Mobil Aero HF Series

Aviation Hydraulic Fluids

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.

 

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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

This product is recommended by ExxonMobil 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

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