Parco is a leading supplier of contoured, rubber back-up rings for use with O-rings in high-pressure applications. Pressure applied evenly to both sides of a seal normally has no effect on sealing performance. When a pressure difference is anticipated, elastomer selection must also consider differential pressure resistance. High differential pressures will cause improperly specified O-rings to extrude, resulting in seal damage and eventually failure. The use of back-up rings allows for substantial improvement in extrusion resistance. Parco’s 90-durometer back-up rings offer the protection you need for high-pressure applications.
Below is a list of our popular compounds for back-up rings.
|Nitrile||2067-90||90||Black||Extrusion and abrasion resistant; high pressure resistant|
|Nitrile||4900-90||90||Black||Low cost; general purpose|
|Fluorocarbon||9009-90||90||Black||High-temperature resistant; AMS 7259 and AMS R 83248 and MIL R 83248 compliant; QPL-listed|
Learn more about O-ring Extrusion.