Mobil Aero HFA (5 Gal. Pail)
Mobil Aero HFA is a hydrocarbon-based aviation hydraulic fluid designed for commercial and military aircraft systems. It carries MIL-H-5606A (obselete) quality level approval. This exceptional fluid has superb low temperature properties, good anti-wear performance, and good chemical stability. It is made from mineral base oil stock and contains shear-stable VI (viscosity index) improvers, making it a low viscosity product with a high VI.
While this fluid is no longer used by the U.S. Military, it is still used in some older, small private and commercial aircraft, as well as industrial and commercial equipment requiring good fluidity at very low temperatures.
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 |
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.
| Mobil Aero Grade | HFA | HF |
| MIL-H-5606A (obsolete) quality level | X | |
| MIL-PRF-5606 approved | X | |
| NATO Code H-515 | X |
| 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 | ASTM D 4172 | 0.6 (1.0 max) | 0.6 (1.0 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 |
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