Ratings

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.

 

Equipment lubricant recommendations

Our Mobil™ Product Selector tool will help you identify lubricant(s) for your specific equipment.

Data sheets

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

 

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

405

910

Low Temperature Torque, Starting, -29 C, g-cm, ASTM D1478

3630

5840

Lubrication Life @ 177 C, h, ASTM D3336

750+

750+

Oil Separation, 0.25 psi, 24 h @ 25 C, 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

 

Health and Safety

Health and Safety recommendations for this product can be found on the Material Safety Data Sheet (MSDS) @ http://www.msds.exxonmobil.com/psims/psims.aspx