Mobil Aero™ HF Series

Mobil Aero HF Series

 

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.

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 levelX 
MIL-PRF-5606 approved X
NATO Code H-515 X

Typical Properties

 

Mobil Aero Grade(1)Test MethodHFAHF
ColorVisualRedRed
API Gravity 3029
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 100ºC 5.25.2 (4.9 min)
at 40ºC 1414.0 (13.2 min)
at -40ºC 450 (500 max)450 (600 max)
at -54ºC 19002000 (2500 max)
at 130ºF 10.4 (10.0 min) -
Viscosity IndexASTM D 2270370370
Low Temperature StabilityFTM 791.3459Pass  -
72 hours at -54ºCFTM 791.3458 -Pass
Copper Corrosion, 72 hours at 135ºCASTM D 1301b (2e max)1b (2e max)
Oxidation Corrosion Stability, 168 hours at 135ºCASTM D 4636 Pass Pass 
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 71ºC  -12 (20 max)
Particle CountAuto Counter  
5-15 microns  1000 (10000 max)
15-25 microns  100 (1000 max)
25-50 microns  30 (150 max)
50-100 microns  5 (20 max)
100+ microns  0 (5 max)
Particulate Contamination, mg/100 mLASTM D 4898 0.2 (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, psi 200,000 min200,000 min

 

(1) Values not identified as min/max are typical and may vary within modest ranges

 
Features & 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
Applications

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.

Specs

Specifications and Approvals

 

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

Typical Properties

 

Mobil Aero Grade(1)Test MethodHFAHF
ColorVisualRedRed
API Gravity 3029
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 100ºC 5.25.2 (4.9 min)
at 40ºC 1414.0 (13.2 min)
at -40ºC 450 (500 max)450 (600 max)
at -54ºC 19002000 (2500 max)
at 130ºF 10.4 (10.0 min) -
Viscosity IndexASTM D 2270370370
Low Temperature StabilityFTM 791.3459Pass  -
72 hours at -54ºCFTM 791.3458 -Pass
Copper Corrosion, 72 hours at 135ºCASTM D 1301b (2e max)1b (2e max)
Oxidation Corrosion Stability, 168 hours at 135ºCASTM D 4636 Pass Pass 
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 71ºC  -12 (20 max)
Particle CountAuto Counter  
5-15 microns  1000 (10000 max)
15-25 microns  100 (1000 max)
25-50 microns  30 (150 max)
50-100 microns  5 (20 max)
100+ microns  0 (5 max)
Particulate Contamination, mg/100 mLASTM D 4898 0.2 (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, psi 200,000 min200,000 min

 

(1) Values not identified as min/max are typical and may vary within modest ranges

FAQs
Frequently asked questions about aviation products
Find answers to the most commonly asked questions about ExxonMobil Aviation products and services.
Where to buy tool
Aviation where to buy tool for lubricants and fuels
Learn more about where to buy ExxonMobil Aviation fuels and lubricants.
Tech topics
Jet engine
Gain the best understanding of our products and the applications they support.