NK-50 grease

NK-50 grease (TC 38.10111219-95) - aviation grease; NK-50 is the MC-20 oil thickened with the stearine and olein sodium soap. It contains colloidal graphite. Main operational characteristics: low water and frost resistance. NK-50 is used for the aircraft landing gear hubs within the temperature range from -15°C to +120°C.

Physical and chemical indicators of NK-50 grease (TC 38.10111219-95)

Name of the indicator Norm GOST (TC)
Appearance Ointment with smooth structure of light yellow to brown color
Drop temperature, °C, not lower than 200
Tensile strength at 50°C, Pa, not less than 250
Effective viscosity at -50°C and mean gradient of strain rate 10 s-1, Pa-s, not more than 2000
Colloidal stability, % of allocated oil, not more than 15,0
Evaporability at 150°C, 1h, %, not more 2,0
Corrosive influence on metals Withstands
Content of water Absence
Content of mechanical impurities with a diameter more than 0,1 mm Absence
Mass fraction of free alkali calculated as mg KOH, not more than 2,0