Product Description
Mobil Aero HFA, HF, and HFS 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 HFS is a synthetic polyalphaolefin-based
fluid.
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
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Advantages and Potential Benefits
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High Viscosity Index (VI)
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Allows equipment operation over a wide range of temperatures
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Excellent low temperature properties
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Provides high performance operation in low ambient conditions
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Good chemical and oxidation stability
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Resists the formation of acidic constituents, varnishes, and deposits
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Meets "super clean" requirements of U.S. Spec. Mil-PRF-5606 (Aero HF) or
MIL-PRF-83282 (Aero HFS)
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Ensures reliable performance of pumps, servo-valves and other hydraulic system
components
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Applications
Mobil Aero HFA is a premium quality fluid that meets the 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.
Mobil Aero HFS is a synthetic polyalphaolefin lubricant that is approved
against the most current version of U.S. Military specification MIL-PRF-83282.
It does not contain a viscosity index (VI) improver. It is designed for use at
temperatures down to -40ºC (-40ºF). It provides lower flammability and
volatility and improved stability, but has a higher viscosity at low
temperature then Mobil Aero HF. It meets the "super-clean" requirements. It is
intended primarily for U.S. military aircraft.It is a NATO Code Number H-537
fluid.
Specifications and Approvals
Mobil Aero Grade
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HFA
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HF
|
HFS
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| MIL-H-5606A (obsolete) quality level | X | | |
| MIL-PRF-5606 approved | | X | |
| MIL-PRF-83282 approved | | | X |
| NATO Code H-515 | | X | |
| NATO Code H-537 | | | X |
Typical Properties
Mobil Aero Grade(1)
|
Test Method
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HFA
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HF
|
HFS
|
| Color | Visual | Red | Red | Red |
| API Gravity | | 29 | 28.5 | 34.8 |
| Specific Gravity, 60ºF/60ºF | ASTM D 4052 | 0.882 | 0.881 | 0.851 |
| Pour Point, ºC | ASTM D 97 | -66 (-60 max) | -66 (-60 max) | -60 (-55 max) |
| Flash Point, COC, ºC | ASTM D 92 | 108 (93 min) | - | 224 (205 min) |
| Flash Point, PMCC, ºC | ASTM D 93 | - | 90 (82 min) | - |
| Acid Number, mg KOH/g | ASTM D 664 | 0.04 (0.2 max) | 0.03 (0.2 max) | 0.03 (0.2 max) |
| Barium Content, ppm | ASTM D 5185 | - | 1 (10 max)(2) | 1 (10 max) |
| Kinematic Viscosity, cSt | ASTM D 445 | | | |
| at 205ºC | | - | - | 1.1 (1.0 min) |
| at 100ºC | | 5.1 | 5.1 (4.9 min) | 3.5 (3.45 min) |
| at 40ºC | | 13.9 | 13.8 (13.2 min) | 14.2 (14.0 min) |
| at -40ºC | | 450 (500 max) | 450 (600 max) | 2000 (2200 max) |
| at -54ºC | | 1950 | 1950 (2500 max) | - |
| at 130ºF | | 10.4 (10.0 min) | - | - |
| Viscosity Index | ASTM D 2270 | 370 | 370 | 128 |
| Low Temperature Stability | FTM 791.3458 | | | |
| 72 hours at -54ºC | | Pass | Pass | - |
| 72 hours at -40ºC | | - | - | Pass |
| Copper Corrosion, 72 hours at 135ºC | ASTM D 130 | 2e max | 2e max | - |
| Oxidation Corrosion Stability, 168 hours at 135ºC | ASTM D 4636 | Pass | Pass | Pass |
| Water Content, Karl Fischer, ppm | ASTM D 6304 | 40 (100 max) | 40 (100 max) | 70 (100 max) |
| 4-Ball Wear Scar, 1 hour, 1200 rpm, 75ºC, 40 kg, mm | ASTM D 4172 | 0.8 (1.0 max) | 0.8 (1.0 max) | 0.53 (0.65 max) |
| Evaporation Loss, wt % | ASTM D 972 | | | |
| 6 hours at 71ºC | | 15 (20 max) | 15 (20 max) | - |
| 6.5 hours at 205ºC | | - | - | 11 (20 max) |
| Particle Count | Auto Counter | | | |
| 5-15 microns | | | 10000 max | 10000 max |
| 15-25 microns | | | 1000 max | 1000 max |
| 25-50 microns | | | 150 max | 150 max |
| 50-100 microns | | | 20 max | 20 max |
| 100+ microns | | | 5 max | 5 max |
| Particulate Contamination, mg/100 mL | ASTM D 4898 | | 0.1 (0.3 max) | 0.2 (0.3 max) |
| Filtration Time, minutes/100 mL | FTM 791.3009 | | 3 (15 max) | 4 (15 max) |
| Foam, Seq I, mL/mL | ASTM D 892 | 30/0 (65/0 max) | 30/0 (65/0 max) | 10/0 (65/0 max) |
| Nitrile Rubber L Swell, 168 hours at 70ºC, % | FTM 791.3603 | 19.0 to 30.0 | 19.0 to 30.0 | 18.0 to 30.0 |
| 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 | - |
| Bulk Modulus, Isothermal Secant at 40 ºC, 10,000 psig, psi | | - | - | 200,000 min |
| (1) Values not identified as min/max are typical and may vary within modest ranges | | | | |
| (2) Applies to product approved against MIL-PRF-5606H | | | | |
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 http://www.exxonmobil.com/lubes
The ExxonMobil logotype, Mobil and Aero HF are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.
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