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 260ēC. . 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 the
company resulting in step-out performance not only in grease but in many
fluid lubricants, too.
Features
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 the products meet the needs of the latest aviation equipment designs.
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 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:
Benefits
Landing wheel assemblies
Control systems, screwjacks, servo devices, actuators, sealed-bearing motors and oscillating bearings
Helicopter rotor bearings on aircraft and on naval shipboard auxiliary machinery
It also can be used where superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B, and MIL-G-25760A may be called for
Mobilgrease 28 also 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 177° C
High-speed miniature ball bearings, and bearing situations where oscillatory motion, vibration, and fretting create problems
Engine Parts - Grease
