EXXONMOBIL® MOBIL™ AERO Series Aviation Hydraulic Fluids includes AERO HFA, HF, and HFS hydraulic fluids offered for aircraft systems where use of hydrocarbon hydraulic fluids is required.
They are low viscosity, high VI (viscosity index) fluids with excellent low temperature properties, good anti-wear performance, and good chemical stability.
MOBIL™ AERO HFA is a premium quality fluid that meets the requirements of the U.S. Military specification MIL-H-5606A (obsolete). It has a very high VI and is suitable for use at temperatures down to -54 ˚C (-65 ˚F). While this quality fluid is no longer used by the US Military, it is still used in some older, small private, and small commercial aircraft. It is also used in industrial and commercial equipment requiring good fluidity at very low temperatures, where MOBIL™ AERO HFA provides long, trouble-free service over a wide range of
MOBIL™ AERO HF is a premium quality fluid that is approved against the most current version of U.S. Military specification MIL-PRF-5606. It has physical properties very similar to MOBIL™ AERO HFA, and also meets “super-clean” requirements required by modern aircraft hydraulic systems. It is intended primarily for military aircraft. It is also used as a hydraulic fluid for small private and small commercial aircraft, and as a strut fluid in landing gear of large commercial aircraft. It is approved as a NATO Code Number H-515 fluid.
MOBIL™ AERO HFA and HF are composed of mineral oil base stocks and contain shear-stable VI improvers.
MOBIL™ AERO HFS is a synthetic polyalphaolefin lubricant that is approved against the most current version of U.S. Military specification MIL-PRF-83282. It does not contain a VI improver. It is designed for use at temperatures down to -40˚C (-40˚F). It provides better flammability and volatility, improved stability, but has a higher viscosity at low temperature than MOBIL™ AERO HF. It meets the “super-clean” requirements. It is intended primarily for US Military aircraft. It is approved as a NATO Code Number H-537 fluid.
For additional information please consult the supplied documentation.