Description

Mobilgrease 28 MIL-PRF-81322 Synthetic Aircraft Grease 4.4 lb / 2Kg Can

Mobilgrease 28 is a supreme performance, wide-temperature, anti-wear 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.

To learn more, download the mobilgrease 28 factsheet >>

Features & Benefits of Mobilgrease 28 MIL-PRF-81322

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.

Advantages and potential benefits of Mobilgrease 28 MIL-PRF-81322 Synthetic Grease

Features	Advantages 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 of Mobilgrease 28 MIL-PRF-81322 Synthetic Grease

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 of Mobilgrease 28 MIL-PRF-81322 Synthetic Grease

Mobilgrease 28	Is Approved Against	Quality Level
MIL-PRF-81322G	X
DOD-G-24508A, Amendment 4		X
NATO G-395	X

Technical Details of Mobilgrease 28 MIL-PRF-81322 Synthetic Grease

Typical Properties  Test Methods Mobilgrease 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 6 (1) Typical properties are typical of those obtained with normal production tolerance and may vary slightly, while remaining within specified limits.

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