We use cookies to help personalise your web experience and improve our websites. To find out more about what cookies are, how we use them and how to delete them, see our Cookie Statement. By continuing to use this site, you are consenting to the use of cookies.

Close
8

Mobil Aero™ HF Series

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

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

This product is recommended for use in applications requiring:

HF

HFA

Mil-H-5606A

 

X

 

This product meets or exceeds the requirements of:

HF

HFA

MIL-PRF-5606J

X

 

NATO H-515

X

 

 

Properties and Specifications

Property

HF

HFA

API Gravity, °API, ASTM D287

29

30

Acid Number, mgKOH/g, ASTM D664

 

0.03 (0.2 max)

Barium, mg/kg, ASTM D5185

<1 (10 max)

 

Base Oil Specific Gravity 15.6 C/15.6 C, ASTM D287

0.872

 

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

200,000 min

200,000 min

Color, Visual

Red

Red

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

PASS

PASS

Density @ 60 F, lb/gal, CALCULATED

7.26

7.26

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

12 (20 max)

 

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

107

107 (93 min)

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

96 (82 min)

92

Foam, Sequence I, Stability, ml, ASTM D892

 

0

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)

1900

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

5.2 (4.9 min)

5.2

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

14.0 (13.2 min)

14.0

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

 

PASS

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

PASS

 

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 D1429

 

0.872

Viscosity Index, ASTM D2270

370

370

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) @ http://www.msds.exxonmobil.com/psims/psims.aspx

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

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
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)
API Gravity 30 29
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)
Specific Gravity, 60ºF/60ºF ASTM D 4052 0.872 0.872
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
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)
  • Business jet flying and using ExxonMobil Aviation lubricants

    Other aviation lubricants

    Our range of aviation lubricants includes piston, gear and specialty turbine oils, specifically formulated to provide outstanding performance for a wide array of applications.

    Learn More
  • Blue sky view from the side of a plane

    FAQs

    Find answers to general ExxonMobil aviation questions or explore our other FAQ pages about jet turbine oils, hydraulic fluids, piston engine oils, greases and gear oils.

    Learn more
  • Airplane utilizing full line of ExxonMobil Aviation fuels and lubricants

    Quick reference chart

    View our reference chart of ExxonMobil aviation fuels and lubricants.

    Learn More