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From "Lubrication Fundamentals"
Greases are available with many thickener types,
additives, and base oils. As a result, mixing of different
greases could result in altering performance or physical properties
(incompatibility), which could lead to a grease (mixture) that
exhibits characteristics inferior to those of either grease
before mixing. The mixing of incompatible greases will alter
properties such as consistency, pumpability, shear stability,
oil separation, and oxidation stability. Generally, when two
incompatible greases are mixed, the result is a softening,
which can lead to increased leakage as well as loss of other
performance features.
Equipment performance problems as a result
of mixing incompatible greases could manifest themselves
after a relatively short period of operation but usually
occur over
longer time periods, sometimes making it difficult to trace
the source of the problem back to mixing of incompatible
greases. When it becomes necessary to use different greases,
it is best
to mix greases of the same thickener type, but in all cases
compatibility charts and the grease suppliers should be consulted.
However, the safest practice is to avoid mixing of greases.
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