The grease VNIINP-257 (GOST 16105-70) is a mix of an organic silicon liquid and dioctyl sebacate thickened with complex soda soap. It contains an antioxidizing additive and a molybdenum disulfide. The grease VNIINP-257 is defined as frost-resisting, possesses low water resistance. It is efficient in vacuum to 1 micro Pa and more low and at temperatures from -60 °С…+150 °С.
Application: bearings and low-power tooth gearings, carving connections of optical devices. A substitute product is VNIINP-258.
Appearance and color: —
Effective viscosity, Pas, at 0 °С, not more than: 35
Effective viscosity, Pas, at -50 °C, not more than: —
Strength at 20 °С, Pas, not less than: 80-100
Drop temperature, °С, not lower than: 190
Colloid stability under load of 300 g, %, not more than: 12
The content of free alkali in recalculation on NаОН, %, not more than: —
Penetration at 25 °С, mm, 10-1: —
Evaporation at 150 °С within 1 hour, %, not more than: —
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 mechanical-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.
