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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.
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:
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:
|Property||Unirex S 2|
|Worked Penetration,, ASTM D 217, mm/10||280|
|Dropping Point ASTM D 2265, ºC||280|
|4-Ball Wear, scar diameter, ASTM D 2266, mm||0.60|
|Viscosity of Base Oil at 40 ºC, ASTM D 445, cSt||170|
|Oil Separation, ASTM D 1742, mass %||3|
|Lubrication life at 204 ºC, ASTM D 3336, hours||500|
|Corrosion Prevention, ASTM D 1743, Rating||Pass|
|4-Ball Weld Load, ASTM D 2596, Kg||160|