Chemical Processing Seals For Reliable Performance
Kalrez® seals provide exceptional service in high-heat, aggressive-chemical processing environments.
DuPont™ Kalrez® chemical processing seals are a high-performance, cost-effective choice for demanding manufacturing uses. They provide broad chemical resistance and stability up to 327°C, with a range of grades to match specific applications.
A New Standard of Resistance
Kalrez® 4079 set the standard for high-temperature, chemically resistant seals with its introduction in the 1980s. It rapidly found its way into aerospace, chemical processing and oil and gas applications. Since its introduction, many additional products have been added to the Kalrez® portfolio, to help meet unique application requirements.
Kalrez® Spectrum™ 6375 seals have been an excellent choice for use with acids, bases, amines, steam, ethylene oxide, and many other aggressive chemicals. Mixed streams, once a problem for many chemical processors, are now applying Kalrez® Spectrum™ 6375 parts.
For higher temperature environments, Kalrez® Spectrum™ 7075 seals can withstand temperatures up to 327°C. Kalrez® Spectrum™ 7275, the latest innovative FFKM from DuPont, provides long life sealing in an array of aggressive chemical environments that are known to be difficult for sealing, including ethylene oxide, acrylic monomers, silanes & chlorosilanes and strong oxidizers such as nitric acid, chlorine and chlorine dioxide, at temperatures up to 300°C.
Kalrez® parts are available in various compounds to meet individual application requirements. Contact DuPont if you require assistance in selecting the appropriate product.
More Efficient Production
Kalrez® chemical processing seals can reduce downtime and extend the mean time between replacements. Some examples of their uses include couplings, pumps, valves, reactors and flange joints. Kalrez® seals have proven performance in mechanical seal applications around the world. Whether you choose O-rings or a customized shape, Kalrez® is a high-value, cost-saving part that you can put to work in your applications.
DuPont application engineers collaborate with end-users to help users specify products that help meet their application requirements, whether it’s aggressive amines, solvents, high temperatures, or seals designed for specialty applications. Kalrez® seals are used in a range of industries, including:
- Chemical production and transport
- Petroleum refining
- Agricultural chemicals manufacturing
- Painting and coating operations
- Analytical and process control instrumentation
Safety and Compliance Support
Kalrez® seals can help reduce leaks and fugitive emissions, for improved compliance with environmental regulations. Because Kalrez® seals used in chemical processing maintain their sealing integrity within a broad range, they can help maintain operations and lower overall production costs.
Kalrez® perfluoroelastomer parts
Kalrez® perfluoroelastomer parts (FFKM) resist over 1,800 different chemicals and withstand temperatures up to 327ºC. This elastomer is widely used in demanding chemical processing and semiconductor manufacturing, as well as pharmaceutical, aerospace and oil & gas applications.
Information & Ideas
- Kalrez® Parts Heat Resistance
Chemical Resistant Elastomers
DuPont has a portfolio of chemical resistant elastomers and thermoplastics to match a broad spectrum of challenges – from aggressive automotive fuels to custom industrial equipment.
- Kalrez® Parts Reduce Wafer Contamination
- Kalrez® Composite Seals
Seal Outgassing Test Results
Evaluation and comparison of outgassing for three different classes of elastomeric seal materials used in semiconductor process environments using DuPont test methodology.
Kalrez® TriLobe™ Seals
Kalrez® TriLobe™ Seals improve seal life in dovetail grooves. This design combines the excellent chemical, thermal and plasma resistance of Kalrez® perfluoroelastomer parts with a unique cross-sectional shape.
- Kalrez® 9100 for lower contamination
- Kalrez® Bonded Door Seals
- High Performance Polymers
Kalrez® O-rings for Hydrogen Sulfide Removal
Amine units for hydrogen sulfide removal (H2S) at high temperatures use elastomers like Kalrez® Spectrum™ 6380 FFKM parts for resistance to amines. 6380 helps extend MTBR of valves and pumps in amine service.
O-rings in Pressurized Water Reactor
Due to the combination of extreme temperature, pressure and chemical environments, Kalrez® 0090 was used in a series of mechanical seals employed in the operation of boiler feed pumps for pressurized water reactors.
Process Instrument Gaskets
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 the food, pulp and paper and chemical industries, process instrument manufacturer.
- Sealing Solutions for Clamping Systems
Parts for Amine Resistance
A major chemical company switched to Kalrez® Spectrum™ 6380 perfluoroelastomer parts to improve amine resistance & extend mean time between repairs. Improvement of up to 3x in MTBR achieved in a mechanical seal for hot, aggressive amines.
- Kalrez® Spectrum™ 6375 O-rings for PTFE replacement
- Metal O-rings Replacement
Kalrez® KVSP™ valve stem packing saves 56.000 £
Kalrez® KVSP™ valve stem packing, a solution to help reduce fugitive emissions, valve leakage and provide improved control — saves BP Chemical over 56.000 £ per valve annually, cuts shutdowns.