Applications
Mobil Polyrex EM greases are recommended by many major bearing and electric motor manufacturers for long-life lubrication of electric motor ball and roller bearings.
Mobil Polyrex EM 103 is more specifically recommended for applications such as vertically mounted bearings, or very large motors where a stiffer grease consistency may be required by the OEM.
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. For specific questions about grease compatibility, contact your Mobil representative.
Key applications include:
• Electric motor bearings
• Fin fan bearings
• High-temperature pump bearings
• Factory-filled, sealed-for-life ball bearings
• Ball or roller bearings operating at high temperatures where low oil separation is required
• Mobil Polyrex EM for ball or roller bearings operating in noise sensitive environments
Specifications and Approvals
| This product meets or exceeds the requirements of: | MOBIL POLYREX EM |
| DIN 51825:2004-06 – K 2 P -20 | X |
Properties and Specifications
| Property | MOBIL POLYREX EM | MOBIL POLYREX EM 103 |
| Grade | NLGI 2 | NLGI 3 |
| Thickener Type | Polyurea | Polyurea |
| Color, Visual | Blue | Blue |
| Copper Strip Corrosion, 24 h, 100 C, Rating, ASTM D4048 | 1A | 1A |
| Corrosion Preventive Properties, Rating, ASTM D1743 | PASS | PASS |
| Dropping Point, °C, ASTM D2265 | 260 | 270 |
| Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266 | 0.41 | 0.6 |
| Low Temperature Torque, Running, -29 C, g-cm, ASTM D1478 | 800 | 1000 |
| Low Temperature Torque, Starting, -29 C, g-cm, ASTM D1478 | 7500 | 9300 |
| Lubrication Life @ 177 C, h, ASTM D3336 | 750+ | 750+ |
| Oil Separation, mass%, ASTM D1742 | 0.5 | 0.1 |
| Penetration, 60X, 0.1 mm, ASTM D217 | 285 | 250 |
| Penetration, Change from 60X to 100,000X, 0.1 mm, ASTM D217 | 40 | 40 |
| SKF Emcor Rust Test, 10% Synthetic Sea Water, ASTM D6138 | 0.1 | |
| Viscosity @ 100 C, Base Oil, mm2/s, ASTM D445 | 12.2 | 12.2 |
| Viscosity @ 40 C, Base Oil, mm2/s, ASTM D445 | 115 | 115 |
| Viscosity Index, ASTM D2270 | 95 | 95 |
| Water Washout, Loss @ 79 C, wt%, ASTM D1264 | 1.9 | 0.8 |
