If the pressure then increases repeatedly, permanent damage or even complete destruction of the O-rings can occur.
Back-up rings are used to prevent gap extrusion. Although back-up rings do not perform a sealing function, they support the permanent and damage-free sealing function of the O-rings by closing the sealing gap on the side facing away from the pressure.
Furthermore, parameters such as operating temperature, gap height and resistance to the ambient medium play a decisive role in the material selection of the back-up rings.
Plastics and elastomers such as PTFE, polyurethane or NBR, FPM and EPDM come into question for the bck-up rings.
If back-up rings from existing dimension series, such as NBR 90, are used, the design of the installation space must be in accordance with the manufacturer's specifications.
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