NK-50 is the MC-20 oil thickened with the stearine and olein sodium soap. It contains colloidal graphite.
NK-50 is used for the aircraft landing gear hubs within the temperature range from -15°C to +120°C. Its former brand name was ST – (high-heat aircraft-engine grease).
|Drop point, °C, min.||200|
|Penetration at 25°C, 0,1 mm||170-225|
|Point of break at 20°C, Pa||700-1200|
|Viscosity at 0°C and rate of deformation average gradient 10s-1, Pa•s, max.||1000|
|Colloid stability, %, max.||7|