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    Mobilgrease 28

    Synthetic Aviation Grease

    Product Description

    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.

     

    Features and Benefits

    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:


    FeaturesAdvantages and Potential Benefits
    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
    Excellent protection against wear and corrosion
    Superb bearing protection and helps extend bearing life and reduce bearing replacement costs
    Extreme-pressure protection characteristics
    Avoids excessive wear, even under shock load
    High thermal/oxidative stability
    Long relubrication intervals
    High resistance to water washout
    Maintains excellent grease performance in adverse weather and other water-exposure conditions


     

    Applications

    Mobilgrease 28 is 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 also 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 qualified by the U.S. Military under Specification MIL-PRF-81322, General-Purpose, Aircraft, and Specification DOD-G-24508A (Navy) for shipboard auxiliary machinery. It is a U.S. Military Symbol WTR and NATO Code Number G-395 grease.

     

    Specifications and Approvals

     


    Mobilgrease 28Is Approved AgainstQuality Level
    MIL-PRF-81322G
                   X


    DOD-G-24508A, Amendment 4

             X

    NATO G-395
                   X



     

     

    Typical Properties

     Test MethodsMobilgrease 28 Typicals (1)MIL-PRF-81322 Limits
    NLGI Grade

    1 1/2

    Thickener Type

    Clay (non-soap)

    Color
    Visual
    Dark Red

    Structure
    Visual
    Smooth, buttery

    Dropping Point, ºC (ºF)
    ASTM D 2265
    307 (584)
    232 (450) min
    Viscosity of Base Oil, cSt
    ASTM D 445


    at 40ºC

    30

    at 100ºC

    5.7

    Low Temp. Torque at -54ºC (-65ºF), Nm (g-cm)
    ASTM D 1478


    Starting

    0.43(4400)
    0.98 (10,000) max
    Running, after 1 Hr

    0.05 (510)
    0.098 (1,000) max
    Penetration @ 25ºC (77ºF), 60 Stoke Worked, mm/10
    ASTM D 217
    293
    265-320
    Extended Worked Penetration Stability, 100,000 Strokes, mm/10
    FTM 313
    303
    350 max
    Oil Separation, 30 Hrs at 177ºC, wt %
    ASTM D 6184
    3.5
    2.0 - 8.0
    Evaporation Loss, 22 Hrs at 177ºC, wt %
    ASTM D 2595
    6
    10 max
    Copper Strip Corrosion, 24 Hrs at 100ºC
    ASTM D 4048
    1b
    1b max
    Four-Ball Wear, Scar dia, mm
    ASTM D 2266
    0.6
    0.8 max
    Load Wear Index, kgf
    ASTM D 2596
    40
    30 min
    Rust Protection, 48 Hrs at 125ºF, › 1mm dia Corrosion Spots
    ASTM D 1743
    Pass
    0
    Water Washout, 1 Hr at 41ºC, wt %
    ASTM D 1264
    1
    20 max
    High Temperature Performance, Hrs at 177ºC
    ASTM D 3336 (modified)
    Pass
    400 min
    Oxidation Stability, pressure drop in kPa
    ASTM D 942


    100 Hrs at 99ºC

    Pass
    83 max
    500 Hrs at 99ºC

    Pass
    172 max
    Dirt Count, Particles/mL
    FTM 3005


    25-74 Micron

    Pass
    1000 max
    75 Micron or Larger

    0
    0
    Oscillation Friction and Wear, Scar Dia, 35,000 cycles, 90º Angle, Aluminum Bronze Block, mm
    Modified ASTM D 3704
    Pass
    6.35 max
    Rubber Swell, L Type Synthetic, 1 week at 70ºC (158ºF), vol %
    FTM 3603
    6
    10 max
    (1) Typical properties are typical of those obtained with normal production tolerance and may vary slightly, while remaining within specified limits.



     

    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.

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