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Exxon HyJet V is a Type V fire-resistant phosphate ester hydraulic fluid, which is superior in thermal and hydrolytic stability to commercially available Type IV hydraulic fluids.

Better stability means the extent of fluid degradation in aircraft systems will be less than Type IV fluids, in-service fluid life will be longer, and consequently aircraft operator maintenance costs may be lower.



    HyJet V provides excellent high and low temperature flow properties (kinematic viscosities) and rust protection. HyJet V has also demonstrated an improvement over the erosion protection performance afforded by Type IV fluids. Exxon HyJet V offers the following key features and benefits:
    Features Advantages and Potential Benefits
    Higher stability than Type IV fluids Longer fluid life, Lesser need to replace fluid due to degradation, Reduced hydraulic system maintenance costs
    Meets Boeing BMS 3-11 and SAE AS1241 Type IV and Type V requirements Improved flammability characteristics over meeting just the Type V requirements
    Low density Reduced weight of the hydraulic fluid carried by aircraft, Reduced aircraft fuel consumption, Lower operating costs
    Excellent rust protection Reduced risk of equipment damage in the event of major water contamination
    Excellent low and high temperature viscosity balance Precise hydraulic system control and response even during extended range/polar flights, Longer aircraft hydraulic system equipment life
    Excellent deposit control Longer aircraft hydraulic system equipment life, Reduced maintenance costs
    Improved protection against electro-chemical corrosion (erosion) Protection against servo valve and pump damage
    Fully compatible with all approved Type IV and Type V phosphate ester hydraulic fluids Flexibility in use by airline operators

    Exxon HyJet V is designed for use in commercial aircraft phosphate ester hydraulic systems. It meets the SAE AS1241 requirements and is included in commercial and business airframe manufacturer Qualified Products Lists, as shown below. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.


    HyJet V Meets Is In Qualified Products List
    SAE Aerospace Standard AS1241 Type V X Not Applicable
    Airbus NSA 307110N Type V X X
    Boeing BMS 3-11P Type V, Grade A and Grade C X X
    Boeing-Long Beach DMS 2014H Type 5 X X
    ATR NSA307110N Type V X X
    Gulfstream 1159SCH302J Type V X X

      Test Methods Mobilgrease 28 Typicals (1) MIL-PRF-81322 Limits
    Kinematic Viscosity, cSt ASTM D 445    
    at -53.9ºC (-65ºF)   1350 2000 max
    at -26.1ºC (-15ºF)   132 135 max
    at 37.8ºC (100ºF)   10.6 10.0 - 11.0
    at 98.9ºC (210ºF)   3.6 3.35 - 3.75
    at 127.6ºC (260ºF)   2.6 1.5 min
    Viscosity Index ASTM D 2270 280  
    Shear Stability, % Viscosity Drop at 40ºC ASTM D 5621 21  
    Pour Point, ºC (ºF) ASTM D 97 ‹-62 (-80) -62 (-80) max