Tag Archives: Kalrez Perfluoroelastomer Parts

Kalrez® O-rings for Hydrogen Sulfide Removal

Kalrez Perfluoroelastomer Seals: Authorized DistributorAmine treatment is a process typically used for Hydrogen Sulfide removal from natural gas (sour gas). This operation is commonly referred to as gas “sweetening,” acid gas removal, or amine scrubbing

Amine units are used all over the world in oil refineries and gas plants to remove hydrogen sulfide (H2S) from a product stream. New environmental standards are more strict and require ever-decreasing contents of H2S in clean natural gas. Most of the new sources of oil and gas discovered today have high contents of H2S which demand more efficient removal technologies (the Shah Gas field in the United Arab Emirates for example has up to 30%  H2S).

The Challenge of Amine Units in Harsh Chemical Environments

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 temperature where perfluoroelastomer sealing components are required. Amines, however, are known to be aggressive to many FFKMs. When elastomers are in contact with amines, they tend to swell to a high degree, which results in a loss of mechanical properties and extrusion. This can lead to leakage, rupture of the fluid film in mechanical seals due to face seal deformation, and an increase in torque needed to operate.

Solution: Kalrez 6380 for Lower Swell Properties

kalrez spectrum o-rings

DuPont™ Kalrez® Spectrum™ 6380 perfluoroelastomer parts offer outstanding resistance to amines because it exhibits four times lower swell over general purpose perfluoroelastomer (FFKM) offerings.

The use of DuPont™ Kalrez  Spectrum™ 6380 parts in these applications may extend the MTBR (Mean Time Between Repairs) of valves and pump mechanical seals and reduce leakage which can help contribute to reduce maintenance costs and lower emissions. The latest Kalrez 0090 parts represent another option for this application when high pressure resistance is needed. The following graph compares the chemical resistance of Kalrez Spectrum™ 6380 to other sealing materials when exposed to a typical amine/water mixture used in gas sweetening units.

picture of volume swell FFKM


Gallagher Fluid Seals is an authorized distributor and partner of Dupont Kalrez®. For more information or if you have a project / application where you need assistance, contact us today.

The original article was written by staff at Dupont and can be found here.

Kalrez PV8070 Parts in Reactors

High Performance Seals for Polycrystalline Silicon Process Equipment

The Challenge

To meet growing demand in solar cells, the Siemens* process is used to produce highly purified polycrystalline silicon by thermally decomposing tri-chloro-silane (TCS). The reactors employed require three kinds of high-performance seals in the following locations: A) bell jar seals; B) electrode seals between the electrode and ceramic inlet; and C) a gasket for the view port seal (see schematic).

pv8070 seals in Polycrystalline Silicon Process Equipment

Application Details

The process involves a very hot, dry environment with temperatures up to 1200°C (2100°F). Sealing components see up to 300°C (572°F). Process media include TCS and aggressive by-products of its decomposition, such as HCl gas. Superior compression set performance is needed for effective sealing and extended seal life. Very low outgassing is a key requirement for preventing contamination of the process environment.

The presence of harsh chemicals in high temperature conditions often require an upgrade from standard sealing materials to PTFE or fluoroelastomers (FKM) to improve thermal stability and chemical resistance. However, PTFE can deform and creep “hot flow” in the bell jar seal increasing the risk of product loss. FKM, with its high temperature rating of 200°C (392°F), also has deficiencies in this 300°C (572°F) environment.

The Solution and Key Advantages of Kalrez PV8070

Kalrez PV8070 perfluoroelastomer parts installed as washers and gaskets in reactors for the Siemens CVD process have demonstrated outstanding performance in this demanding application. Kalrez® PV8070 parts are effective seals that provide: Continue reading Kalrez PV8070 Parts in Reactors

Kalrez® 1050LF General Purpose FFKM

kalrez 1050LFDuPont™ Kalrez® 1050LF perfluoroelastomer parts are a carbon black-filled general-purpose product for o-rings, seals, and other parts used in chemical process industries. It is a classic-grade and longtime favorite for premium performance and provides a more economical option than similar compounds such as 7375.

Kalrez 1050LF o-rings can maintain their recovery with elasticity following high-pressure applications, maintaining a tighter seal for longer periods of time compared to other compounds. With a pressure rating of 1,500 PSI, it can help extend seal life and integrity, ultimately lowering costs.

With above-average hot water and steam resistance, the maximum application temperature for 1050LF is approximately 550°F (up to 288°C). This compound is also known for its excellent amine resistance and compression set properties. It has a Shore A durometer of 82.

In addition, Kalrez 1050LF has excellent chemical resistance, with the ability to withstand contact of over 1,800 different chemicals, plasmas, and solvents.

In particular, this compound stands out for wet applications in semiconductor manufacturing – stripping and copper plating, which include:

  • Door/lid seals
  • Drain seals
  • Seals for chemical containers
  • Fittings
  • Seals for filters/connectors
  • Flow meters

This reliable compound from DuPont is classified as a general usage product. It is not recommended for use in organic or inorganic acids as high temperatures and is not recommended for applications that require rapid temperature cycling properties.


For more information about Kalrez 1050LF, or to see if it is a good fit for your application, contact Gallagher Fluid Seals today.

Gallagher Fluid Seals is an authorized distributor for DuPont™ Kalrez®.

Kalrez Perfluoroelastomer Parts for Pharmaceutical and Food Handling Applications

Kalrez® parts made from compounds 6221 and 6230 provide superior chemical resistance and low contamination from extractables in pharmaceutical and food handling applications where FDA compliance is required. Compounds 6221 and 6230 are especially suited for Water For Injection (WFI) systems, Steam-in-Place (SIP) cleaning and other critical systems,

Unlike other elastomeric seals made with FDA compliant elastomers, Kalrez perfluoroelastomer parts are thermally stable up to 260°C (500°F), permitting use in applications such as Stage II Sterilization processes, where other elastomers lose their sealing capabilities.

Continue reading Kalrez Perfluoroelastomer Parts for Pharmaceutical and Food Handling Applications