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Kalrez®

Stable in Harsh Environments

Specialty sealing engineered for your mission-critical applications.

O-rings made with high-performance 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 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.  

 
 
 
Uses
  • 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
Advantages
  • 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
 
 
 
 
 
 
 
 
 

Explore
 

Kalrez® products provide the best possible seal performance in aggressive environments.

 
 
 

Sealing Solutions

Three technicians in front of semiconductor manufacturing equipment that uses Kalrez® seals.

Sealing Solutions

01

Longer Life for Critical Seals in Semiconductor Processes

Read the Case Study

Man checking natural gas delivery equipment that relies on Kalrez® seals.

Sealing Solutions

02

Liquid and Gas-tight Seals for Natural Gas Systems

Read the Case Study

A paper mill that found that Kalrez® seals last twice as long in chlorine dioxide service.

Sealing Solutions

03

Doubling Seal Life in Paper Mill’s Chlorine Dioxide Service

Read the Case Study

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Videos

What Makes Kalrez® Different?

Kalrez® Rapid Gas Decompression Testing

Innovation Using Kalrez® and Vespel®
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Products

Product Name Description
Kalrez® 0090 Kalrez® 0090 perfluoroelastomer parts deliver durable, reliable sealing solutions for applications requiring excellent rapid gas decompression (RGD) properties as well as high hardness and high modulus properties.
Kalrez® 1050LF DuPont™ Kalrez® 1050LF perfluoroelastomer parts are a general-purpose product for O-rings, seals, and other parts used in chemical process industries. It has good hot water/steam resistance, excellent amine resistance, and good compression set properties. The maximum suggested service temperature is 288°C (550°F). It is not recommended for use in organic or inorganic acids at high temperatures.
Kalrez® 3018 DuPont™ Kalrez® 3018 perfluoroelastomer parts are a carbon black filled product similar to Kalrez® 1050LF, except with higher hardness/modulus.
Kalrez® 3035 DuPont™ Kalrez® 3035 perfluoroelastomer parts are a carbon black filled product well suited for use in production of valve stem packings.
Kalrez® 3065 The mechanical properties and chemical resistance of Kalrez® 3065 make it the best choice for many oil and gas well environments.
Kalrez® 4079 DuPont™ Kalrez® 4079 perfluoroelastomer parts are a low compression set product for general purpose use in O-rings, diaphragms, seals and other parts used in the chemical process and aircraft industries. It is a carbon black filled product with excellent chemical resistance, good mechanical properties, and outstanding hot air aging properties. It exhibits low swell in organic acids, inorganic acids and aldehydes, and has good response to temperature cycling effects. A maximum service temperature of 316°C (600°F) is suggested, with short excursions to higher temperatures possible. Kalrez® 4079 is not recommended for use in hot water/steam applications or in contact with certain hot aliphatic amines, ethylene oxide, or propylene oxide.
Kalrez® 4079AMS DuPont™ Kalrez® 4079AMS perfluoroelastomer parts are a specialty black product that meets the requirements of Aerospace Material Specification (AMS) 7257. It offers outstanding thermal stability, excellent compression set resistance and good seal force retention properties. It also offers excellent resistance to HTS (High Thermo-Oxidative Stability) gas turbine engine lubricating oils and has good response to temperature cycling effects. Kalrez®4079AMS has good mechanical properties and is well suited for both static and dynamic sealing applications. A maximum continuous service temperature of 316 °C (600 °F) is suggested. Short excursions to higher temperatures may also be possible.
Kalrez® 6190 DuPont™ Kalrez® 6190 perfluoroelastomer parts are a carbon black-filled product specifically designed for custom part and high volume applications. It has excellent thermal stability good mechanical strength properties and can be used in both static and dynamic sealing applications up to 300 °C (572 °F). In addition, Kalrez® 6190 is resistant to most chemical solvents but is not suggested for use in steam, strong acids or strong bases. Please contact a Kalrez® Application Engineer to discuss performance fit in your specific application.
Kalrez® 6221 DuPont™ Kalrez® 6221 perfluoroelastomer parts are a white product that provide superior chemical resistance and low contamination from extractables in pharmaceutical and food handling applications where FDA compliance is required. DuPont™ Kalrez® 6221 parts are especially suited for Water for Injection (WFI) systems, Steam-in-Place (SIP) cleaning and other critical systems. Kalrez° 6221 parts are thermally stable up to 260°C (500°F), permitting them to be used in Stage II Sterilization processes, where other elastomers lose their sealing ability. Kalrez® 6221 is available as O-rings. For white custom parts, please refer to Kalrez® LS205 parts.
Kalrez® 6230 DuPont™ Kalrez® 6230/6230A* perfluoroelastomer parts are a black product that provide superior chemical resistance and low contamination from extractables in pharmaceutical and food handling applications where FDA compliance is required. DuPont™ Kalrez® 6230/6230A parts are especially suited for Water for Injection (WFI) systems, Steam-in-Place (SIP) cleaning and other critical systems. Kalrez° 6230/6230A parts are thermally stable up to 260°C (500°F), permitting them to be used in Stage II Sterilization processes, where other elastomers lose their sealing ability.
Kalrez® 6375UP To transform raw semiconducting materials into a useful device requires hundreds of chemical processing steps. A significant number of these steps involve aggressive acids, solvents, and bases (including amines) used to clean, rinse, etch or strip unwanted materials and contaminants from the wafer surface. These chemicals can attack elastomeric seals causing them to swell and degrade or to leach undesirable metallic and ionic extractables that affect integrated circuit functionality.
Kalrez® 7075UP DuPont™ Kalrez® 7075UP perfluoroelastomer parts are a black product targeted specifically metal CVD applications. It offers outstanding thermal stability, very low outgassing and excellent compression set properties. Kalrez® 7075UP exhibits excellent seal force retention, has good mechanical properties and is well suited for both static and dynamic sealing applications. A maximum application temperature of 327°C (620°F) is suggested. Short excursions to higher temperatures may also be possible. Ultrapure postcleaning and packaging is standard for all parts made from Kalrez® 7075UP.
Kalrez® 8002 DuPont™ Kalrez® 8002 perfluoroelastomer parts are a clear product for ash/strip applications. This unfilled product offers excellent plasma-cracking resistance and ultra-low particle generation in oxygen and fluorine-based plasmas versus mineral-filled products. Kalrez® 8002 exhibits excellent resistance to dry process chemistry, has good mechanical strength and is well suited for static, low stress/low sealing force and “select” bonded door seal applications. A maximum application temperature of 275°C (527°F) is suggested. Ultrapure post cleaning and packaging is standard for all Kalrez® 8002 parts.
Kalrez® 8085 Kalrez® 8085 has been reported to significantly improve wafer production in a variety of semiconductor plasma process applications where oxygen and fluorinated plasmas are used during the cleaning cycle.
Kalrez® 8475 Kalrez® 8475 perfluoroelastomer parts are a white product that have been specifically developed to meet the challenging requirements associated with lamp anneal and RTP sealing applications in semiconductor thermal processes.
Kalrez® 8575 Kalrez® 8575 perfluoroelastomer parts are a white product for “select” etch, ash/strip and deposition process applications.
Kalrez® 8705 DuPont™ Kalrez® 8705 perfluoroelastomer parts are primarily designed for seal locations in the direct path of high energy ultraviolet (UV) radiation emitted from a conventional light source or from plasma.
Kalrez® 8900 Kalrez® 8900 perfluoroelastomer parts are a black product for all thermal processes, e.g., oxidation, diffusion furnace, metal CVD, ALD and LPCVD. It offers outstanding thermal stability, very low outgassing and excellent (low) compression set properties.
Kalrez® 9100 Kalrez® 9100 is an amber translucent product targeted specifically for PECVD and HDPCVD processes. It has also exhibited excellent performance in "select" etch processes.
Kalrez® 9300 DuPont™ Kalrez® 9300 perfluoroelastomer parts are a brown product for Dielectric (Oxide) Etch applications. It has been specifically designed for use in applications where the plasma environment is a combination of ions (“physical”) and radicals (“chemical”), i.e., where a balance of “physical” and “chemical” plasma erosion resistance is typically required.
Kalrez® 9500 Kalrez® 9500 exhibits excellent resistance to CVD and ash/strip process chemistry, i.e., ozone, ammonia and water vapor. It also offers outstanding thermal stability, very low outgassing and excellent mechanical strength.
Kalrez® 9600 DuPont™ Kalrez® 9600 perfluoroelastomer parts are designed for high purity, high temperature vacuum applications where seals are exposed to damaging Fluorine and Oxygen plasma radicals.
Kalrez® AS-568 The dimensions and tolerances of Kalrez® O-rings are listed and conform to AS-568. DuPont and its local authorized distributors of Kalrez® parts maintain inventories of many standard AS-568 O-rings. Actual lead times will be established at the time of the order placement. We work closely with customers to understand and meet their needs.
Kalrez® AeroSeal™ 7777 Kalrez® AeroSeal™ 7777 perfluoroelastomer parts are a specialty black product that meets the requirements of Aerospace Material Specification (AMS) 7257C.
Kalrez® AeroSeal™ 7797 Kalrez® AeroSeal™ 7797 perfluoroelastomer parts are a specialty black product specifically targeted for use in applications requiring high hardness/higher modulus properties.
Kalrez® AeroSeal™ 7800 Kalrez® AeroSeal™ 7800 perfluoroelastomer parts are a specialty black product that meets the requirements of Aerospace Material Specification (AMS) 7257.
Kalrez® Bonded Door Seals Bonded door seals for gate valves and slit valve door seal applications provide improved sealing performance versus conventional O-rings by reducing particle generation, extending seal life and minimizing replacement time during preventive maintenance.
Kalrez® CP222 DuPont™ Kalrez® CP222 perfluoroelastomer parts are the latest product for unique custom shapes or high volume applications.
Kalrez® KVSP™ Kalrez® Valve Stem Packing (KVSP™) systems can help to significantly reduce fugitive emissions and improve process control through the innovative use of Kalrez® perfluoroelastomer parts combined with other proven packing materials.
Kalrez® LS205 Kalrez® LS205 perfluoroelastomer parts provide superior chemical resistance and low extractables in demanding applications for use in food handling and pharmaceutical applications where FDA compliance is required.
Kalrez® LS390 DuPont™ Kalrez® LS390 perfluoroelastomer parts are a grey product for use as sanitary seals in food handling, beverage, and pharmaceutical applications where FDA, USP <87> and <88> Class VI compliance are required.
Kalrez® MS220 DuPont™ Kalrez® MS220 perfluoroelastomer parts are designed for mechanical seals where superior chemical resistance and low compression set are critical for successful sealing performance.
Kalrez® Metric O-rings The dimensions and tolerances of Kalrez® O-rings in metric sizes are listed. DuPont and its local authorized Kalrez® distributors maintain certain inventories of common metric sizes, but a full range of metric sizes is not normally inventoried
Kalrez® PV8070 Kalrez® PV8070 perfluoroelastomer parts are a black product for PV cell manufacturing processes requiring high temperature resistance including doping for n-type layer formation (bulk c-Si)..
Kalrez® Seals Couplings based on DIN11864-2, Form A, assume complete filling of the groove after compression of the O-ring in order to form a hygienic seal
Kalrez® Spectrum™ 0040 Kalrez® Spectrum™ 0040 perfluoroelastomer parts are specifically designed for low-temperature environments where significant chemical resistance is required (-42°C).
Kalrez® Spectrum™ 4001 DuPont™ Kalrez® 4001 perfluoroelastomer parts are a non-filled product which is well suited for selected high purity applications
Kalrez® Spectrum™ 6375 Kalrez® Spectrum™ 6375 is designed to give outstanding performance in the widest possible range of chemicals and temperatures.
Kalrez® Spectrum™ 6380 Kalrez® Spectrum™ 6380 perfluoroelastomers parts are a non-black product specifically developed for chemical processes involving hot, aggressive amines.
Kalrez® Spectrum™ 7075 DuPont™ Kalrez® perfluoroelastomer parts are the material of choice for mechanical seals, valves, flanges and other demanding chemical and hydrocarbon processing applications.
Kalrez® Spectrum™ 7090 Kalrez® Spectrum™ 7090 perfluoroelastomer parts are specifically targeted for use in applications requiring high hardness/higher modulus properties.
Kalrez® Spectrum™ 7275 Kalrez® Spectrum™ 7275 is designed to give outstanding performance in aggressive chemical environments.
Kalrez® Spectrum™ 7375 DuPont™ Kalrez® Spectrum™ 7375 perfluoroelastomer parts are an innovative FFKM product based on a patented crosslinking system for chemical process industry applications where broad chemical and water/steam resistance are needed at elevated temperatures.
Kalrez® TriLobe™ Seals DuPont has developed a seal design to improve seal life in dovetail grooves.
Kalrez® V-Rings The outstanding service record for DuPont™ Kalrez® parts in oil production applications is best shown by the results of testing V-rings recovered after six years’ service in a producing well.
Kalrez® W240 Kalrez® W240 perfluoroelastomer parts are the choice in PV wet and select dry processes as an upgrade from standard elastomers.