VNII NP 50-1-4U
TU 38.401-58-12-91 WITH AMEND 1-4
VNII NP 50-1-4U is a synthetic diester oil with a highly-efficient additives package, which permits to use it within the temperature range from -60°C to 200°C with the oil overheating parameter of up to 225°C. It can be used instead of IPM-10, VNII NP 50-1-4F, Turbonycoil 210A (TN 210A), Mobil Turbo 319A-2 (MT 319A-2) and other oils, don't demands replacement of rubber parts or construction materials, and is fully compatible with VNII NP 50-1-4F in any/all parities.
This oil is approved for use in all aircraft turbofan and gas-turbine engines. Currently it is used as one of the basic lubricants for the military hardware. It is recommended for advanced machinery such as Su-35 with 117S turbofan engines, Mig-35, Mig-29OVT with RD-33/RD-93 turbofan engines.
It is used in gas-turbine engines of Sukhoi (Su), Mikoyan (Mig), Tupolev (TU), Ilushin (Il), Yakovlev (Yak) and Antonov (An) military and civil aircraft and in the turbo-compressor unit of Mi-26 helicopters power-plant assemblies, as well as in aircraft gas-turbine engines of gas-compressing plants.
| Oil parameters in accordance with regulatory documentation (GOST/TU) | VNII NP 50-1-4U | Test method |
|---|---|---|
| Kinematic viscosity, mm2/с (cSt): | GOST 33-2000 | |
| at 100°С, min. | 3,2 | |
| at minus 40°С, max. | 2700 | |
| at minus 54°С, max. | 8500 | |
| Pour point, °C, max. | -60 | GOST 20287-91 |
| Open flash point, °C, min. | 204 | GOST 4333-87 |
| Acid number, mg KOH per 1 g of oil, max. | 0,25 | GOST 5985-79 |
| Water-soluble acid and alcalis content, % | Absent | GOST 6307-75 |
| Water content | Absent | GOST 1547-84 |
| Mechanical impurities content,% | Absent | GOST 6370-83 |
| Density at 20°C, g/cm3, max. | 0,9280 | gost 3900-85 |
| Ash content %, max. | 0,1 | GOST 1461-75 |
| Tribological characteristics, taken with a four-ball tester at the air temperature of: | GOST 9490-75 | |
| critical load (Pk), N (kgf), min. | 735 (75) | |
| wear variable (Diameter Wear), mm, at axial load 196N (20kgf), max. | 0,45 | |
| Thermal-oxidative stability at 200°C within 50 hours and the air consumption of 10±0,5 dm3/hour | GOST 23797-79 | |
| а) mass content of residue, insoluble in isooctane, %, max. | 0,15 | |
| b) acid number after oxidation, mg KOH/g of oil, max. | 4,5 | GOST 5985-79 or GOST 11362-96 |
| c) kinematic viscosity after oxidation at 100°C, mm2/s (cSt), max.: | 3,7 | |
| d) weight corrosion index after oxidation, g/dm2 (mg/cm2 ), on plates made of: | ||
| - wrought aluminum alloy, grade AK4 (GOST 4784-74), max. | ±0,1 | |
| - made of grade M1 or M2 copper (GOST 859-78), max. | ±0,4 | |
| - steel grade SHH-15 (GOST 801-78) | ±0,1 |
