Nitrile (NBR) O-Rings
Nitrile (NBR) Buna O-Rings
Nitrile rubber (NBR) is the general term for acrylonitrile butadiene copolymer. The acrylonitrile content of nitrile sealing compounds varies considerably (18% to 50%) and influences the physical properties of the finished material.
The higher the acrylonitrile content, the better the resistance to oil and fuel. At the same time, elasticity and resistance to compression set is adversely affected. In view of these opposing realities, a compromise is often drawn, and a medium acrylonitrile content selected. NBR has good mechanical properties when compared with other elastomers and high wear resistance. NBR is not resistant to weathering and ozone.
O-ring applications can be very demanding. GFS Engineers are available to consult on any O-ring application. Click here to contact a GFS Engineer.
Materials
NBR 70A
70A Durometer O-rings offered in a variety of import and domestic compounds. Materials in this category available for purchase include GFS NBR70A, Parker N0674-70, and Parco 4200-70.
NBR 90A
90A Durometer O-rings offered in a variety of import and domestic compounds. Higher durometer materials offer better extrusion resistance at higher pressures. Materials in this category available for purchase include GFS NBR90A, and Parco 4900-90.
Mil-P-25732
Mil-Spec material focused on performing in petroleum based hydarulic fluids in military aircraft. Materials available for purchase that meet this specification are FNST N432.
AMS-83461
Better dynamic performance and longer service life at 257°F than AMS-P-25732. Materials available for purchase that meet this specification are Parker N0756-75 and Parco 4367-70.
AMS-P-5315
AMS-P-5315 is a specification related to NBR O-rings and fuel resistance. Materials need to be able to perform within a temperature range of -65F and 180F. Materials available from GFS that meet this specification are Parker N0602 and Parco 4457-65.
AMS-P-5510
AMS-P-5510 is an aerospace specification governing O-rings that are installed in aircraft hydarulic systems. Materials need to be able to perform within a temperature range of -65F to 160F. Materials available from GFS that meet this specification are Parker N0507-90.
