticity, and strong wear resistance, delivering consistent and reliable performance even under demanding physical operating conditions.
• 6. Broad Temperature Range Capability
  Beyond their high-temperature capability, these elastomers also hold up well in cold environments keeping their flexibility and sealing effectiveness across a wide range of operating temperatures.
• 7. Plasma Erosion Resistance
  These materials stay stable and intact when exposed to plasma, resisting erosion effectively which is especially important in plasma etching and other semiconductor process equipment.
• 8. High-Purity Processing
  Each batch goes through dedicated cleaning procedures during manufacture to ensure the final product meets the purity levels required by demanding process applications.

For the most critical process environments, we offer a range of ultra-purity FFKM formulations tailored to specific semiconductor process steps and high-cleanliness industrial applications. All materials are available in finished component and semi-finished stock form. Contact our technical team to discuss compound selection or request material certification documentation.

Ultra-purity, low extractable perfluoroelastomer FFKM. Equivalent to Kalrez® 8900, 9100, Chemraz® 629

Low Compression Set Perfluoroelastomer :

Low Compression Set FFKM formulations are designed with several performance advantages that make them the preferred choice in long-term sealing application

Key Performance Advantages:

• 1. Sustained Durability & Shape Retention
  These compounds resist material fatigue and permanent set over extended service periods, retaining their original geometry and elastic response far longer than standard FFKM grades. The result is a measurable extension in usable seal life and a reduction in replacement frequency.
• 2. Consistent Long-Term Sealing Integrity
  With their low compression set characteristics, these materials retain effective sealing contact over time, reliably preventing liquid or gas leakage in both static and dynamic sealing applications.
• 3. Performance Across a Wide Temperature Range
  With the ability to maintain consistent performance across a wide temperature range, these elastomers are well-suited to applications operating in both high and low temperature extremes.
• 4. Broad Chemical Resistance
  These materials offer excellent chemical resistance, standing up well to a broad range of aggressive substances — making them a dependable choice for chemical processing and petroleum industry applications.
• 5. High Elasticity & Rapid Recovery
  With outstanding elasticity and recovery, these elastomers spring back to their original form quickly even after repeated compression cycles.
• 6. Broad Industry Applicability
  Low compression set FFKM seals are widely adopted across the automotive, electronics, aerospace, and medical industries wherever long-term sealing reliability under sustained load is a core requirement These properties make low compression set FFKM an essential material choice in applications where sealing performance must be maintained over the long term without scheduled intervention. All materials are supplied in both finished component and semi-finished stock form.

Low compression set, Thermal resistant FFKM. Equivalent to Kalrez® 7075

Food and Medical Grade

Food and medical grade FFKM formulations are developed to satisfy the rigorous material safety and purity requirements of regulated industries. These compounds are fully compliant with internationally recognised standards governing direct contact with food products and medical or pharmaceutical substances including FDA (Food and Drug Administration) regulations and USP Class VI (United States Pharmacopeia) classification providing documented assurance of their safety, biocompatibility, and suitability for use in sensitive contact applications.

Key Characteristics:

• 1. Extremely Low Extractables
  These formulations release negligible levels of extractable substances during service, a critical requirement in food processing and medical applications where even trace contamination of the product or process stream is unacceptable.
• Broad Chemical Resistance
  Food and medical grade FFKM withstands exposure to a wide range of process chemicals including acids, alkalis, solvents, and aggressive cleaning and sterilisation agents — maintaining full integrity through repeated CIP (clean-in-place) and SIP (sterilise-in-place) cycles without swelling, cracking, or loss of sealing performance.
• High-Temperature Stability
  These compounds retain their physical and chemical properties at elevated temperatures, making them reliable for use in autoclave sterilisation, steam cleaning, and other high-temperature hygienic processing conditions without degradation or dimensional change.
• Confirmed Biocompatibility
  Formulated to be non-toxic and non-irritating to human tissue, these materials demonstrate good biocompatibility — qualifying them for direct use in medical devices, implantable equipment seals, pharmaceutical contact components, and diagnostic instrumentation.
• Strong Mechanical Performance
  High tensile strength, excellent elasticity, and good wear resistance ensure that sealing performance and dimensional stability are maintained throughout extended service life — even under conditions involving frequent assembly, disassembly, or mechanical loading.
• Low Gas Permeability
  The inherently low gas transmission rate of these FFKM grades ensures reliable gas-tight sealing in food packaging equipment, pharmaceutical containment systems, and medical devices where maintaining a controlled atmosphere or preventing contamination ingress is essential.
• Availability & Compliance
  All materials are available in finished component and semi-finished stock form, with full compliance documentation available on request. Contact our team to discuss grade selection or to request FDA and USP Class VI certification records.

Food Grade Perfluoroelastomer — FDA Grade FFKM

The U.S. Food and Drug Administration (FDA) has established a specific regulatory framework governing the use of rubber materials in food-contact applications, set out under FDA CFR 21.177.2600. This regulation carries both U.S. legal standing and broad recognition as an international reference standard for food-grade rubber compliance.

The regulation is structured across multiple sections: Sections A through D define the general material requirements for rubber products intended for repeated food contact use, while Sections E and F set out the permissible extractable limits for rubber seals in contact with aqueous and fatty food media. Extractable testing is conducted using water and n-hexane as reference solvents, with defined acceptance thresholds that the finished material must satisfy.

It is important to note that the FDA does not issue product-level approvals under CFR 21.177.2600. Instead, the regulation provides a compliance framework that manufacturers and end users reference when specifying and selecting food-contact rubber materials. Compliance is formally demonstrated when the final product manufacturer issues an FDA conformance certificate supported by extractables test data.

It should also be understood that a component manufactured from an FDA-compliant rubber material is not automatically suitable for every food-contact application. Technical suitability for a specific process taking into account temperature, media, pressure, and contact duration must be evaluated independently of material compliance status.

Food and medical grade perfluoroelastomers, by virtue of its outstanding chemical inertness, very low extractables, and thermal stability, is widely adopted across food processing, hygienic equipment, and food safety applications. We supply FDA-compliant FFKM formulations in both finished component and semi-finished stock form, with supporting compliance documentation available upon request.

FDA compliant FFKM

Medical Grade Perfluoroelastomers

Medical grade FFKM compounds must satisfy the requirements of the United States Pharmacopeia (USP) Class VI one of the most stringent biocompatibility frameworks applied to polymer materials used in medical and pharmaceutical contact applications. Our medical grade FFKM formulations have been independently tested and verified by accredited third-party laboratories, confirming compliance with USP Chapter 87 (equivalent to ISO 10993-5) and USP Chapter 88 (equivalent to ISO 10993-6, -10, and -11), and meeting all USP Class VI polymer testing requirements in full.

Key Characteristics:

• Regulatory Compliance with Food and Medical Standards
  These materials comply with the strict regulatory requirements of the food and medical industries including FDA (U.S. Food and Drug Administration) and USP Class VI standards ensuring they are safe and dependable for direct contact with food products and medical or pharmaceutical substances.
• Extremely Low Extractables
  Medical grade FFKM releases negligible extractable substances during service. In regulated pharmaceutical and medical applications, even trace levels of leachables can compromise product integrity or patient safety making this a fundamental material requirement, not a desirable feature.
• Chemical Resistance
  These rubber materials withstand continuous exposure to a wide range of process chemicals including strong acids, alkalis, organic solvents, and aggressive cleaning and sterilisation agents maintaining full physical and sealing integrity through repeated CIP and SIP cycles.
• High-Temperature Stability
  Medical grade FFKM retains its mechanical and chemical properties under sustained elevated temperatures, performing reliably through autoclave sterilisation, steam cleaning, and other thermal processing conditions without dimensional change, softening, or degradation.
• Confirmed Biocompatibility
  Formulated to be non-toxic and non-irritating to human tissue, these elastomers demonstrate strong biocompatibility across standard test protocols qualifying them for sealing and contact components within medical devices, surgical instruments, pharmaceutical processing equipment, and diagnostic systems.
• Strong Mechanical Performance
  High tensile strength, excellent elastic recovery, and good wear resistance ensure consistent sealing force and dimensional stability over extended service life, even under conditions involving repeated mechanical loading or frequent assembly cycles.
• Low Gas Permeability
  The inherently low gas transmission characteristics of these compounds ensure reliable containment and gas-tight sealing in pharmaceutical isolators, medical gas systems, sterile filling equipment, and other applications where atmospheric control is critical.
• Hot Water & Steam Resistance
  These formulations withstand prolonged exposure to hot water and high-pressure steam without swelling, cracking, or loss of sealing performance — an essential property for equipment subjected to frequent or continuous sterilisation cycles.
• Easy to Clean & Maintain
  A smooth, non-porous surface finish resists particulate adhesion and biofilm formation, making these seals straightforward to clean and helping equipment meet the hygiene standards required in food processing, pharmaceutical manufacturing, and medical device production environments.

Due to their outstanding chemical and physical properties, food and medical grade perfluoroelastomers are widely used across food processing, pharmaceuticals, medical equipment, and any application where cleanliness and safety are non-negotiable. We supply perfluoroelastomers that meet both FDA and USP Class VI standards.

KAF Vulcan medical grade perfluoroelastomers also satisfy food grade requirements, making them a practical and versatile choice for medical devices, pharmaceutical processing, and any application where biocompatibility is a key consideration. All materials are available in finished form.

USP CI VI compliant FFKM