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What is the composition of Masterpact cluster grease S48899?

Published date: 31 March 2020

Cluster grease composition

Product Line:
Circuit Breakers

Masterpact NW and NT

This grease is Mobil100 and further detail on composition must be obtained from the manufacturer, ExxonMobil.  Note that the excerpt from their web page below says they are not 100% specific as to the composition of this grease.
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

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.

MSDS is attached: for more information, please contact the manufacturer:

Exxon Mobil Corporation
3225 Gallows Road
Fairfax, VA 22037
1-800-ASK MOBIL (275-6624)

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