The main function of a Backup-Ring is to prevent gap migration under pressure with large gaps. The Backup-Ring prevents this consistently and thus a rapid O-Ring destruction.


Installation is simple and fast. The Backup-Ring is fitted at low pressure side. In case of a double-acting seal two Backup-Rings can be installed on both sides.

Advantages of this assembly

The life of the seal is extended. The costs of the sealing system are low: it allows more tolerance of parts to be sealed, thereby reducing the processing cost.

Operation conditions Temperatures of:
–20 °C to +200 °C with FPM
–30 °C to +120 °C with NBR

PTFE Backup-Ring

The function of a PTFE Backup-Ring is similar to that of a Backup-Ring of NBR, but it has a wider range of applications:
Temperatures of –150 °C to +250 °C