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Find A Better Fit With Custom Perfluoroelastomer Parts

Kalrez® custom perfluoroelastomer seals and parts can be made with unusual geometries to match unique sealing applications.

Kalrez® custom perfluoroelastomer parts combine high heat and chemical resistance. With unique, one-of-a-kind fit for superior sealing possibilities, Kalrez® can offer a variety of custom family shapes and standard geometries, including large and small parts. Kalrez® custom seals are available in a variety of compounds depending on the thermal, chemical and plasma resistance required.

Kalrez® custom and composite parts can be designed and molded to highly specific requirements to fit specialized equipment. Kalrez® slabs and sheets are also available in several compounds and sizes, supporting a wide range of flexible applications. Kalrez® parts offer high quality machined and molded prototypes.

Benefits of Kalrez® Custom Seals

  • Meets the rigors of AS9100 aerospace standard quality certification; DuPont is a certified designer and manufacturer of seals and sealing devices per AS9100. (Manufacturing facility in Newark, DE)
  • Proprietary technology for bonding compounds to a variety of materials, including aluminum, plastic, stainless steel, metal alloys, PEEK, brass, etc. Improves performance, and reduces cost by integrating the seal and substrate into one part.
  • Overall, Kalrez® custom seals improve meantime repair, longer life and lower operating costs.

Available For a Range of Uses
Custom perfluoroelastomer parts available include:

  • Valve seats
  • Diaphragms
  • Gaskets
  • Packer seals
  • T-seals
  • Column fittings
  • KVSP (Kalrez® Valve Stem Packing Systems)

Types of Shapes
Examples of composite Kalrez® parts include:

  • Special profiles and rectangular-shaped seals for slit valves
  • Rubber to metal bonding parts, such as bonded door seals and bonded poppets
  • Profiled quartz tube seals
  • Diaphragms
  • Lip seals
  • Tubing
  • Other specialized configurations

Expert Support, Including Finite Element Analysis
Advanced Finite Element Analysis (FEA) capabilities are available to help design new seal shapes, optimize compound selection and groove geometry, and model performance of parts in service. Use of FEA can shorten development times and produce innovative solutions for long-term sealing performance.

DuPont Centers of Excellence (COE) give customers the advantage and collaboration through application and testing expertise within our global network.



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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