This SAE Aerospace Information Report (AIR) summarizes data and background relative to age control of specific classes of those nitrile type synthetic elastomers used in sealing devices which are resistant to petroleum base hydraulic fluids@ lubricating oils@ and aircraft fuels. This includes@ but is not limited to@ those nitrile (NBR or BUNA-N) elastomers previously covered by Section I of MIL-STD-1523. Purpose To provide users with appropriate references and information correlating past need and use of age controls with current needs and to provide summary guidelines for consideration when future use of age controls is required or contemplated.