Choice of your elastomeric seal
It is best to base the choice of the elastomeric sealing material of your flow meter on the chemical resistance at operating conditions. Through the years, we have gathered a lot of information about the compatibility of various compounds, and we can advise you accordingly.
FKM or FPM (Viton®) – elastomeric seal
In many applications a general elastomeric seal, such as FKM or FPM flouroelastomer, is used (also known as Viton®).
In-depth information: FKM is short for fluoroelastomer according to the American standard ASTM. FPM is the international abbreviation according to DIN/ISO and Viton® is the registered trademark of DuPont Performance Elastomers.
This type of elastomeric seal causes limited chemical compatibility issues. However, the chemical resistance of the used elastomer is not always compatible with the chosen gas in your process. So, please check this on forehand.
As mentioned before, FKM and FPM are used in many different applications. Besides these, you can also choose to use:
- FFKM or FFPM (Kalrez®)