Calcium complex grease is made by reacting two dissimilar acids with hydrated lime to form a complex molecule. These dissimilar acids, acetic and stearic, when increased to the proper amounts, will yield a natural, high, extreme-pressure rating, usually around a 55 on the Timken O.K. Load. This is one of their advantages.
They also have the advantage of good stability at higher temperatures and are extremely resistant to water washout. The disadvantages are that they harden considerably at elevated temperatures, separate under pressure, cause caking when used in pressurized central systems, have poor pump ability and mechanical stability, softening rapidly when sheared.
Calcium complexes should not be considered as multipurpose greases. They are very useful, but should be considered carefully beforehand.
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