Krytox 240AC grease is applied on various settings in the aerospace industry, from bearings and sealants to o-rings and oxygen systems. It’s a high temperature grease, NLGI Grade 2, Synthetic oil base, 0.5 oz that meets MIL-PRF-27617. Krytox grease and oil lubricants have an indefinite shelf life, if unopened and stored in a clean dry location.