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 50-1-4UTest 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  


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