encapsulated o-rings, They combine the qualities of PFA-FEP with silicone-VMQ or viton-FKM elastomers. They consist of a 0.2 mm top layer that protects the elastomeric interior from aggressive chemical environments.
There are different combinations:
- Viton-FKM + FEP
- Viton-FKM + PFA
- Silicone-VMQ + FEP
- Silicone-VMQ + PFA
The potted o-rings They are commonly used in the pharmaceutical and food industry since they are manufactured under FDA standards, and in the chemical and petrochemical industries thanks to their ability to work against highly aggressive chemical agents.
Preferably an encapsulated O-ring should be used for static sealing services. However, it can be used in dynamic rotary applications as long as the peripheral speed is very low.
The materials used to cover the joint, as we have already mentioned, are EFF and the PFA. Their properties are similar, although PFA behaves better at temperatures above 200 ºC.
Main characteristics of the encapsulated:
- They offer a high chemical resistance.
- They have a wide temperature range.
- They support a strong resistance to high pressures.
- They have one low friction surface and one low solvent absorption.
- They enjoy a high resistance to “COMPRESSION-SET”.
- His sealing capacity It is higher than in other boards.
- It can be said that they are similar to a “teflon-coated” elastomer
Typically used as a static gasket, FEP and PFA provide excellent chemical resistance and the inside of Silicone a flexibility that plastic does not have. Silicone is usually used (-60 to +260ºC) to work with products that require the FDA standard or that are in contact with food. The use of a FEP jacket will limit stability to a temperature range lower than that of PFA, which will remain stable up to +260ºC, also having the property of superior resistance to abrasion and pressure.
FEP Encapsulation / VMQ Solid Silicone Core:
Normally red silicone, optionally in white.
Temperature range: from -50 ºC to +204 ºC.
PFA Encapsulation / VMQ Solid Silicone Core:
To the previous conditions we add that the resistance of the encapsulated joint to abrasion is improved with respect to the FEP coating and that the temperature range improves.
Normally used as a static seal, the FEP and PFA provide excellent chemical resistance and the fluoroelastomer body, a flexibility that plastic does not have. We will preferably use the FKM (-20 to +204 ºC), for aggressive uses, taking advantage of its chemical resistance. The use of an FEP jacket will limit stability to a temperature range lower than that of PFA, which will remain stable up to +260 ºC, also having the property of superior resistance to abrasion and pressure.
FEP Encapsulation / FKM Solid Silicone Core:
Temperature range: from -20 ºC to +204 ºC.
PFA encapsulation / Solid FKM core:
To the previous conditions we add that the resistance of the encapsulated joint to abrasion is improved with respect to the FEP coating. The temperature range improves using FFKM and can reach 250ºC
They are supplied in different standard diameters and there is the possibility of custom manufacturing.
We can supply non-nominal gaskets.