Mobil Aero HF Series

ExxonMobil aviation , Burkina Faso

Aviation Hydraulic Fluids

Product Description

Mobil Aero HFA and HF are formulated for aircraft systems where use of hydrocarbon-based hydraulic fluids is required. They are low viscosity products, high VI (viscosity index) fluid with excellent low temperature properties, good anti-wear performance, and good chemical stability. Mobil Aero HFA and HF are composed of mineral base oil stock and contain shear-stable VI improvers.


Features and Benefits

Mobil Aero HF Series aviation hydraulic fluids are designed to meet the demanding requirements of commercial and military aircraft applications. These high quality formulations have a long history of excellent performance and provide long, trouble-free service over a wide range of operating conditions.


Product features and potential benefits include:


Advantages and Potential Benefits

High Viscosity Index (VI)

Allows equipment operation over a wide range of temperatures

Excellent low temperature properties

Provides high performance operation in low ambient conditions

Good chemical and oxidation stability

Resists the formation of acidic constituents, varnishes, and deposits

Meets "super clean" requirements of U.S. Spec. MIL-PRF-5606 (Aero HF)

Ensures reliable performance of pumps, servo-valves and other hydraulic system components



Mobil Aero HFA is a premium quality fluid that meets the quality requirements of the U.S. Military specification MIL-H-5606A (now obsolete). It has a very high VI and is suitable for use at temperatures down to -54 ºC (-65 ºF). While this quality fluid is no longer used by the U.S. Military, it is still used in some older, small private, and 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 operating conditions.


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, but it is also used as a hydraulic fluid for small private and commercial aircraft, and as a strut fluid in landing gear of large commercial aircraft. It is a NATO Code Number H-515 fluid.


Specifications and Approvals

This product is recommended for use in applications requiring:







This product meets or exceeds the requirements of:






NATO H-515




Properties and Specifications




API Gravity, °API, ASTM D287



Acid Number, mgKOH/g, ASTM D664


0.03 (0.2 max)

Barium, mg/kg, ASTM D5185

<1 (10 max)


Bulk Modulus, Isothermal secant at 40 C/4000 psi, psi, ASTM D6793

200,000 min

200,000 min

Color, Visual



Copper Strip Corrosion, 72 hrs at 135 C, ASTM D130

1B (2E max)

1B (2E max)

Corrosion and Oxidation Stability, 168 hours at 135 C, Rating, ASTM D4636



Density @ 60 F, lb/gal, CALCULATED



Evapor. Loss, 6H at 71C, mass %, ASTM D972

12 (20 max)


Flash Point, Cleveland Open Cup, °C, ASTM D92


107 (93 min)

Flash Point, Pensky-Martens Closed Cup, °C, ASTM D93

96 (82 min)


Foam, Sequence I, Stability, ml, ASTM D892



Foam, Sequence I, Tendency, ml, ASTM D892


36 (65 max)

Four-Ball Wear Test, Scar Diameter, mm, ASTM D4172

0.6 (1.0 max)


Four-Ball Wear Test, Scar Diameter, 40 kg, 1200 rpm, 1 h, 75 C, mm, ASTM D4172


0.6 (1.0 max)

Kinematic Viscosity -40 F, cSt, ASTM D445


450 (500 max)

Kinematic Viscosity 130 F, cSt, ASTM D445


10.4 (10.0 min)

Kinematic Viscosity @ -40 C, mm2/s, ASTM D445

450 (600 max)


Kinematic Viscosity @ -54 C, mm2/s, ASTM D445

2000 (2500 max)


Kinematic Viscosity @ 100 C, mm2/s, ASTM D445

5.2 (4.9 min)


Kinematic Viscosity @ 40 C, mm2/s, ASTM D445

14.0 (13.2 min)


Low Temperature Stability, 72 hrs @ - 54 C, FTM 3459



Low Temperature Stability, 72 hrs @ - 54 C, FTM 791.3458



Particulate Contamination, mg/100ml, ASTM D4898

0.2 (0.3 max)


Pour Point, °C, ASTM D97

-62 (-60 max)

-64 (-60 max)

Shear Stability, %KV loss, ASTM D2603

15 max


Specific Gravity 60 F / 60 F, ASTM D4052



Specific Gravity, 15.6 C/15.6 C, ASTM D4052



Viscosity Index, ASTM D2270



Water Content, mg/kg, ASTM D6304

50 (100 max)


Water, Karl-Fischer, ppm, ASTM D1744


50 (100 max)


Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.


Exxon Mobil Corporation
22777 Springwoods Village Parkway
Spring TX 77389
For additional technical information or to identify the nearest U.S. ExxonMobil supply source, call +1 800 662-4525.

Due to continual product research and development, the information contained herein is subject to change without notification.  Typical Properties may vary slightly.