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
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, cSt
ASTM D 445
at -53.9ºC (-65ºF)
1400
2000 max
at 37.8ºC (100ºF)
10.8
10.0 -11.0
at 98.9ºC (210ºF)
3.6
3.35 - 3.75
Viscosity Index
ASTM D 2270
320
Shear Stability, % Viscosity Drop at 40ºC
ASTM D 5621
21
Pour Point, ºC (ºF)
ASTM D 97
<-62 (-80)
-62 (-80) max
Specific Gravity at 25ºC/25ºC (77ºF/77ºF)
ASTM D 4052
0.998
0.993 -1.005
Density at 15.6ºC (60ºF), g/mL (lb/gal)
ASTM D 4052
1.003 (8.37)
Acid Number, mg KOH/g
ASTM D 974
0.05
0.1 max
Water, Karl Fischer, mass %
ASTM D 6304
0.1
0.2 max
Flammability
Flash Point, ºC (ºF)
ASTM D 92
174 (346)
160 (320) min
Fire Point, ºC (ºF)
ASTM D 92
185 (365)
177 (350) min
Autoignition Point, ºC (ºF)
ASTM D 2155
>427 (800)
400 (752) min
Foaming Tendency/Stability, mL foam/sec to collapse
ASTM D 892
Sequence I
0/0
100/100 max
Sequence II
0/0
75/50 max
Sequence III
0/0
100/250 max
Particle Count, NAS 1638 Class
Auto Counter
5
7 max
Chemical Elements, ppm
Calcium
7
20 max
Potassium
38
48 max
Chlorine
8
50 max
Sodium
5
15 max
Sulfur
50
200 max
Electrical Conductivity at 20ºC, microSiemens/cm
0.4
0.3 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)
