Kalrez® O-Rings for Extreme Chemical and Temperature Applications
When failure is not an option, Kalrez® O-rings deliver exceptional sealing performance in the most demanding environments. Manufactured from advanced perfluoroelastomer (FFKM) compounds, Kalrez® seals provide outstanding resistance to aggressive chemicals, extreme temperatures, and harsh process conditions that cause traditional elastomers to fail. Kalrez® compounds are known for broad chemical resistance and continuous temperature capability reaching over 300°C (572°F) in select grades.
Many AS-568A, metric, and JIS O-ring sizes in commercial compounds may be available for immediate shipment from your local authorized Kalrez® perfluoroelastomer parts distributor. In addition, DuPont™ maintains inventories of all AS-568A, metric, and JIS O-ring sizes. Please contact us for current inventory status and estimated shipment dates. 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.
Why Choose Kalrez® O-Rings?
Kalrez® O-rings are engineered for applications where uptime, safety, and reliability are critical. Unlike standard elastomers, Kalrez® FFKM materials offer near-universal chemical compatibility and exceptional resistance to thermal degradation. Certain Kalrez® compounds can withstand more than 1,800 chemicals while maintaining sealing performance in extreme operating environments.
Benefits
✓ Exceptional chemical resistance
✓ High temperature capability
✓ Low compression set
✓ Extended service life
✓ Reduced maintenance costs
✓ Improved process reliability
✓ Available in AS568, metric, and custom sizes
While Kalrez® O-rings are among the most common sealing products, M&P Sealing also supplies a wide range of FFKM seals for valves, pumps, process equipment, and custom-engineered applications requiring exceptional chemical resistance and temperature performance.
Kalrez® O-Ring Applications
Kalrez® seals are commonly used in industries where aggressive chemicals, high temperatures, and stringent reliability requirements exist.
Chemical Processing
Protect equipment against acids, solvents, oxidizers, and corrosive media while minimizing downtime and maintenance.
Oil & Gas
Designed to withstand challenging upstream, midstream, and downstream operating conditions, including rapid gas decompression requirements for select compounds.
Semiconductor Manufacturing
Low contamination and low outgassing compounds help support critical wafer processing environments.
Pharmaceutical & Life Sciences
Selected compounds provide excellent purity and chemical resistance for demanding process applications.
High-Temperature O-Rings for Critical Applications
Kalrez® perfluoroelastomer materials combine the elasticity of rubber with chemical resistance approaching that of PTFE. Depending on compound selection, continuous service temperatures can exceed 315°C (599°F), with some formulations capable of operating near 327°C (620°F).
Resistant To:
- Strong acids
- Caustics
- Amines
- Solvents
- Hydrocarbons
- Oxidizers
- Plasma environments
- Steam and hot water (compound dependent)
For applications involving extreme pressure, aggressive chemicals, and elevated temperatures, engineered industrial gaskets and seals can provide additional sealing solutions beyond standard O-ring configurations.
Kalrez® O-rings are manufactured from advanced FFKM (perfluoroelastomer) materials designed for applications where conventional elastomers fail. Compared to standard rubber compounds, FFKM O-rings provide superior resistance to aggressive chemicals, extreme temperatures, and harsh process conditions. M&P Sealing supplies genuine Kalrez® seals in standard AS568, metric, and custom sizes for critical sealing applications across numerous industries.
Looking for a broader overview of Kalrez® sealing materials? Visit our Kalrez® FFKM Seals page to explore available compounds, material properties, chemical compatibility, and sealing solutions for critical applications.
High-Temperature and Chemical-Resistant O-Rings
When operating conditions involve aggressive acids, solvents, oxidizers, steam, or elevated temperatures, chemical-resistant O-rings are essential for maintaining equipment reliability. Kalrez® compounds are often selected as high-temperature O-rings because they retain sealing performance in environments that can rapidly degrade standard elastomers. This combination of chemical compatibility and thermal stability makes Kalrez® a preferred choice for demanding process industries.
Available Kalrez® O-Ring Compounds
Each Kalrez® compound is engineered for specific operating environments. Compare available compounds such as Kalrez® 4079, 6375, 6230, 7075, and 9100 to identify the best material for your temperature, chemical exposure, and process requirements.
Request a Quote for Kalrez® Replacement O-Rings
Many customers contact M&P Sealing when searching for Kalrez replacement O-rings for existing equipment. We can help cross-reference part numbers, identify compound requirements, and recommend suitable Kalrez® materials based on chemical exposure, temperature range, and operating conditions.
Kalrez® vs. Viton® O-Rings
| Property | Kalrez® FFKM | Viton® FKM |
|---|---|---|
| Chemical Resistance | Exceptional resistance to a broad range of aggressive chemicals | Very good resistance to fuels, oils, solvents, and many chemicals |
| Temperature Capability | Selected compounds can operate continuously at temperatures above 600°F |
Commonly used at temperatures up to approximately 400°F, depending on the compound |
| Base Polymer | Perfluoroelastomer, or FFKM | Fluoroelastomer, or FKM |
| Compression Set Resistance | Excellent in severe chemical and high-temperature service | Good for many standard industrial sealing applications |
| Typical Applications | Chemical processing, semiconductor, pharmaceutical, aerospace, refining, and critical process equipment |
Automotive, oil and gas, pumps, valves, hydraulic systems, and general industrial equipment |
| Service Life | Often provides longer service life in extreme environments | Reliable service life when used within its chemical and temperature limits |
| Cost | Higher initial cost | Lower initial cost |
| Best Choice When | Seal failure, chemical attack, contamination, or downtime cannot be tolerated |
The application requires strong chemical and temperature resistance at a more economical price |
Not sure whether Kalrez® or Viton® is the right choice? Our team can help evaluate operating temperatures, chemical exposure, pressure conditions, and service requirements to recommend the most suitable custom sealing solution for your application.
FFKM O-Ring Solutions for Critical Applications
Not all perfluoroelastomer O-rings are the same. Different Kalrez® compounds are engineered to optimize performance for specific applications, including chemical processing, semiconductor manufacturing, pharmaceutical production, refining, and oil & gas operations. Whether you need a standard AS568 seal or a custom-engineered solution, M&P Sealing can help identify the best FFKM seal for your operating environment.
Need Help Selecting a Kalrez® O-Ring?
Our sealing specialists can help identify the right compound, size, and material for your operating conditions.
In addition to Kalrez® O-rings, M&P Sealing manufactures and supplies a complete range of sealing products including metal gaskets, PTFE gaskets, heat exchanger gaskets, and custom-engineered sealing solutions for demanding industrial environments.