Mobil Polyrex EM grease is designed for electric motor bearings. Specially formulated to improve bearing performance and protection for long electric motor life, this grease is recommended by many major bearing and electric motor manufacturers for long-life lubrication of electric motor ball bearings and roller bearings. This grease provides high-temperature lubrication, advanced polyurea thickener, increased durability, and low bearing noise properties. Mobil Polyrex EM greases have been shown to be compatible with a number of ExxonMobil lithium complex greases, as well as competitive electric motor mineral polyurea products, as determined by the methodology of ASTM D6185.
| Features | Advantages and Potential Benefits |
|---|---|
| Outstanding grease life | Outstanding long-life, high-temperature lubrication of ball and roller bearings, particularly in sealed-for-life applications |
| Advanced polyurea thickener | Increased durability versus conventional polyurea greases when subjected to mechanical shear forces |
| Excellent corrosion resistance | Mobil Polyrex EM and Mobil Polyrex EM 103 provide protection against rust and corrosion. Mobil Polyrex EM provides additional protection under mild salt-water wash conditions versus Polyrex EM 103 |
| Low-noise properties | Mobil Polyrex EM is suitable for lubrication of ball bearings in many noise-sensitive applications |
Typical Properties
| Mobil Polyrex EM | Mobil Polyrex EM 103 | |
|---|---|---|
| NLGI Grade | 2 | 3 |
| Color | Blue | Blue |
| Base Oil Viscosity, ASTM D 445 | ||
| cSt @ 40°C | 115 | 115 |
| cSt @ 100°C | 12.2 | 12.2 |
| Viscosity Index, ASTM D 2270 | 95 | 95 |
| Penetration, ASTM D217 worked, 60x, mm/10 | 285 | 250 |
| Penetration Change after 100.000 strokes, ASTM D217, mm/10 | 40 | 40 |
| Dropping Point, ASTM D 2265, °C (°F) | 260 | 270 |
| Oil separation test, ASTM D 1742, % | 0.5 | 0.1 |
| High Temperature Grease Life, ASTM D 3336, Hours @ 177°C | 750+ | 750+ |
| 4-Ball Wear Scar, ASTM D 2266, @ 40kg, 1200 rpm, 75°C, 1 hr, mm | 0.41 | 0.6 |
| Low Temperature Torque, ASTM D 1478, g-cm @ -29°C | ||
| Starting | 7500 | 9300 |
| Running | 800 | 1000 |
| EMCOR Corrosion Performance, 10% Synthetic Sea Water ASTM D 6138 (Prepared As Per ASTM D 665B) | 0,1 (No Rust) | |
| Rust Protection, ASTM D 1743, Distilled Water | Pass | Pass |
| Copper Corrosion Resistance, ASTM D 4048 | 1A | 1A |
| Water Washout, ASTM D 1264, % | 1.9 | 0.8 |
