Mobil Polyrex 461 EP

Mobil industrial , United States

Multi-purpose Grease

Product Description

Mobil Polyrex™ 461 EP is a shear-stable polyurea grease with excellent extreme-pressure (EP) and load-carrying characteristics. The proprietary polyurea thickener system exhibits excellent resistance to oxidation and oil separation at operating temperatures as high as 160°C (320°F). With its outstanding high-temperature oxidation stability, load-carrying capability, shear stability, water resistance and wide operating temperature range, Mobil Polyrex 461 EP is an excellent heavy-duty grease for a wide array of industrial and construction applications.

 

Features and Benefits

EXTREME-PRESSURE PROTECTION AND THERMAL STABILITY

Mobil Polyrex 461 EP contains a proprietary extreme-pressure (EP) additive package that provides load-carrying capability without degrading the thermal stability of the grease at high temperatures. Conventional sulfur- and phosphorus-base EP additives used in other multi-purpose greases begin to oxidize rapidly at temperatures above 250°F.Mobil Polyrex 461 EP, on the other hand, continues to provide a high level of wear and extreme-pressure protection up to 160°C (320°F) without rapid oxidation of the anti-wear or EP additives.

 

SUPERB SHEAR STABILITY

The proprietary polyurea thickener system inMobil Polyrex 461 EP exhibits excellent durability and stability when subjected to a mechanical shearing force. For example, in the ASTM D 217 cone penetration test, the consistency of Mobil Polyrex 461 EP changed by approximately one NLGI grade after being worked for 100,000 strokes - similar to the performance of high-quality lithium-complex greases, which are the benchmark for excellent shear stability. By contrast, competitive polyurea greases containing shear-unstable thickener technology can soften by three NLGI grades under the same test conditions. Good mechanical shear stability is important in roller bearing applications where excessive grease softening may lead to grease leakage or purging from the bearing.

 

EXCELLENT WATER RESISTANCE

The Mobil Polyrex 461 EP formulation is enhanced with water-resistant polymers that enable it to form a tenacious protective film in applications that are heavily contaminated with water. The excellent results obtained for Mobil Polyrex 461 EP in the water washout (ASTM D 1264) and corrosion (ASTM D 6138) tests demonstrate the grease's ability to stay in place and protect bearings in wet environments.

 

In summary, Mobil Polyrex 461 EP offers the following features and benefits:

• Outstanding high-temperature oxidation stability

• Excellent mechanical shear stability

• Thermally stable extreme-pressure (EP) protection

• Wide operating temperature range -20°C (-4°F) to 160°C (320°F)

• Excellent dispensability in automatic grease systems

• Resistant to water washout and protects bearings from corrosion

 

Applications

Mobil Polyrex 461 EP is an excellent heavy-duty grease for a wide array of industrial and construction applications.

 

Properties and Specifications

Property

Grade

NLGI 1

SKF Emcor Rust Test, Distilled Water, ASTM D6138

0,0

Copper Strip Corrosion, Rating, ASTM D4048

1B

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

460

Dropping Point, °C, ASTM D2265

249

Water Washout, Loss @ 79 C, wt%, ASTM D1264

1

Rust, Rating, ASTM D1743

Pass

Penetration, 60X, 0.1 mm, ASTM D217

327

Four-Ball Extreme Pressure Test, Weld Load, kgf, ASTM D2596

400

Four-Ball Wear Test, Scar Diameter, mm, ASTM D2266

0.5

 

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

All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise.

05-2020


Exxon Mobil Corporation
22777 Springwoods Village Parkway
Spring TX 77389

1-800-ASK MOBIL (275-6624)

Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit www.exxonmobil.com
ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities.