Kalrez® FFKM Sealing Solutions

When critical processes demand maximum reliability, Kalrez® FFKM sealing solutions provide exceptional resistance to extreme temperatures, aggressive chemicals, and harsh operating environments.

Kalrez® perfluoroelastomer materials are trusted across chemical processing, semiconductor manufacturing, oil & gas, pharmaceutical, and aerospace industries where seal failure can lead to costly downtime, safety concerns, and lost production.

M&P Sealing helps customers identify the right Kalrez® solution for their application with expert technical support and fast quote turnaround.

What is Kalrez®?

Kalrez® is a family of premium perfluoroelastomer (FFKM) sealing materials engineered for the most demanding industrial applications. Combining the chemical resistance of PTFE with the sealing performance of elastomeric materials, Kalrez® delivers exceptional performance where conventional rubber compounds cannot.

Kalrez® materials are designed to withstand:

• Extreme temperatures
• Aggressive chemicals
• Plasma environments
• High-purity processes
• Critical sealing applications

Authorized Kalrez® Distributor

M&P Sealing is an authorized distributor of Kalrez® perfluoroelastomer products. We provide compound selection assistance, technical support, fast quotations, and access to genuine Kalrez® sealing solutions for critical industrial applications.

Why Choose Kalrez®?

Choosing the right sealing material directly impacts reliability, maintenance costs, and equipment uptime. Kalrez® FFKM materials are often specified when facilities require the highest level of sealing performance available.

Benefits

✓ Broad chemical compatibility

✓ Extreme temperature resistance

✓ Low compression set

✓ Long service life

✓ Reduced maintenance intervals

✓ Improved process reliability

✓ Lower total cost of ownership

Industries We Serve

Chemical Processing

Protect critical equipment from aggressive chemicals, solvents, acids, and corrosive media.

Oil & Gas

Maintain sealing integrity in challenging upstream, midstream, and downstream operations.

Semiconductor Manufacturing

Support high-purity processes with low contamination sealing solutions.

Pharmaceutical Processing

Reliable sealing solutions for demanding process and cleaning environments.

Kalrez® O-Rings

Kalrez® O-rings are used in some of the most demanding sealing applications across chemical processing, semiconductor manufacturing, oil & gas, pharmaceutical, and industrial markets. Manufactured from perfluoroelastomer (FFKM) materials, Kalrez O-rings offer outstanding resistance to aggressive chemicals, extreme temperatures, and long-term compression set.

High Performance Perfluoroelastomer Parts

M&P Sealing is an authorized distributor of Kalrez® products. It is a perfluoroelastomer that combines the elastic properties of fluorocarbon (FKM) with the outstanding chemical resistance and the high-temperature stability of polytetrafluoroethylene (PTFE). Kalrez®seals can be used for applications in high-temperature service up to approximately +316°C (600°F) and in intermittent service up to +343°C (650°F). Kalrez® O-Rings are available in inch and metric dimensions to ISO 3601, AS 568 A, BS 1806, and BS 4518, cords, foils, molded slabs, and custom molded parts.

Kalrez® parts last longer and seal more effectively than other elastomers in demanding processing environments. DuPont™ Kalrez® perfluoroelastomer parts (FFKM) resist over 1,800 different chemicals, while offering the high-temperature stability of PTFE (327°C).

They’re used in highly aggressive chemical processing, semiconductor wafer fabrication, pharmaceutical, oil and gas recovery, and aerospace applications. The long-term, proven performance of Kalrez® parts can mean less frequent seal changes, repairs, and inspections, increasing process and equipment uptime for greater productivity and yield.

Kalrez® parts and seals also help prevent semiconductor process contamination by reducing particulates, lowering extractables, and resisting degradation in harsh plasma. Kalrez® parts provide low outgassing in vacuum-sealing applications. FDA-compliant seals are also available for food, beverage, or pharmaceutical processes.

In addition to standard Kalrez® O-rings, we manufacture custom sealing components using our Flash Cutting Services for precision-cut gasket materials and specialty sealing applications. For applications requiring custom dimensions, M&P Sealing also supplies Industrial Gaskets, Metal Gaskets, and engineered sealing products for critical process equipment.

Kalrez® Material Properties

When searching for top-quality Kalrez® material, it’s essential to choose the best provider. M&P Sealing is proud to offer the highest-quality Kalrez® seals for various industrial applications. For those requiring exceptional chemical resistance, a broad temperature range, and superior compression set resistance, Kalrez® products are the ideal solution.

Key Features of Kalrez® Materials

Our Kalrez® materials are highly reliable, durable, and resistant to a wide range of chemicals, including acids, amines, and more. What sets our products apart from the competition is their long-lasting performance, even under the harshest operating conditions. This exceptional durability makes us a leading Kalrez® distributor.

While Kalrez® is often selected for the most aggressive operating environments, other materials such as PTFE Gaskets, Neoprene Gaskets, and specialty elastomer seals may provide a suitable solution depending on temperature, pressure, and chemical compatibility requirements.

Kalrez® Sheet Material

Kalrez® sheet material is used to manufacture custom gaskets and sealing components for applications requiring exceptional chemical resistance and high-temperature performance. Unlike conventional elastomer sheet materials, Kalrez® FFKM sheet products provide outstanding resistance to aggressive process chemicals, acids, solvents, hydrocarbons, and oxidizers.

M&P Sealing can help identify the appropriate Kalrez® material for custom gasket fabrication, sealing upgrades, and replacement components used in chemical processing, refining, pharmaceutical manufacturing, semiconductor production, and other demanding industries.

Kalrez® Cord Stock

Kalrez® cord stock allows maintenance teams and fabricators to create custom-sized O-rings for unique applications. Available in various diameters, Kalrez® cord stock provides outstanding resistance to chemicals, heat, and aggressive process media while offering flexibility for field fabrication and custom sealing solutions.

Kalrez® Chemical Compatibility

Kalrez® compounds are widely recognized for their exceptional chemical compatibility across thousands of chemicals and process media. Many compounds maintain sealing performance in strong acids, caustics, amines, solvents, hydrocarbons, oxidizers, and other aggressive chemical environments. Depending on the compound selected, Kalrez® materials can provide resistance to:

• Strong acids
• Caustics
• Amines
• Solvents
• Hydrocarbons
• Oxidizers
• Steam and hot water
• Process chemicals used in semiconductor manufacturing

Because different Kalrez® compounds are optimized for different operating environments, selecting the proper compound is important when evaluating long-term sealing performance and chemical compatibility.

Not Sure Which Kalrez® Compound You Need?

Choosing the right FFKM material can significantly improve seal life and equipment reliability. Our team can help you select the best Kalrez® compound based on your temperature, pressure, and chemical exposure requirements.

Need help identifying the right compound? Visit our FFKM Seals page for a broader comparison of perfluoroelastomer materials and available sealing solutions.

Kalrez® vs. Other Sealing Materials

Selecting the right sealing material is critical to achieving reliable performance, minimizing maintenance, and extending equipment life. While materials such as Viton®, EPDM, and PTFE each offer advantages for specific applications, Kalrez® FFKM provides the broadest combination of chemical resistance, high-temperature performance, and long-term sealing reliability. This makes Kalrez® a preferred choice for demanding environments found in chemical processing, semiconductor manufacturing, oil & gas, pharmaceutical production, and other critical industrial applications.

The comparison below highlights some of the key differences between Kalrez® and other commonly used sealing materials. While alternative materials may offer a lower initial cost, Kalrez® often delivers a lower total cost of ownership by reducing seal failures, minimizing downtime, and extending service intervals in harsh operating conditions.

*Kalrez® steam resistance varies by compound. Always confirm compatibility based on the specific Kalrez® grade, media, pressure, and operating temperature.

Common Kalrez® Applications

Kalrez® seals are commonly used in applications where conventional elastomers fail due to chemical attack, thermal degradation, or process contamination concerns. Industries rely on Kalrez® compounds for pump seals, valve seals, compressor seals, mechanical seals, semiconductor wafer processing equipment, pharmaceutical systems, chemical reactors, and refinery process equipment.

When Should You Upgrade to Kalrez®?

Upgrading to Kalrez® may be beneficial when seal failures are causing excessive downtime, maintenance costs, product contamination, or safety concerns. Facilities operating with aggressive chemicals, elevated temperatures, steam service, or rapid thermal cycling often achieve longer service life by switching from conventional FKM, EPDM, or general-purpose elastomers to Kalrez® FFKM compounds.

Frequently Asked Questions