RU / EN
Technical Specifications 38.401-58-12-91 with the changes to 1.2
VNII NP-50-1-4U - high quality synthetic dee-ether oil. It contains more effective composition of additive than VNII NP-50-1-4F contains. This which allows to increase thermo-oxidative stability of the oil to 200°C with overheating up to 225°C while maintaining the excellent low temperature (possibility of application up to -60°C) and other characteristics. Oil VNII NP-50-1-4U is combined with the oil VNII NP-50-1-4F in all respects, does not require replacement of rubbers and construction materials and can be applied on existing promising technique.
VNII NP-50-1-4U is mostly used in military equipment.
VNII NP-50-1-4U can be also used in aircraft turbojet engines: civil aviation - the Il-96-300, Tu-204, Yak-42, An-74, An-124 Ruslan; military aviation - MiG – 23, MiG-27, MiG-29, An-72, Mi-26.
| Indicator name | Norm |
| Kinematic viscosity, mm2/s (St): | |
| at 100°C, not less | 3,2 |
| at minus 40°C, not more | 2700 |
| at minus 50°C not more than | 8500 |
| The flash point determined in open crucible °C, not below | 204 |
| Pour point, °C, not above | -60 |
| Thermal-oxidative stability at 200°C for 50 hours and air flow rate (10±0,5) dm3/h: |
|
| a) mass fraction of precipitate insoluble in isooctane, %, not more | 0,15 |
| b) acid number after oxidation, mg KOH/g oil not more than | 4,5 |
| C) kinematic viscosity after oxidation: |
|
| at minus 40°C, mm2/s (St), not more | - |
| at 100°C, mm2/s (St), not more | 3,7 |
| d) weight corrosion index after oxidation, mg/cm2, on LP: |
|
| alloy wrought aluminium brand AK4 (GOST 4784-74), max. | ±0,1 |
| of copper grade M1 or M2(GOST 859-78), max. | ±0,4 |
| steel SH-15 (GOST 801-78) | ±0,1 |