When sealing performance is non-negotiable, material selection matters. In industries where extreme temperatures, aggressive chemicals, and long service life are the norm, standard elastomers simply don’t hold up. That’s where DuPont™ Kalrez® comes in.

Kalrez® is a perfluoroelastomer (FFKM) engineered to deliver exceptional chemical resistance, thermal stability, and durability in the most demanding environments. At M&P Sealing, Kalrez® is frequently specified for applications where failure is not an option and for good reason.

What Makes Kalrez® Different?

Kalrez® sits at the top of the elastomer performance pyramid. Unlike traditional materials such as Viton® (FKM) or EPDM, Kalrez® combines the flexibility of rubber with the chemical resistance of PTFE.

Key performance advantages include:

• Broad chemical compatibility
  Kalrez® resists nearly all aggressive chemicals, including acids, bases, solvents, amines, and oxidizers.

• Extreme temperature resistance
  Many Kalrez® compounds perform continuously at temperatures up to 600°F (316°C), with short-term excursions even higher.

• Low compression set
  Seals maintain their shape and sealing force over time, reducing leakage and downtime.

• Long service life
  Extended maintenance intervals lower total cost of ownership—even when the upfront material cost is higher.

Common Industries That Rely on Kalrez®

Kalrez® is not an everyday elastomer—and that’s intentional. It is designed for industries where performance outweighs material cost.

Chemical Processing

In chemical plants, seals are exposed to corrosive media, pressure cycling, and high temperatures. Kalrez® delivers reliable sealing in pumps, valves, mixers, and reactors where other elastomers degrade or swell.

Semiconductor Manufacturing

Ultra-clean environments demand materials with low outgassing and exceptional purity. Kalrez® is widely used in wafer fabrication equipment, vacuum systems, and gas delivery systems.

Oil & Gas

Downhole and refining applications require materials that can survive hydrocarbons, sour gas, and extreme heat. Kalrez® maintains sealing integrity where lesser materials harden or crack.

Aerospace & Advanced Manufacturing

Precision systems operating under harsh thermal and chemical conditions benefit from Kalrez®’s consistency and durability.

Kalrez® vs. Other Elastomers

Understanding when Kalrez® is necessary—and when it isn’t—is critical.

Kalrez® is not always the right choice but when applications push the limits of temperature, chemistry, and uptime, it is often the only viable option.

Why Specification Matters More Than Brand Name

Kalrez® is not a single compound, it’s a family of formulations, each engineered for specific performance needs. Selecting the wrong grade can lead to premature seal failure or unnecessary overspending.

At M&P Sealing, we help customers:

• Match Kalrez® compounds to exact chemical exposures

• Evaluate temperature and pressure requirements

• Compare Kalrez® to alternative high-performance materials

• Optimize seal design for longevity and performance

In some cases, a properly selected alternative can deliver equivalent performance at a lower cost. In others, Kalrez® is the clear winner. The key is understanding the application not just the material name.

How M&P Sealing Supports Kalrez® Applications

M&P Sealing works closely with customers across chemical, industrial, and advanced manufacturing markets to ensure sealing solutions perform as expected long after installation.

Our team provides:

• Material selection support

• Application reviews

• Seal cross-reference and sourcing

• Cost-performance evaluations

• Local expertise with national supplier access

Whether you’re specifying Kalrez® for a new system or troubleshooting a challenging application, having the right partner makes all the difference.

DuPont™ Kalrez® is engineered for environments where failure is costly, dangerous, or unacceptable. While it may not be the right solution for every application, it remains a critical material for industries that demand the highest level of sealing performance.

If you’re evaluating Kalrez® or exploring alternative high-performance sealing options, M&P Sealing is here to help you make the right call based on data, experience, and real-world performance.