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Mobil Aero™ HF Series

View all Hydraulic fluids

Aircraft pumps and servo-valves

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.  

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

Reasons to trust Mobil Aero HF

  • A high viscosity index (VI), which allows equipment operation over a wide range of temperatures
  • Excellent low-temperature properties to provide high performance operation in low ambient conditions
  • Good chemical and oxidation stability to resist the formation of acidic constituents, varnishes and deposits
  • Meets "super clean" requirements of US Spec. MIL-PRF-5606 (Aero HF), ensuring reliable performance of pumps, servo-valves and other hydraulic system components
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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:
Features
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

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.


Specifications and approvals

Mobil Aero Grade
HFA
HF
MIL-H-5606A (obsolete) quality level X

MIL-PRF-5606 approved

X
NATO Code H-515

X

Typical properties

Mobil Aero Grade(1)
Test Method
HFA
HF
Color Visual Red Red
API Gravity

   30 29
Specific Gravity, 60ºF/60ºF ASTM D 4052 0.872 0.872
Density at 60ºF, lb/gal ASTM D 4052 7.26 7.26
Pour Point, ºC ASTM D 97 -64 (-60 max) -62 (-60 max)
Flash Point, COC, ºC ASTM D 92 107 (93 min) 107
Flash Point, PMCC, ºC ASTM D 93 92 96 (82 min)
Acid Number, mg KOH/g ASTM D 664 0.03 (0.2 max) 0.04 (0.2 max)
Barium Content, ppm ASTM D 5185 - ‹1 (10 max)
Kinematic Viscosity, cSt ASTM D 445

at 100ºC

5.2 5.2 (4.9 min)
at 40ºC

14 14.0 (13.2 min)
at -40ºC

450 (500 max) 450 (600 max)
at -54ºC

1900 2000 (2500 max)
at 130ºF

10.4 (10.0 min) -
Viscosity Index ASTM D 2270 370 370
Low Temperature Stability FTM 791.3459 Pass -
72 hours at -54ºC FTM 791.3458 - Pass
Copper Corrosion, 72 hours at 135ºC ASTM D 130 1b (2e max) 1b (2e max)
Oxidation Corrosion Stability, 168 hours at 135ºC ASTM D 4636 Pass Pass
Water Content, Karl Fischer, ppm ASTM D 6304 50 (100 max) 50 (100 max)
4-Ball Wear Scar, 1 hour, 1200 rpm, 75ºC, 40 kg, mm 0.6 (1.0 max) 0.6 (1.0 max) 7 max
Evaporation Loss, wt % ASTM D 972

6 hours at 71ºC

- 12 (20 max)
Particle Count Auto 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 mL ASTM D 4898

0.2 (0.3 max)

Foam, Seq I, mL/mL ASTM D 892 36/3 (65/0 max) 37/2 (65/0 max)
Nitrile Rubber L Swell, 168 hours at 70ºC, % FTM 791.3603 27 27 (19 to 30)
Shear Stability, Option B, Loss in KV at 40ºC, % ASTM D 2603 15 max 15 max
Bulk Modulus, Isothermal Secant at 40ºC, 4,000 psig, psi

200,000 min 200,000 min
(1) Values not identified as min/max are typical and may vary within modest ranges

  • High/Low temperature viscosity
  • Extended temperature range
  • Oxidation stability
  • Deposit control
  • Anti-wear protection
  • Superior cleanliness
  • MIL-H-5606A
  • MIL-PRF-5606
  • NATO Code H-515

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