Hytrel (a DuPont product) is a thermoplastic polyester elastomer, sometimes referred to as TPE, that combines in one product the elasticity of rubber with the strength and performance characteristics of an engineering thermoplastic. It can be found in applications such as:
Advanced EMC Technologies Blog
Spring-energized seals can solve quite a few problems for MRO (maintenance, repair, and operations) in the food processing industry. Many of the seals used in food processing are mission critical, and a failed seal can cost much more than just repairs and downtime because it can result in contamination.
Posted in: Spring-Energized Seals
Cryogenic seals are required in a variety of industries, including LNG fueling systems, specialty gas manufacturing, cryo coolers, radio astronomy, scientific instrumentation, pharmaceutical research, and many more. One of the most reliable sealing solutions for cryogenic applications are polymer spring-energized seals. In this blog post, we are going to review spring-energized seals and then discuss what the recommended spring configuration is for cryogenic applications.
Cryogenic sealing applications are challenging, to say the least. One popular solution is the use of spring-energized seals, and in this blog post we are going to talk about the 3 post popular materials used for spring-energized seals for cryogenic applications: PTFE, modified PTFE, and UHMW PE.
The performance of a dynamic PTFE seal depends greatly on the pressure and shaft velocity involved. In reality, a seal is in contact with only a small area of rotating shaft, which means that the dynamic forces and energy are going to be concentrated there. Much of the energy that comes from the shaft is going to be dissipated in two forms: wear and frictional heat, both of which can reduce the useful life of a seal. An increase in the force that holds the seal lip against the shaft or an increase in the speed of the shaft makes the effects of wear and heat even worse.
FLUID MEDIA AND PTFE SEALS:
You may not be aware of the fact that the fluid media has a significant effect on seal wear. In this article, we are going to explore exactly how fluid media can affect the performance of your PTFE spring-energized seal.
Need additional education? Check out these "Popular PTFE Post" from Advanced EMC Technologies:
PTFE Spring-Energized Seal Design
When designing a component that includes a spring-energized PTFE seal, it’s not enough just to specify all the seal parameters; another key part of the design is the surface finish of the mating surface. In this article, we are going to review what surface finish is, discuss the effects of surface finish on seal life, and then go over recommended surface finishes for spring-energized PTFE seals.
For more articles on PTFE Spring-Energized Seals from the Advanced EMC Technologies Blog:
Spring-Energized Seals Jacketing Material
When selecting a jacketing material for a spring-energized seal, engineers look at the
- operating temperature,
- pressure (including whether or not it is static or cyclic),
- dynamic conditions,
- media involved,
- amount of seal squeeze,
- and the geometry involved.
Get even more information on Spring-Energized Seals from the following posts from Advanced EMC Technologies:
Posted in: Polytetrafluoroethylene PTFE, Polyetheretherketone PEEK, Dynamic Sealing, Polymer Seals, Seals for Oil & Gas, Aerospace Seals, Sealing Solutions, Cryogenic Seals, UHMW Solutions, PTFE Seals, advanced polymers, Spring-Energized Seals, Teflon Seals
PTFE spring-energized seals are a popular choice for engineers. The reasons are many, including their long service life, even wear, and their ability to perform in some of the harshest environments. They work well in extreme temperatures; can even perform well in situations where operating conditions can vary significantly. They usually offer a low compression set, have a long shelf life, and work very well in non-lubricated applications. The use of PTFE results in extremely low friction and excellent chemical compatibility and users can choose from a variety of spring energizers.
As one of the key components of a spring-energized PTFE seals, each of these energizers offers a different set of characteristics that allow engineers to find just the type of seal to suit their application’s needs. In this article, we ae going to look at five different categories of energizers, and in what conditions they provide the best service: coil springs, V springs, helical flat springs, cantilevered finger springs, and elastomeric O-rings.
Need more energizing? Check out these informative PTFE Spring Energized Seals articles from the Advanced EMC Technologies blog: