Oem has indicated the shelf life is unlimited
A natural, reclaimed, or synthetic rubber composition, sometimes mixed with a small amount of granulated cork. It may be all rubber, or the rubber may be coated or impregnated to a woven textile fabric; the adhesive side is usually backed with a holland linen fabric. It is used as a moisture, oil, flame, and grease-resistant sealer between metal joints and as a sealing and packing agent around door and window panels. Excludes: tape, insulation, electrical; tape, pressure sensitive adhesive; tape, semi-conducting, electrical; and tape, shielding, electrical.
Classification: Gaskets, washers and other seals, of vulcanized rubber other than hard rubber
NSN 5930-00-890-8502
NSN 4140-01-206-4981
NSN 5920-01-030-3611
NSN 5935-00-445-5845
NSN 5930-01-614-2557
NSN 5905-01-131-3966
NSN 6645-01-491-5553
NSN 5960-00-570-6986
NSN 6220-01-625-0944
NSN 5910-00-122-5460
NSN 6145-01-176-2503
NSN 6645-00-106-0140