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Krytox™ 240AC Grease

Krytox™ 240AZ, 240AB, and 240 AC are MIL PRF-27617 greases. If Krytox™ 240 AZ is ordered to meet MIL-SPEC requirements, it must be ordered as NLGI Grade 1 to meet the specification.


Krytox™ 240AC, 240AB, and 240 AZ gr-1 greases now have NSF approval for incidental food contact (H-1) in and around food processing areas.

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  • MIL PRF-27617
  • NSF H-1 Rated
  • ASTM D445
  • ASTM D2595
  • ASTM D97
  • ASTM D217
  • ASTM D942
  • ASTM D2512
  • ASTM D6184

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  • Bearings
  • Seals
  • Valves
  • Oxygen Devices
  • O-Rings
  • Threads

Krytox 240AC


Krytox 240AC grease is based on perfluoropolyether (PFPE) oils. These synthetic fluorinated lubricants are used in extreme conditions such as continuous high temperatures up to 300 °C (572 °F) and higher temperatures for shorter periods, depending on product grade limits. Chemically inert and safe for use around hazardous chemicals, these lubricants are non-flammable and are safe for use in oxygen service. Krytox oils and greases are silicone free and do not damage plastics or elastomers or cause corrosion to metals. They are commonly used as lubricants in aerospace, automotive, industrial and semiconductor applications as well as solving many other routine lubrication problems. Krytox greases are the original products that this military specification was written for and have been certified continuously since the specification was originally written. This is the latest data from the recertification that is required every five years. Krytox greases are standard as NLGI Grade 2 penetration. If the 240 AZ is ordered to meet MIL-SPEC requirements, it must be ordered as NLGI Grade 1 to meet the specification.


Applications for Krytox 240AC lubricants are generally of a critical nature with temperatures in all industries reaching extremes for conventional lubricants. They are expected to be durable in the most aggressive environments and are now often considered an integral part of the design. Where failure of components is not an option, whether because of durability, warranty, safety, loss of productivity or down time, Krytox is the lubricant of choice in a wide range of industries and applications.


In the aerospace industry, Krytox 240AC grease is applied to various settings spanning from bearings and sealants to o-rings and oxygen systems. Krytox is a valuable asset to the aerospace industry due to its superior performance in a wide range of temperatures scaling from 70 to 399ºC (–100 to 750 ºF). In addition, it is robust in harsh environments and has excellent frictional properties, allowing it to resist change in properties over time, provide longer wear, and lower energy consumption. Krytox lubricants are compatible with all metals, elastomers, plastics, paints, and finishes. Due to the intense and severe circumstance of the aerospace industry, it can be expected that Krytox delivers a high level of product excellence.