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 |