Mobilgrease 28 is a supreme performance, high temperature, antiwear grease
combining the unique features of a polyalphaolefin (PAO) synthetic base fluid
with an organo-clay (non-soap) thickener. The wax-free nature of the
synthetic base fluid, together with its low coefficient of traction compared
with mineral oils, provide excellent low temperature pumpability, very low
starting and running torque, and the potential to reduce operating
temperatures in the load zone of rolling element bearings. The clay thickener
provides excellent stability at high temperatures and Mobilgrease 28 has a
high dropping point value of 260ºC. In addition, it resists water washing,
provides superior load-carrying ability, reduces frictional drag, and prevents
excessive wear. Tests show that Mobilgrease 28 prevents friction oxidation
(fretting) and lubricates rolling element bearings under conditions of high
speeds and temperatures. It has also shown superior ability to lubricate
heavily loaded sliding mechanisms, such as wing flap screwjacks. Its
consistency is between an NLGI No. 1 and No. 2 grease.
Mobilgrease 28 meets the quality level of U.S. Military Specification MIL-G-81322E, General-Purpose, Aircraft, and is approved against U.S. Military Specification DOD-G-24508A (Navy) for shipboard auxiliary machinery. It can be designated U.S. Military Symbol WTR and NATO Symbol G-395.
Mobilgrease 28 has been widely used for military and related applications, worldwide, for more than 30 years. This leading product is based on the synthesized PAO base stocks that were pioneered by the RandD arm of our company resulting in step-out performance not only in grease but in many fluid lubricants, too.
Mobilgrease 28 is one of many Mobil branded PAO-based products recognized
around the world for innovation and outstanding performance. Synthetic
products like Mobilgrease 28 represent ExxonMobil's continuing commitment to
using advanced technology to provide outstanding products. Close contacts
between ExxonMobil scientists and application specialists and key equipment
builders ensure that our products meet the needs of the latest aviation
Good resistance to high temperature stresses and excellent starting and low torque at low-temperature are two of the most important requirements of aviation greases. To meet this combination of needs, our product formulation scientists chose proprietary synthetic base oils for Mobilgrease 28 because of their exeptional thermal/oxidative resistance potential, and superb low-temperature capability. Our formulators chose a specific thickener chemistry and a prorietary additive combination which would maximize the benefits of the synthetic base oils.
Mobilgrease 28 meets the requirements of key military and commercial aviation specifications and has built up an excellent reputation for performance and reliability among users around the world. Mobilgrease 28 provides the following advantages and potential benefits:
|Features||Advantages and Potential Benefits|
|High viscosity index base stock with no wax content||Very wide operating temperature range - outstanding high and low temperature performance|
|Excellent film protection at high temperatures|
|Minimum resistance to start-up at extremely low temperatures|
|Low traction base oil||Low sliding friction and reduced heat build-up|
|Potential for energy savings|
|Excellent protection against fretting wear and corrosion||Superb bearing protection and extended bearing life and reduced bearing replacement costs|
|Extreme-pressure characteristics||Avoids excessive wear, even under shock load|
|High thermal/oxidative stability||Extended relubrication intervals|
|High resistance to water washout||Maintains excellent grease performance in adverse weather and other water-exposure conditions|
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 -55º to 180ºC with
appropriate relubrication intervals.
Mobilgrease 28 meets the quality level of military specifications MIL-G-81322 for wide temperature range aviation service and is approved under DOD-G-24508A for shipboard service. Specific military and civil aviation applications include:
|Mobilgrease 28 meets or exceeds the following industry specification:|
|Quality Level USDA H-2||X|
|Mobilgrease 28 has the following builder approval:|
|DOD-G-24508 A Amendment 1||X|
|Mobilgrease 28 is recommended for use in applications requiring:|
|Approved against MIL|
|MIL-G-81322E quality level||X|
|Penetration, Worked, 25ºC, ASTM D 217||280|
|Dropping Point, ºC, ASTM D 2265||310|
|Viscosity of Oil, ASTM D 445|
|cSt @ 40ºC||29.3|
|Penetration, Worked, FTM 313, X100,000, 1/16�? holes, mm/10||320|
|Oil Separation, 30 hr. at 177ºC, ASTM D 6184, vol-%||2.5|
|Evaporation Loss, ASTM D 2595, 22 hrs @ 177ºC, vol-%||5.2|
|Copper Strip Corrosi0n, ASTM D 130, 24 hrs @ 100ºC||1B|
|4 Ball Wear, ASTM D 2266, Scar,mm||0.5|
|Load Carrying Capacity, ASTM D 2596, Load Wear Index, kgf||44|
Mobilgrease 28 is manufactured from high quality synthetic base oil, carefully
blended with selected soaps and additives. As with all petroleum products,
good personal hygiene and careful handling should always be practised. Avoid
prolonged contact to skin, splashing into the eyes, ingestion or vapour
inhalation. High-pressure injection of any grease under the skin can cause
serious delayed soft tissue damage and should be treated immediately by a
physician. To avoid injection injuries, inspect greasing equipment regularly
for worn hoses and fittings. Keep fingers away form the nozzle and ensure the
nozzle is firmly in place before discharging the grease. Please refer to our
Imperial Oil Material Safety Data Sheet for further information.
Note: This product is not controlled under Canadian WHMIS legislation.
The Mobil logotype, the Pegasus design and Mobilgrease are trademarks of Exxon Mobil Corporation, or one of its subsidiaries.
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