Mobilgrease 28 Synthetic aviation grease MIL-PRF-81322G 16 kg bucket

Synthetic Aviation Grease, MIL-PRF-81322G approved | Exxonmobil Mobilgrease 28

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. 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.

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• Subject to equipment manufacturer approvals, it can also be used on naval shipboard auxiliary machinery and where superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B, and MIL-G-25760A are recommended.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.

Specifications and Approvals

This product has the following approvals:

• NATO G-395
• MIL-PRF-81322G (Military)
• MIL-PRF-24508B
• DOD-G-24508A (Navy)

Benefits

• 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
• Superb bearing protection and helps extend bearing life and reduce bearing replacement costs
• Avoids excessive wear, even under shock load
• Long relubrication intervals
• Maintains excellent grease performance in adverse weather and other water-exposureconditions

Features

• High viscosity index (VI) synthetic base stock with no wax content
• Excellent protection against wear and corrosion
• Extreme-pressure protection characteristics
• High thermal/oxidative stability
• High resistance to water washout
• Volume: 16kg bucket
• Also available as: 400g cartridge, 2kg can

Technical specifications

Grade	NLGI 1.5
Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700	5.7
Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697	29.3
Bomb Oxidation, Pressure Drop, 100 h, kPa, ASTM D942	PASS
Color, Visual	Dark Red
Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048	1B
Dirt, # particles 25u to 74 u, FTM 3005	Pass
Dirt, # particles 75u or larger, FTM 3005	0
Dropping Point, °C, ASTM D2265	307
Evaporation Loss, 22 h, 177 C, mass%, ASTM D2595	6
Falex Block on Ring Oscillating Wear Scar, 35k cycles, 90 deg angle, Al/bronze block, mm, ASTM D3704	PASS
Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266	0.6
Load Carrying Capacity, Load-Wear Index, kgf, ASTM D2596	40
Low Temperature Torque, Running @ -54 C, 60 min, Nm, ASTM D1478	0.05
Low Temperature Torque, Starting @ -54 C, Nm, ASTM D1478	0.43
Lubrication Life @ 177 C, h, ASTM D3336	PASS
NBR-L, AMS 3217/2 Compat, 70C 158 h, vol %, FTM 3603	6
Oil Separation, 30 h @ 177 C, mass%, ASTM D6184	3.5
Oxidation Stability, Pressure Drop, 500 h, kPa, ASTM D942	PASS
Pen Worked X 100,000, 1/16" holes, 0.1 mm, FTM 313	303
Penetration, Worked, 60X, 0.1 mm, ASTM D217	293
Rust Protection, 48 h @ 125 F, Rating, ASTM D1743	PASS
Texture, VISUAL	Smooth, buttery
Thickener, wt%, AMS 1698	Clay
Water Washout, Loss @ 41 C, wt%, ASTM D1264(mod)	1