The grease VNIINP-231 (GOST 38.1011220-89) is organic silicon liquid thickened with technical carbon (soot) DG-100.
The basic operational characteristics: the grease VNIINP on properties occupies intermediate position between greases and semifluid pastes. Cold resistant. It is efficient at residual pressure 666.5 Pas and temperatures from -60 °С…+250 °С. Application: the closed worm-screw bearings of a rolling and sliding, carving connections.
Appearance and color: Homogeneous ointment of black color
Effective viscosity, Pas, at 50 °С, not more than: 1
Effective viscosity, Pas, at -50 °C, not more than: 400
Strength at 80 °С, Pas, not less than: 150
Drop temperature, °С, not lower than: 180
Colloid stability under load of 300 g, %, not more than: 7.5
The content of free alkali in recalculation on NаОН, %, not more than: —
Penetration at 25 °С, mm, 10-1: not rated
Evaporation at 200 °С, %, not more than: 5
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.