Krytox™ 240AC Aerospace Grease

Aviation grease meeting the requirements of MIL-PRF-27617 type III (NATO number G-399) for aircraft and devices, resistant to fuel and oxidants.

Krytox™ 240AC is a white grease that is non-reactive, non-flammable, safe in chemical and oxygen environments and extremely durable. Meets MIL-PRF-27617 type I, II and III standards.

Application

• bearings,
• gears,
• seals,
• o-rings,
• manometers,
• valves,
• gaskets and quick couplers
• oil tank mounting bracket for Trent 1000 engine.
  
• Connectors, valves, regulators and gaskets for oxygen installations
• Liquid propellant rocket engines and ground systems support
• Instruments, gyroscopes and gimbals
  
• Seals, valves and pneumatics
  
• Lead and ball screws
• Electromechanical actuators
• Spline clutches of the engine's auxiliary gearbox
• Anti-friction bearings, engine oil tanks
• Non-conductive grease for sealing electrical installations of connectors
• IR sensors and optics

Features and benefits

• Chemically inert
• Operation over a wide temperature range
• Low gassing
• Incombustible
• Non-toxic, chemically inert and non-evaporating
• Unaffected lubricity and viscosity over a wide temperature range: -34°C to 288°C
• Stable physical properties over time, including radiation resistance
• Virtually insensitive to harsh environmental conditions and harsh chemicals
• Resistant to vapor loss in vacuum (e.g. during high-altitude orbit or spaceflight)
• Long wear and low energy consumption due to excellent friction reducing properties
• Compatible with most metals, elastomers, plastics, paints and finishes
• Meets the following specifications:
  MIL-PRF-27617 Type III
  NATO#G-399
  NSF H-1 Food Grade -
  
• National Stock Numbers (NSN):
  9150-01-008-0495
  9150-00-961-8995
  9150-01-543-2899
  9150-12-307-2645
  9150-12-338-4838
  9150-99-784-3607
  9150-12-349-5329
  9150-00-083-5589
  91 50-00-726-3553
  

ASTM D-3336 test result
Bearing operation without exceeding set motor overloads and overtorque set point or above temperature limits .
Used Krytox Grease from the Aerospace series

Krytox 240AC product specification

• Viscosity (cSt):
  @ 38°C (100°F): 270
  
• Base oil vapor pressure:
  @ 38°C (100°F): 8 x 10 e -8
  
• Base oil volatility (wt% loss in 22 hours):
  @ 149°C (300°F): 0
  @ 204°C (400°F): <1
  
• Base Oil Pour Point: -35°C (-30°F) )
• Texture: buttery
• NLGI Grade: 2
• Mechanical stability (ASTM D217 10,000 and 100,000 blows): no change
• Oxidative stability at 99°C (210°F): 0 psig pressure drop after 600 hours.
• Impact of liquid oxygen (ASTM D2512, NASA MSFC 106B): pass
• Grease density (at 25°C/77°F): 1.93g/mL
• Oil separation (weight % loss in 30 hours):
  @ 99°C (210°F): 3
  @ 204°C (400°F): 11
  
• Estimated usable range: -34°C to 288°C (-30°F to 550°F)
• Qualification Reference: AFPET/PTP 08-012
• MIL-Spec: MIL-PRF-27617 Tyler 2
• NATO number: G-399
• Working Penetration Change: +3
• Copper corrosion (max. 2b): 1b
• High temperature Bearing performance (min. 500 hrs @ 10,000 rpm, 204°C): Stop after 1320 hrs.
• % evaporation (ASTM D-2595): 10.1
• Solubility in fuel (%): 0.3
• Water leaching characteristic (%): 0.25
• Number of impurities:
  75 microns and larger: 0
  25-75 Micron:0
  
• Resistance to aqueous solutions:
  Distilled water: Complies
  50/50 Distilled Water/Ethanol: Positive
  
• Layer stability and corrosion on steel: Positive
• Primary chemistry: PFPE

Typical parameters of Krytox Aerospace Grease

Storage and durability

Due to the inert, non-oxidizing nature of the ingredients, Krytox™ greases and oils have an indefinite shelf life if left unopened and stored in a clean, dry place.