Unirex™ S 2

Mobil industrial , Barbados


Product Description

Unirex™ S 2 is a lithium complex thickened high-temperature grease, based on a low volatility, synthetic polyol ester fluid, fortified with performance-enhancing additives. It is uniquely suited for high temperature applications, with an upper operating temperature recommendation of 200º C / 392°F based upon ASTM D3336 performance. Additionally this grease possesses good oxidation stability, and rust preventive characteristics.


Features and Benefits

Unirex S 2 grease is specially developed for high temperature applications where mineral oil based greases may not provide adequate protection. The ester base fluid has a low volatility at the working temperatures involved, this can lead to long grease life when compared to a conventional mineral oil product. Unirex S 2 is suitable for high temperature operations where frequent relubrication is not practical.

This product offers the following performance features:

•  Outstanding high-temperature performance with better lubricity and wear protection than conventional grease

•  Low base stock volatility helping to provide long lubricant life and potentially extend re-lubrication intervals.

•  An upper operating temperature of 200º C /392°F based upon ASTM D3336 High Temperature Life performance



Application notes: The ester base oil of Unirex S 2 is not compatible with many common elastomer seal materials. For example, it may cause a softening or swelling of NBR seals. It is recommended that the equipment manufacturer or your ExxonMobil representative be consulted regarding seal compatibility in a specific application.


Unirex S 2 is recommended by ExxonMobil for severe applications including:

     •  Conveyor bearings in kilns and ovens

     •  Steel mill ladle bearings

     •  Jet aircraft starter clutch assemblies

     •  Critical oven bearings in Fiberglas manufacture


Properties and Specifications



NLGI 1.5

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


Color, Visual


Corrosion Preventive Properties, Rating, ASTM D1743


Dropping Point, °C, ASTM D2265


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


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


Lubrication Life @ 204 C, h, ASTM D3336


Oil Separation, mass%, ASTM D1742


Penetration, 60X, 0.1 mm, ASTM D217



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.