The main function of the back up ring is to prevent the O-ring from being squeezed onto the low-pressure side under the action of pressure when the O-ring gap is large, in which the O-ring may be damaged and consequently lose its function if there is excessive pressure.
The following are the detailed dimension table we provide. More various dimensions and information are avaliable on our catalog.
Applications:
Temperature: -30°C to 120°
CExposure to liquids: Refer to the chemical resistance table.
Pressure resistance: See chart in the followings (in the chart: horizontal coordinate: total diameter gap (mm)
Vertical coordinate: Operating pressure (bar); curve labeling (from top to bottom); Limits for NBR back-up rings; limits for PTFE
back-up rings. O-ring hardness will also affect its use.
