Sapfir (VNII NP-261)
Sapfir (VNII NP-261) is used for lubrication of aircraft landing gear hubs conical roller bearings within the temperature range from -60°C to +150°C, with occasional short-time surges of up to 200°C.
|Drop point, °C, min.||250|
|Penetration at 25°C, 0,1 mm||265-295|
|Point of break at 20°C, Pa||240-420|
|Viscosity at 0°C and rate of deformation average gradient 10s-1, Pa•s, max.||7|
|Colloid stability, %, max.||5|