Mobil Aero HF

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:

FeaturesAdvantages and Potential Benefits
High Viscosity Index (VI)Allows equipment operation over a wide range of temperatures
Excellent low temperature propertiesProvides high performance operation in low ambient conditions
Good chemical and oxidation stabilityResists 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

         Mobil Aero GradeHFAHF
MIL-H-5606A (obsolete) quality level   X
MIL-PRF-5606 approved   X
NATO Code H-515   X

Typical Properties

Mobil Aero Grade(1)Test MethodHFAHF
API Gravity3029
Specific Gravity, 60ºF/60ºFASTM D 40520.8720.872
Density at 60ºF, lb/galASTM D 40527.267.26
Pour Point, ºCASTM D 97-64 (-60 max)-62 (-60 max)
Flash Point, COC, ºCASTM D 92107 (93 min)107
Flash Point, PMCC, ºCASTM D 939296 (82 min)
Acid Number, mg KOH/gASTM D 6640.03 (0.2 max)0.04 (0.2 max)
Barium Content, ppmASTM D 5185‹1 (10 max)
Kinematic Viscosity, cStASTM D 445
at 100ºC5.25.2 (4.9 min)
at 40ºC1414.0 (13.2 min)
at -40ºC450 (500 max)450 (600 max)
at -54ºC19002000 (2500 max)
at 130ºF10.4 (10.0 min)
Viscosity IndexASTM D 2270370370
Low Temperature StabilityFTM 791.3459 Pass
72 hours at -54ºCFTM 791.3458Pass
Copper Corrosion, 72 hours at 135ºCASTM D 1301b (2e max)1b (2e max)
Oxidation Corrosion Stability, 168 hours at 135ºCASTM D 4636PassPass
Water Content, Karl Fischer, ppmASTM D 630450 (100 max)50 (100 max)
4-Ball Wear Scar, 1 hour, 1200 rpm, 75ºC, 40 kg, mmASTM D 41720.6 (1.0 max)0.6 (1.0 max)
Evaporation Loss, wt %ASTM D 972
6 hours at 71ºC12 (20 max)
Particle CountAuto Counter
5-15 microns1000 (10000 max)
15-25 microns100 (1000 max)
25-50 microns30 (150 max)
50-100 microns5 (20 max)
100+ microns0 (5 max)
Particulate Contamination, mg/100 mLASTM D 48980.2 (0.3 max)
Foam, Seq I, mL/mLASTM D 89236/3 (65/0 max)37/2 (65/0 max)
Nitrile Rubber L Swell, 168 hours at 70ºC, %FTM 791.36032727 (19 to 30)
Shear Stability, Option B, Loss in KV at 40ºC, %ASTM D 260315 max15 max
Bulk Modulus, Isothermal Secant at 40ºC, 4,000 psig, psi200,000 min200,000 min
(1) Values not identified as min/max are typical and may vary within modest ranges

 Mobil Aero HF

Health and Safety

Based on available toxicological information, this product is not expected to produce adverse effects on health when used and handled properly. Information on use and handling, as well as health and safety information, can be found in the Material Safety Data Sheet (MSDS) which can be obtained from your local distributor or via the Internet on


The ExxonMobil logotype, Mobil and Aero HF are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.


Copyright © 2001-2014 Exxon Mobil Corporation. All rights reserved.


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