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Kalrez Case Studies

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Standing up to over 1,800 different chemicals

From aerospace, transportation and chemical processing to chip manufacturing and oil and gas applications, DuPont™ Kalrez® is engineered to provide more stability, more resistance and more effective sealing. These case studies highlight the superior performance Kalrez® parts.

Critical Seals in HDPCVD Processes
The Challenge – 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…

Kalrez® KVSP™ valve stem packing saves 56.000 £
BP Chemicals – Following trials of alternative valve stem packing materials, BP Chemicals Limited significantly reduced unscheduled reactor shutdowns and saved an estimated 56.000 £ annually for each reactor control valve…

Kalrez® O-rings for Hydrogen Sulfide Removal
The Challenge – Amine units operate under harsh chemical environments. H2S for example, needs to be handled with care and can cause embrittlement of metal equipment. These processes also operate at high…

Kalrez® Spectrum™ 6375 O-rings for PTFE replacement
The Challenge – The filling line at Dow AgroSciences plant in Drusenheim, France – a global leader in pest management and biotechnology products – processes aggressive solvents, surfactants…

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…

Metal O-rings Replacement
The Challenge – Gather Industrie GmbH, Mettmann, Germany, was facing metal seal deformation problems at high temperatures in gear pumps designed to operate in temperature up to 300 °C & pressure of 100 bar, which was causing leakage…

Natural Gas Sampling and Delivery
The Challenge – 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…

O-rings for Gas Sweetening Valves
Gas sweetening is a common unit process used in refineries, petrochemical plants, natural gas processing plants and other industries. The glycol-based solvent chemistry together with Rapid Gas Decompression…
O-rings in Pressurized Water Reactor
One of the many uses of boiler feed pumps is as part of a Pressurized Water Reactor (PWR) system in nuclear power plants. In a PWR, the primary coolant (superheated water) is pumped under high pressure…

Kalrez® Spectrum™ 6380 Offers Amine Resistance to Improve MTBR
The Challenge – A.W. Chesterton was challenged to improve the mean time between repairs (MTBR) in a mechanical seal for a hot, primary amine service at a major chemical facility…

Pharmaceutical Seals for CIP and SIP
The Challenge –  Pumps used in pharmaceutical, biotechnological and sterile processes are subject to some of the highest standards and safety requirements worldwide. In addition to ease…

Kalrez® Parts Extend Service Life for Process Instrument
The Challenge – By switching from gasket seals of PTFE to custom gaskets of DuPont™ Kalrez® perfluoroelastomer parts in the sensor head of a process instrument refractometer used by…
Sealing Collaboration Pays Dividends in Chamber Cleaning
The Challenge – In the very competitive environment of semiconductor chip manufacturing, reduced cost per wafer is a top priority. DuPont successfully collaborated with Spansion…

Kalrez® Spectrum™ 7075 for Clamping Systems
The Challenge – A leading German manufacturer of heavy duty clamping systems for…




Standard Kalrez® O-Ring Compounds

Daemar DMR O-Rings Kalrez

Kalrez® Compounds – 4079

4079 perfluoroelastomer parts are a black, low compression set product for use in many dry and wet semiconductor process environments. It has excellent chemical resistance, good mechanical properties and outstanding thermal stability.


Kalrez® Compounds – 6375

6375 is designed to give outstanding performance in the widest possible range of chemicals and temperatures. This product is an excellent choice for use in acids, bases, amines, steam, ethylene oxide, and many other aggressive chemicals.


Kalrez® Compounds – 7075

7075 is designed for general-purpose use as O-rings or custom sealing components in the chemical and hydrocarbon processing industries. It is a carbon black-filled compound with mechanical properties designed for improved sealing performance in temperature cycling applications. 7075 has improved thermal resistance that extends maximum service temperature to 327 °C (620 F).


Kalrez® Compounds – 0090

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. Some application areas include downhole equipment such as drilling and completion tools as well as industrial equipment including pumps and valves.

Specialty Kalrez® O-Ring Compounds


Kalrez® Spectrum™ – 7375

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® Spectrum™ 7375 parts exhibit excellent compression set resistance, outstanding physical property retention, and good mechanical strength properties.


Kalrez® Compounds -6380

6380 is a non-black product specifically developed for chemical processes involving hot, aggressive amines. It has also been successfully used in applications involving highly oxidizing chemicals. In addition, it has excellent overall chemical resistance. This cream colored product is easily identifiable when selecting an O-ring material for harsh chemical plant services.


Kalrez® Compounds -7090

7090 is a product for uses requiring higher hardness/higher modulus than more typical applications. Kalrez® 7090 perfluoroelastomer parts are well suited for both static and dynamic applications as well as specific sealing applications requiring extrusion resistance at high temperatures.


Kalrez® Compounds -0040

0040 -is a black product specifically designed for low temperature environments where significant chemical resistance is required. Kalrez® 0040 parts maintain elasticity and seal force at temperatures unattainable by other perfluoroelastomers.




Kalrez® Compound – W240

Kalrez® W240 perfluoroelastomer parts are a black product for photovoltaic wet manufacturing processes requiring a wide range of chemical resistance. W240 provides an excellent combination of properties (resistance to acids/bases) and is the product of choice for wet processes as an upgrade from standard elastomers, i.e., FKM, NBR, EPDM, etc.




Kalrez® is a registered trademark of E.I. du Pont de Nemours and Company or its affiliates












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