The VNIINP-50-1-4f oil (GOST 13076-86) is a synthetic diester oil obtained by chemical synthesis. It contains additives that improve the basic operational qualities such as thermal-oxidative stability and anti-wear properties.
It is used in gas turbine engines with oil outlet temperatures up to 175 °C and in turbo refrigerators.
VNIINP-50-1-4f oil belongs to the class of oils for modern engines that require properties that cannot be provided by existing oil refining technology.
Compared to mineral oils, synthetic oils based on diesters are characterized by higher viscosity indexes and thermal stability, lower freezing temperatures, lower volatility, and fire hazard. In addition, diester oil blends well with mineral oils. Having a high solvency, diester oil dissolves sludge and varnish, maintaining the engine's parts clean.
Practice has shown that diester oil is capable of removing deposits that have formed in the engine as a result of using other oils.
Technical specifications of VNIINP-50-1-4f oil (GOST 13076-86)
|Parameter||Standard (TU) according to GOST|
|Kinematic viscosity, mm2/s:|
|at 100°C, not less than||3.2|
|at -30°C, not more than||-|
|at -40°C, not more than||2000|
|at -54°C, not more than||11000|
|Flash point, open cup, not less than||204|
|Pour point, not higher than||-60|
|Acid number, mg KOH/g, not more than||0.20|
|Water-soluble acids, alkalis, mechanical impurities, water||None|
|Thermo-oxidative stability, h (temperature, °C)||50(175), (air 10 dm3/h)|
|Indicators after oxidation:|
|Kinematic viscosity, mm2/s, not more than:|
|Change in viscosity at 100°C, not more than||7.0|
|Acid number, mg KOH/g, not more than||0.4|
|Mass fraction of residue insoluble in iso-octane, %, not more than||0.30|
|Corrosion on plates, g/m2:|
|Copper M1 and M2||±1.5|
|Aluminum alloy AK4||±2.0|
|Coking ability, %, no more than||-|
|Density at 20°C, kg/m3, no more than||926|
|Tribological characteristics on the TShMT at (20±5)°C:|
|Critical load, N, not less than||840|
|Wear rate at axial load of 196 N, not more than||0.40|