VNII NP 50-1-4F
GOST 13076-86
VNII NP 50-1-4F - is a high-quality synthetic diester oil containing additives, which increase its anti-wear properties and thermo-oxidizing stability.
It doesn't contain silicium (Si<30ppm).
VNII NP 50-1-4F approved and applied for such turbofan engines as:
- AL-31FN (for China's fighters J-10, J-11B), AL-31 F and its modifications AL-31FP, AL-31FM1 (Su-27, Su-27SK, Su-27SKM, Su-30MK, Su-30MK2, Su-33, Su-35),
- Ai-222-25 (Yak-130),
- R-15B-300 (Mig-25, Mig-25RB, Mig-25P),
- R29-300,
- RD-33 and its modifications RD-93, RD-33 vol. 3, RD-33B/NB, RD-33MK, SMR-95 (Mig-29, Mig-29OVT, Mig-29K, Mig-35),
- RD-1700 (Mig AT),
- D-36, D-436, D-18T, D-27 and those modifications,
- other turbofan and gasturbine engines.
VNII NP 50-1-4F is used in turbojet aircraft engines with the outlet oil-temperature of up to 175°C (Il-96-300, Tu-204, Yak-42, An-74 and An-124 ‘Ruslan’ civil aircraft; An-72, MiG-21, MiG-23, MiG-27, Su-15, Su-17, Su-20, Su-24, Su-25, Su-27 and Tu-22 military aircraft and Mi-26 helicopters). VNII NP 50-1-4f is also used in the aircraft air-conditioning systems cooling turbines and in the gas-compressor plants gas-turbine engines.
| Oil parameters in accordance with regulatory documentation (GOST/TU) | VNII NP 50-1-4F GOST | VNII NP 50-1-4F average values | Test method |
|---|---|---|---|
| Kinematic viscosity, mm2/с (cSt): | GOST 33-2000 | ||
| at 100°С, min. | 3,2 | 3,218 | |
| at minus 40°С, max. | 2000 | 1621 | |
| at minus 54°С, max. | 11000 | 10329 | |
| Pour point, °C, max. | -60 | below -60 | GOST 20287-91 |
| Open flash point, °C, min. | 204 | 229 | GOST 4333-87 |
| Acid number, mg KOH per 1 g of oil, max. | 0,20 | 0,021 | GOST 5985-79 |
| Water-soluble acid and alcalis content, % | Absent | Absent | GOST 6307-75 |
| Water content | Absent | Absent | GOST 1547-84 |
| Mechanical impurities content,% | Absent | Absent | GOST 6370-83 |
| Density at 20°C, g/cm3, max. | 0,9260 | 0,924 | gost 3900-85 |
| Ash content %, max. | 0,1 | 0,022 | 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) | (77) | |
| wear variable (Diameter Wear), mm, at axial load 196N (20kgf), max. | 0,4 | 0,32 | |
| Thermal-oxidative stability at 175°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. | 0,3 | 0,022 | |
| b) acid number after oxidation, mg KOH/g of oil, max. | 0,4 | 0,074 | GOST 5985-79 |
| c) kinematic viscosity after oxidation at minus 40°C, mm2/s (cSt), max.: | 3500 | 1654 | |
| d) weight corrosion index after oxidation, g/dm2 (mg/cm2 ), on plates made of: | |||
| - wrought aluminum alloy, grade AK4 (GOST 4784-74), max. | ±2,0 | Absent | |
| - made of grade M1 or M2 copper (GOST 859-78), max. | ±1,5 | Absent | |
| - steel grade SHH-15 (GOST 801-78) | Absent | Absent |
