The grease NK-50 (TU 38.10111219-95) is an aviation grease. It is the oil МС-20 solidified with a soda soap stearin and oleic acids, contains colloid graphite.
The basic operational characteristics: low water-and frost resistance. It is efficient at temperature-15 … +120°С. The Scope: bearings of naves of the chassis of planes.
Appearance and colour: Homogeneous oily ointment from grey-green to black colour
Viscosity effective, Па.с, at 0°С, no more: 1000
Viscosity effective, Па.с, at-30°S, no more: —
Strength at 50°С, the Pas, not less: 180
Drobfall temperature, °С, not more low: 190
Colloid stability at loading, %, no more: 7
The content of free alkali in recalculation on NаОН, %, no more: 0.1
Penetration at 25°С, mm, 10-1: —
The content of water, %, no more: —
Vaporability at 120°С within 1 hour, %, no more: —
Data on operational temperatures represent values which are guided by a structure of lubricants, and also on a scope and technology of use. Depending on a kind of mehaniko-dynamic loading lubricants change the consistence, conditional viscosity or viscosity at various temperatures, pressure and duration of operation. These changes of indicators can affect work of components.