VNIINP-261 grease “Sapphire”

VNIINP-261 Sapphire grease (TC 38.1011051-87) is an aviation grease. Main performance characteristics: high thermal, mechanical and oxidative stability. It is efficient within the temperature range from -40 to + 150°С, for a short time up to + 200°С.

VNIINP-261 Sapphire grease is used in gear joints of aircraft and helicopter screws. In addition, Sapphire grease is used in heavily loaded conical roller bearings and threaded connections of aircraft landing gear.

It is currently the best domestic aviation grease. It has high antioxidant and mechanical stability and outstanding thermal resistance. Temperature range of application is from -40 to + 150°С. The grease can withstand short-term heating up to + 200°С. When tested at TsKB-60 stand shows better results not only in comparison with the NK-50 grease, but also in comparison with the French Nyco-22 (Aeroshell 22) grease.

Physical and chemical indicators of VNIINP-261 grease "Sapphire"  (TC 38.1011051-87)

Name of the indicator Norm GOST (TC)
Appearance and color Ointment of blue-gray to black color with smooth structure. A green tint is permissible.
Drop temperature, °C, not lower than 250
Effective viscosity, Pa-s, at -40 °C, not more than 3000
Tensile strength at 50°C, Pa 300 - 800
Colloidal stability of allocated oil, %, not more than 10
Corrosive influence on metals Withstands
Evaporability at 150°С, %, 1H, not more than 3,0
Content of water Absence