On order
Mobilgrease 33
General-purpose synthetic lithium complex aviation grease, −73 to +121 °C
NLGI 1.5
Specifications
- Brand
- Mobil (ExxonMobil)
- Category
- Aviation greases
- Viscosity
- NLGI 1.5
- Manufacturer code
- 201550402020
- Availability
- On order
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 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.
Performance & benefits
- Excellent protection against wear and corrosionSuperb bearing protection and helps extend bearing life and reduce bearing replacement costs
- Extreme-pressure protection characteristicsAvoids excessive wear, even under shock load
- High thermal/oxidative stability High resistance to water washoutLong relubrication intervals Maintains excellent grease performance in adverse weather and other water-exposure conditions
Standards & approvals
Approved for
Typical characteristics
| Property | Typical value | Method |
|---|---|---|
| Base oil viscosity of Greases @ 100 Cmm2/s | 5.7 | AMS 1700 |
| Base oil viscosity of Greases @ 40 Cmm2/s | 29.3 | AMS 1697 |
| Bomb Oxidation, Pressure Drop, 100 h, kPa | PASS | ASTM D942 |
| Colour | Dark Red | Visual |
| Copper strip corrosion, 24 h, 100 CRating | 1B | ASTM D4048 |
| Dirt, # particles 25u to 74 u | Pass | FTM 3005 |
| Dirt, # particles 75u or larger | 0 | FTM 3005 |
| Dropping point°C | 307 | ASTM D2265 |
| Evaporation loss, 22 h, 177 C, mass% | 6 | ASTM D2595 |
| Falex Block on Ring Oscillating Wear Scar, 35k cycles, 90 deg angle, Al/bronze | block, mm, ASTM D3704 PASS | |
| Four-Ball Wear Test, Scar Diametermm | 0.6 | ASTM D2266 |
| Load carrying capacity, Load-Wear Indexkgf | 40 | ASTM D2596 |
| Low Temperature Torque, Running @ -54 C, 60 min, Nm | 0.05 | ASTM D1478 |
| Low Temperature Torque, Starting @ -54 C, Nm | 0.43 | ASTM D1478 |
| Lubrication life @ 177 Ch | PASS | ASTM D3336 |
| NBR-L, AMS 3217/2 Compat, 70C 158 h, vol % | 6 | FTM 3603 |
| Oil separation, 30 h @ 177 C, mass% | 3.5 | ASTM D6184 |
| Oxidation stability, Pressure Drop, 500 h, kPa | PASS | ASTM D942 |
| Pen worked X 100, 000, 1/16" holes, 0.1 mm | 303 | FTM 313 |
| Penetration, worked, 60X, 0.1 mm | 293 | ASTM D217 |
| Rust Protection, 48 h @ 125 FRating | PASS | ASTM D1743 |
| Texture | Smooth, buttery | VISUAL |
| Thickenerwt% | Clay | AMS 1698 |
| Water Washout, Loss @ 41 Cwt% | 1 | ASTM D1264(mod) |
Complete documentation
We email you the sheets listed below in a single archive. No account, no order required.
- SDS
- SDS
- TDS