Exxon HyJet IV-A plus offers the following key features and benefits:

Features Advantages and Potential Benefits
Best in high temperature stability among Type IV fluids Longer fluid life.
Lesser need to replace fluid due to degradation.
Reduced hydraulic system maintenance costs
Lowest density Type IV fluid Reduced weight of the hydraulic fluid carried by aircraft.
Reduced aircraft fuel consumption, lower operating costs
Effective rust protection Reduced the risk of equipment damage in the event of major water contamination
Excellent low temperature flow (viscosity) properties Precise hydraulic system control and response even during extended range/polar flights.
Longer equipment life
Excellent deposit control Longer equipment life.
Reduced maintenance costs
Excellent protection against electro-chemical corrosion (erosion) Protection against servo valve and pump damage
Approved by all major aircraft manufacturers Use as fleet lubricant by airline operators
Fully compatible with all approved phosphate ester hydraulic fluids Flexibility in use by airline operators


Exxon HyJet IV-A plus fire-resistant aviation hydraulic fluid is used in commercial aircraft hydraulic systems where phosphate hydraulic fluids are recommended. It is compatible in all proportions with commercial Type IV and Type V phosphate ester aviation hydraulic fluids.

Exxon HyJet IV-A plus meets or exceeds the following industry and aircraft builder specifications.  It is approved against all commercial aircraft manufacturer requirements and is included in their Qualified Products Lists.


HyJet IV-A plus Meets Type IV, Low density Is in Qualified Products List
SAE Aerospace Standard AS1241C                      X          Not Applicable
Airbus NSA307110N                      X                      X
ATR NSA307110N                      X                      X
Boeing BMS 3-11P, Type IV, Grade B and Grade C                      X                      X
Boeing (Douglas Division) DMS 2014H, Type 4                      X                      X
British Aerospace (Avro) BAC.M.333C                      X                      X
Bombardier/Canadair BAMS 564-003A                      X                      X
Bombardier/DeHavilland                      X                      X
Cessna                      X                      X
Embraer                      X                      X
Fokker                      X                      X
Gulfstream Aerospace 1159SCH302J                      X                      X
Lockheed C-34-1224C                      X                      X

Typical Properties

  Test Method HyJet IV-A plus (1) Limits
Kinematic Viscosity, cSt ASTM D 445    
at -53.9ºC (-65ºF)   1320 2000 max
at -26.1ºC (-15ºF)   130 135 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 22  
Pour Point, ºC (ºF) ASTM D 97 ‹-62 (-80) -62 (-80) max
Specific gravity at 25ºC/25ºC (77ºF/77ºF) ASTM D 4052 0.996 0.990 -1.002
Density at 15.6ºC (60ºF), g/mL (lb/gal) ASTM D 4052 0.999 (8.35)  
Acid Number, mg KOH/g ASTM D 974 0.04 0.1 max
Water, Karl Fischer, mass % ASTM D 6304 0.1 0.2 max
Flash Point, ºC (ºF) ASTM D 92 176 (349) 160 (320) min
Fire Point, ºC (ºF) ASTM D 92 188 (370) 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   27/15 250/100 max
Sequence II   23/13 150/50 max
Sequence III   28/16 450/250 max
Particle count, NAS 1638 Class Auto Counter 4 7 max
Chemical Elements, ppm      
Calcium   103 120 max
Potassium   38 48 max
Chlorine   10 50 max
Sodium   1 15 max
Sulfur   224 350 max
Four-Ball Wear, Scar diameter at 75ºC/600rpm/1hour, mm Modified ASTM D 4172    
4 kg   0.22 0.45 max
10 kg   0.33 0.50 max
40 kg   0.73 0.55 – 0.85
Electrical Conductivity at 20ºC, microSiemens/cm   1.4 0.5 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 at 40 ºC, cal/g/ºC (same as Btu/lb/ºF)   0.41  
(1) Values may vary within modest ranges      


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