PN: MOBIL28-4-4LB
Unit of Measure: EA
Hazmat/DG handling Fees May Apply
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DESCRIPTION | FEATURES | SPECIFICATIONS | DOCUMENTS | VIDEO | ASK A QUESTION
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. It offers outstanding performance over a wide temperature range. The wax-free nature of the synthetic base fluid, together with its high viscosity index compared to mineral oils, provide excellent low temperature pumpability, very low starting and running torque, and can help reduce operating temperatures in the load zone of rolling element bearings.
The clay thickener gives Mobilgrease 28 a high dropping point value of around 300ºC, which provides excellent stability at high temperatures. Mobilgrease 28 resists water washing, provides superior load-carrying ability, reduces frictional drag, and prevents excessive wear. Tests show that Mobilgrease 28 lubricates effectively rolling element bearings under conditions of high speeds and temperatures. Mobilgrease 28 has also shown excellent ability to lubricate heavily loaded sliding mechanisms, such as wing flap screw jacks.
For more than 30 years, Mobilgrease 28 has been the multi-purpose grease of choice for military and related aviation applications, worldwide.
Common grease point applications
A particular requirement of aviation greases is the need to resist high temperature stresses, while providing excellent starting and low torque at low-temperature. To meet this combination of needs ExxonMobil product formulation scientists chose synthetic hydrocarbon base oils for Mobilgrease 28 because of their low volatility, exceptional thermal/oxidative resistance, and superb low-temperature capability. Formulators chose specific thickener chemistry and a proprietary additive combination which helps maximize the benefits of the synthetic base oils.
Mobilgrease 28 meets the requirements of key military and commercial aviation specifications and has built up a superb reputation for performance and reliability among users around the world.
Mobilgrease 28 provides the following advantages and potential benefits:
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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 |
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This product has the following approvals: |
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NATO G-395 |
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MIL-PRF-81322G |
| MIL-PRF-24508B |
PROPERTIES & SPECIFICATIONS:
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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 |
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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 |
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