Our 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.

Mobil Polyrex EM electric motor bearing grease provides:

  • Outstanding long-life, high-temperature lubrication
  • Increased durability compared to conventional greases
  • Protection against rust and corrosion
  • Low noise properties

 


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Technical resources

How to choose grease for electric motor bearings | Mobil™

Grease is frequently used to lubricate electric motor bearings because of its simplicity of application and unique characteristics. Read about what you should consider when choosing the proper grease.

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Electric motor bearing lubrication guide | Mobil™

This technical topic serves as a practical guide to the proper lubrication of electric motor bearings utilizing industrial grease as a lubricant.

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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

Base Oil Viscosity of Greases @ 100 C, mm2/s, AMS 1700

12.2

12.2

Base Oil Viscosity of Greases @ 40 C, mm2/s, AMS 1697

115

115

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

 

0.6

Four-Ball Wear Test, Scar Diameter, 40 kg, 1200 rpm, 1 h, 75 C, mm, ASTM D2266

0.41

 

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, ASTM D6138

0,1 (No Rust)

 

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