Mobil Polyrex™ EM

Electric Motor Bearing Grease

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

Typical Properties of Mobil Polyrex EM
NLGI Grade	2
Color	Blue
Base Oil Viscosity, ASTM D 445
cSt @ 40°C	115
cSt @ 100°C	12.2
Viscosity Index, ASTM D 2270	95
Penetration, ASTM D217 worked, 60x, mm/10	285
Penetration Change after 100.000 strokes, ASTM D217, mm/10	40
Dropping Point, ASTM D 2265, °C (°F)	260
Oil separation test, ASTM D 1742, %	0.5
High Temperature Grease Life, ASTM D 3336, Hours @ 177°C	750+
4-Ball Wear Scar, ASTM D 2266, @ 40kg, 1200 rpm, 75°C, 1 hr, mm	0.41
Low Temperature Torque, ASTM D 1478, g-cm @ -29°C
Starting	7500
Running	800
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
Copper Corrosion Resistance, ASTM D 4048	1A
Water Washout, ASTM D 1264, %	1.9