Kalrez ®

From aerospace and chemical processing to chip manufacturing and oil and gas applications, DuPont™ Kalrez® elastomers are engineered to provide more stability, more resistance, and more effective sealing. Period. While DuPont didn't invent o-rings or specialty sealants, it has a 40-year track record of innovation and development, creating sealants that stand up to the most challenging operating environments. Aside from its cleanliness and purity, Kalrez® polymer chains are engineered to be one of the most inert polymer structures available, standing up to more than 1,800 different chemicals while offering high-temperature stability. Kalrez® perfluoroelastomer (FFKM) parts are manufactured to the highest quality standards. Every part has documented traceability, and these parts provide one of the longest, most predictable lifespans in industry. 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.

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DuPont Kalrez® and Vespel® Center of Excellence

When sealing matters, choose DuPont Kalrez® and Vespel® products. DuPont™ Kalrez® and Vespel® work with customers to bring state of the art technology to solve customers’ toughest application challenges.

Kalrez® Sealing Technologies

From aerospace and chemical processing to chip manufacturing and oil and gas applications, DuPont™ Kalrez® elastomers are engineered to provide more stability, more resistance, and more effective sealing. Period.

DuPont Kalrez® and Vespel®

Perfluoroelastomer parts have been the sealing material of choice for long-term reliable sealing in the harshest chemical environments. Today, elastomeric seals are expected to perform in a variety of even more aggressive chemicals and at higher temperatures. 

Kalrez® 0090 parts for Rapid Gas Decompression

DuPont scientists developed Kalrez® 0090 perfluoroelastomer parts for outstanding resistance to repeated rapid gas decompression. 

Browse products in this brand

Complete your formula with these ingredients

Branded product

Kalrez® 4079

Polymer: Perfluoroelastomer

Branded product

Kalrez® AeroSeal™ 7777

Polymer: Perfluoroelastomer

Branded product

Kalrez® AeroSeal™ 7800

Polymer: Perfluoroelastomer

Branded products

Kalrez® 3018

Kalrez® AeroSeal® 7797

Kalrez® Spectrum™ 6375

Kalrez® 6190

Kalrez® Spectrum™ 7075

Kalrez® 1050LF

Kalrez® 0090

Kalrez® 3065

Kalrez® 9500

Kalrez® Spectrum™ 6380

Kalrez® 8085

Kalrez® 4079AMS

Knowdz for Kalrez

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Technical product information

Features and Benefits

Kalrez® elastomers for specialty sealing are engineered to resist more than 1,800 chemicals while offering high temperature stability. Advantages of Kalrez® include:

  • Resists over 1,800 different chemicals

  • High temperature stability up to 327°C

  • Maintains seal integrity

  • Reduces maintenance and operating costs

  • Long seal life

  • Meets safety standards for pharmaceutical and food processing

  • Available in standard and specialty compounds formulated for custom use

Kalrez® FFKM Applications
  • Seals and o-rings in pumps, reactors and flange joints

  • Valve stem packing systems

  • High-performance parts for aerospace, oil and gas equipment, transportation, and chemical processing

  • Life science applications

  • Semiconductor processing

  • Photovoltaic manufacturing seals

  • Food contact materials

Kalrez® FFKM Parts Chemical Resistance

Kalrez® perfluoroelastomer (FFKM) parts withstand attack from over 1,800 chemicals, solvents and plasmas. While exhibiting excellent chemical compatibility, the Kalrez® product line delivers outstanding performance in aggressive process environments. Whether it’s resistance to acids, amines, plasma, ultrapure de-ionized water or strong bases, by selecting the Kalrez® product that is best suited to a specific application, manufacturers can improve seal performance in their operating environment. Kalrez® parts are available in a number of different compounds that are formulated to optimize properties and give the best possible performance in various chemicals and temperatures.

Fluoroelastomer O-ring (left) and Kalrez® O-ring (right). The Kalrez® O-ring exhibits less volume swell in trisolvent test

Chemical Resistance Chart

Case Studies

Extending Lifetime of Critical Seals in HDPCVD Processes

As the semiconductor industry continues to invest in 300 mm wafer fabrication, the spotlight is on process improvement and the greater demands this technology makes on process equipment. In HDPCVD processes elastomer sealing materials can be a weak link because of the need for seal replacement during preventive maintenance (PM) procedures.

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Kalrez® Parts in Natural Gas Sampling Systems and Delivery

Transporting natural gas from well to consumer is a delivery challenge faced by industrialized nations throughout the world. In the United States alone, well over 270,000 miles of above- and below-ground pipelines are dedicated to delivering gas to the millions of households and commercial businesses that rely on natural gas for heat and energy.

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Kalrez® Spectrum™ 7275 Double Seal Life in Chlorine Dioxide Service

Chlorine dioxide is a strong oxidizing gas that finds many uses as bleaching agent and disinfectant, being a more effective and safer biocide than other sources of chlorine. Most of the production of chlorine dioxide is used at paper mills for pulp bleaching.

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