Mobil Polyrex EM

Mobil Polyrex EM

Product Description

Super-premium Mobil Polyrex™ EM Series greases are specially formulated for electric-motor bearings. The advanced thickener formulation and proprietary manufacturing techniques provide improved bearing performance and protection for long electric motor life.

Features and Benefits

Mobil Polyrex EM and Mobil Polyrex EM 103 offer the following features and benefits:

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

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

Mobil Polyrex EMmeets or exceeds the requirements of: Mobil Polyrex EM Mobil Polyrex EM 103
DIN 51825: (2004-06) K2P-20

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

Health and Safety

Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and when the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment.

Remark

It cannot be guaranteed that the product information given above is up to date. For the latest version of the Product Data Sheet we refer to the product library of ExxonMobil.