Exxon HyJet V

AIRCRAFT HYDRAULIC FLUID

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 extent of fluid degradation in aircraft systems will be less than Type IV fluids, in-service fluid life will be longer, and aircraft operator maintenance costs will 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.

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 the 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

Application

Exxon HyJet V is designed for use in commercial aircraft phosphate ester hydraulic systems. It meets the SAE AS1241 requirements and is included in the Airbus NSA307110 qualified products list. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.

Typical Properties


Test Method Results Limits
Kinematic Viscosity, cStASTM D 445  
at -53.9ºC (-65ºF) 14002000 max
at 37.8ºC (100ºF) 10.810.0 -11.0
at 98.9ºC (210ºF) 3.63.35 - 3.75
Viscosity IndexASTM D 2270320 
Shear Stability, % Viscosity Drop at 40ºCASTM D 562121 
Pour Point, ºC (ºF)ASTM D 97<-62 (-80)-62 (-80) max
Specific Gravity at 25ºC/25ºC (77ºF/77ºF) ASTM D 40520.9980.993 -1.005
Density at 15.6ºC (60ºF), g/mL (lb/gal) ASTM D 40521.003 (8.37) 
Acid Number, mg KOH/gASTM D 9740.050.1 max
Water, Karl Fischer, mass %ASTM D 63040.10.2 max
Flammability   
Flash Point, ºC (ºF) ASTM D 92174 (346)160 (320) min
Fire Point, ºC (ºF)ASTM D 92185 (365)177 (350) min
Autoignition Point, ºC (ºF)ASTM D 2155>427 (800)400 (752) min
Foaming Tendency/Stability, mL foam/sec to collapseASTM D 892  
Sequence I 0/0100/100 max
Sequence II 0/075/50 max
Sequence III 0/0100/250 max
Particle Count, NAS 1638 ClassAuto Counter57 max
Chemical Elements, ppm   
Calcium 720 max
Potassium 3848 max
Chlorine 850 max
Sodium 515 max
Sulfur 50200 max
Electrical Conductivity at 20ºC, microSiemens/cm 0.40.3 min
Bulk Modulus, Isothermal secant at 100ºF/3000 psi, psi 210,000 
Thermal Conductivity at 40ºC, cal/sec/cm2/ºC (Btu/hr/ft2/ºF) 33x10-5 (0.0799) 
Coefficient of Thermal Expansion, 25 to 100ºC, per ºC (per ºF) 0.00086 (0.00048) 
Specific Heat Capacity, cal/g/ºC (same as Btu/lb/ºF) 0.42