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Keep in mind that just as the outer jacket of FEP in the FEP encapsulated o-ring brings certain advantages to the o-ring, the inner elastomer core also brings its own desirable characteristics. That doubles the advantages you can get from this one o-ring.
Here at PSP we find that most of our customers prefer a Viton? core. Because of the low compression set of Viton?, it is a good fit for most applications. If the application requires extremely high or low temperatures then another elastomer needs to be chosen.corteco oil seals high quality.
An encapsulated o-ring with silicone as the core works very well for a very low temperature applications. If low loading is also a requirement, then a hollow core can be used, it compresses easier than a solid silicone core.
In spite of the fact that encapsulated o-rings offer so many advantages, there are times when you would not want to use them.ring seal.
Abrasion
FEP does not wear well in abrasive materials whether they are liquid, powder or a slurry. The wall of the jacket is thin and simply will not stand up to any kind of abrasive materials.
Dynamic Situations
FEP does not stand up well in a dynamic environment even in situations with low speed and excellent finishes on the surface of the mating parts.corteco oil seals high quality.
Collapsing
If you try to squeeze the encapsulated o-ring into a bore it can be severely damaged because the jacket will kink.
Stretching
Just as FEP cannot be compressed, it also will not survive extreme stretching. It will crack and the elastomer core of Viton? or silicone may also break.valve seal.
Please call us if you need help in choosing a FEP encapsulated o-ring for your application. Our engineers are happy to talk about all the details of your application so you can make a wise choice.corteco oil seals high quality.