Perfluoroelastomers
- August 03, 2022
DuPont™ Kalrez® 7375, is an innovative FFKM oil-seal product exhibiting broad chemical and water/steam resistance properties required at high temperatures in chemical process industry applications. Kalrez 7375 parts present excellent compression set resistance, exceptional physical property retention,
- March 23, 2022
Natural Rubber Short Supply
Plagued by global supply chain issues stemming from coronavirus and environmental issues, the natural rubber shortage continues to be exasperated by the war in Ukraine and Russia.
In 2021, shortages were reported mainly due to flooding and leaf disease. A poor crop led to a decrease in the cultivation of these highly desirable trees. The supply for raw gum already was expected to remain tight for several years due to the 7-year maturity period
- February 24, 2022
components their machines need in order to operate and produce their desired end product. The ways that tooling impacts a manufacturing operation are imperative. Not only is the tooling of your own manufacturing important, but also of the tools themselves that will be a part of your own operation. It’s necessary to have components that have been tooled to specifications, have high quality, and will perform under stress.
Potential Effects of Tooling
The end result of your
- February 09, 2022
Gallagher Fluid Seals’ customer is a global manufacturer of communications products, instruments, and sophisticated electronic components.
GFS collaborated with our FFKM supplier-partner to develop a low-temp 60 durometer compound that satisfied the needs of the customer’s rigorous temperature, environmental, and flexibility requirements.
- January 14, 2022
Custom Seals from Gallagher Fluid Seals
While you could buy seals made with the size and materials of industry standards, sometimes the performance may not be up-to-snuff. Whether you have a static or a dynamic application, each one has its own unique traits and characteristics. Rather than finding a product that "fills the needs" of your specific application, wouldn't it be more prudent to create the perfect solution?
Using custom-engineered seals from GFS, specific to your application,
- January 15, 2021
Recognized as the leading supplier of perfluoroelastomer parts for over 40 years, DuPont offers a variety of high performing products that are formulated to give the best possible seal performance in numerous aggressive environments. Excellent balance of finished properties is achieved through careful use of proprietary polymers, cure systems, fillers and additives, resulting in superior seals for a broad range of applications.
- November 03, 2020
For over 40 years, DuPont™ has been relentless in pursuing improvement in the manufacture of perfluoroelastomer (FFKM) parts. Elastomeric parts typically consist of three components: a polymer chain (the backbone of the elastomer), a crosslinking system (which links the polymer chains together and is the key to elasticity and sealing performance), and a filler system (used to enhance mechanical properties). Based on extensive experience, DuPont™ adjusts these components to optimize seal performance.
- September 17, 2020
Amine 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
- May 08, 2020
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).
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:
- February 21, 2020
As of October 31st, 2022, Kalrez 1050LF parts are no longer being manufactured.
For most applications, DuPont™ Kalrez® Spectrum™ 7375 may be a suitable replacement for 1050LF.
