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Mobilgrease 28 is recommended for industrial lubrication, including sealed or repackable ball and roller bearings wherever extreme temperature conditions, high speeds, or water washing resistance are factors. Typical industrial applications include conveyor bearings, small alternator bearings operating at temperatures near 177ºC (350ºF), high-speed miniature ball bearings, and bearing applications where oscillatory motion, and vibration create problems.
Mobilgrease 28 is also designed for the lubrication of plain and rolling bearings at low to high speeds, and splines, screws, worm gears, and other mechanisms where high friction reduction, low wear, and low lubricant friction losses are required. The recommended operating temperature range is -54ºC to 177ºC (-65ºF to 350ºF) with appropriate relubrication intervals.
Mobilgrease 28 is recommended for use in landing wheel assemblies, control systems and actuators, screw jacks, servo devices, sealed-bearing motors, oscillating bearings, and helicopter rotor bearings on military and civil aircraft. Subject to equipment manufacturer approvals, it can also be used on naval shipboard auxiliary machinery and where superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B, and MIL-G-25760A are recommended.
Mobilgrease 28 is a supreme-performance, wide-temperature, antiwear grease designed to combine the unique features of a polyalphaolefin (PAO) synthetic base fluid with an organo-clay (non-soap) thickener. Its consistency is between an NLGI No. 1 and No. 2 grease.
The formulation of Mobilgrease 28 aviation grease helps it:
• Has a 10-year shelf life
• Meet the performance requirements of key military and commercial aviation specifications
• Resist high-temperature stresses while providing excellent starting and low torque at low temperature
• Provide outstanding protection against wear and corrosion, helping to extend bearing life, reduce bearing replacement costs and lengthen relubrication intervals
• Perform at operating temperatures as high as 350ºF (177ºC) and as low as -65ºF (-54ºC), with appropriate relubrication intervals
• Deliver excellent protection in adverse weather and other water-exposure conditions
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Features |
Advantages and Potential Benefits |
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High viscosity index (VI) synthetic base stock with no wax content |
Allows wide operating temperature range - outstanding high and low temperature performance Provides thicker fluid films protecting against wear of equipment parts operating at high temperature Causes low resistance during start-up at very low temperatures |
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Excellent protection against wear and corrosion |
Superb bearing protection and helps extend bearing life and reduce bearing replacement costs |
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Extreme-pressure protection characteristics |
Avoids excessive wear, even under shock load |
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High thermal/oxidative stability |
Long relubrication intervals |
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High resistance to water washout |
Maintains excellent grease performance in adverse weather and other water-exposure conditions |
Technical Data
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Property |
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Grade |
NLGI 1.5 |
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Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700 |
5.7 |
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Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697 |
29.3 |
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Bomb Oxidation, Pressure Drop, 100 h, kPa, ASTM D942 |
PASS |
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Color, Visual |
Dark Red |
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Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048 |
1B |
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Dirt, # particles 25u to 74 u, FTM 3005 |
Pass |
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Dirt, # particles 75u or larger, FTM 3005 |
0 |
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Dropping Point, °C, ASTM D2265 |
307 |
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Evaporation Loss, 22 h, 177 C, mass%, ASTM D2595 |
6 |
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Falex Block on Ring Oscillating Wear Scar, 35k cycles, 90 deg angle, Al/bronze block, mm, ASTM D3704 |
PASS |
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Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266 |
0.6 |
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Load Carrying Capacity, Load-Wear Index, kgf, ASTM D2596 |
40 |
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Low Temperature Torque, Running @ -54 C, 60 min, Nm, ASTM D1478 |
0.05 |
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Low Temperature Torque, Starting @ -54 C, Nm, ASTM D1478 |
0.43 |
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Lubrication Life @ 177 C, h, ASTM D3336 |
PASS |
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NBR-L, AMS 3217/2 Compat, 70C 158 h, vol %, FTM 3603 |
6 |
|
Oil Separation, 30 h @ 177 C, mass%, ASTM D6184 |
3.5 |
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Oxidation Stability, Pressure Drop, 500 h, kPa, ASTM D942 |
PASS |
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Pen Worked X 100,000, 1/16" holes, 0.1 mm, FTM 313 |
303 |
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Penetration, Worked, 60X, 0.1 mm, ASTM D217 |
293 |
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Rust Protection, 48 h @ 125 F, Rating, ASTM D1743 |
PASS |
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Texture, VISUAL |
Smooth, buttery |
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Thickener, wt%, AMS 1698 |
Clay |
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Water Washout, Loss @ 41 C, wt%, ASTM D1264(mod) |
1 |
Data Sheets
