Mobilgrease 28

Standards & approvals

• NATO Code G-395

  NATO Code G-395 — aviation grease

  NATO code for an aviation grease.

• MIL-PRF-81322G

  MIL-PRF-81322G — aviation grease

  The US military specification for a wide-temperature-range aircraft grease.

• MIL-PRF-24508B

  MIL-PRF-24508B — aviation grease

  US military specification for a synthetic aircraft grease.

• MIL-G-7711A

  General-purpose mineral airframe grease (obsolete)

  Obsolete US military specification for a general-purpose mineral grease for aircraft bearings and gearboxes; superseded by MIL-PRF-24139.

Specifications

Brand

Mobil (ExxonMobil)

Range

Mobilgrease

Category

Aviation greases

Viscosity

NLGI 1.5

Manufacturer code

201550402020

Availability

On request

Typical characteristics

Manufacturer's description

Mobilgrease 28 is a supreme-performance, wide-temperature, anti-wear grease that combines a polyalphaolefin (PAO) synthetic base fluid with an organo-clay (non-soap) thickener, giving a consistency between NLGI No. 1 and No. 2. The wax-free synthetic base fluid and high viscosity index provide excellent low-temperature pumpability and very low starting/running torque, while the clay thickener gives a high dropping point of around 300°C for excellent high-temperature stability. The grease resists water washing, carries heavy loads, reduces frictional drag and prevents excessive wear. Designed for plain and rolling bearings at low to high speeds, and for splines, screws, worm gears and other high-friction mechanisms, it operates across -54°C to 177°C. It is recommended for 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, and — subject to manufacturer approval — for naval shipboard auxiliary machinery, plus general industrial lubrication wherever extreme temperatures, high speeds or water washout resistance are required. Mobilgrease 28 is qualified under U.S. Military Specification MIL-PRF-81322 (General-Purpose, Aircraft) and DOD-G-24508A (Navy, shipboard auxiliary machinery), carries NATO Code Number G-395, and for more than 30 years has been the multi-purpose grease of choice for military and related aviation applications worldwide.

Applications

• Mobilgrease 28 is designed for the lubrication of plain and rolling bearings at low to high speeds, and of splines, screws, worm gears and other mechanisms requiring high friction reduction, low wear and low lubricant friction losses.
• Recommended operating temperature range: −54 °C to 177 °C (−65 °F to 350 °F), with appropriate relubrication intervals.
• Recommended for 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 approval, it can also be used on naval shipboard auxiliary machinery and wherever the superseded specifications MIL-G-81322 (WP), MIL-G-7711A, MIL-G-3545B and MIL-G-25760A are called for.
• 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.
• Examples include conveyor bearings, small alternator bearings operating near 177 °C (350 °F), high-speed miniature ball bearings, and bearings subject to oscillating motion and vibration.
• 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 carries U.S. Military Symbol WTR and NATO Code Number G-395.

Performance & benefits

• ExxonMobil product formulation scientists chose synthetic hydrocarbon base oils for Mobilgrease 28, for their low volatility, exceptional thermal/oxidative resistance and superb low-temperature capability.
• It uses a specific thickener chemistry and a proprietary additive combination that maximises 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 worldwide.
• Excellent protection against wear and corrosion: superb bearing protection, helping extend bearing life and reduce bearing-replacement costs.
• Extreme-pressure protection: avoids excessive wear, even under shock load.
• High thermal/oxidative stability and high resistance to water washout: long relubrication intervals, maintaining excellent grease performance in adverse weather and other water-exposure conditions.