Secondary SealThe following materials are used for the secondary seal between the PTFE lip and the housing:
Standard: FPM (–20 °C to +200 °C)
Special versions:
- NBR (–30 °C to +110 °C)
- EPDM (–60 °C to +150 °C)
- PTFE/metal-special composite
(–20 °C to +250 °C)