Grease VNIINP-261 SAPPHIRE (TU 38.1011051-87) is aviation grease. The basic operational characteristics: high thermal stability, mechanical and antioxidizing stability. It is efficient at temperature-40 … +150°С, it is short-term to +200°С.
Scope: conic roller bearings of naves of wheels of the chassis of flying machines.
Appearance and colour: Smooth ointment from sine-grey to black colour. The greenish shade is supposed
Viscosity effective, Па.с, at 0°С, no more: —
Viscosity effective, Па.с, at-40°S, no more: 3000
Strength at 20°С, the Pas, not less: 300-800
Drobfall temperature, °С, not more low: —
Colloid stability at loading 300 г, %, no more: 10
The content of free alkali in recalculation on NаОН, %, no more: —
Penetration at 25°С, mm, 10-1: —
Vaporability at 150°С during 1 ч, %, no more: 3
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.