They are made from two dissimilar acids reacted with aluminum iso-propoxide to form a complex soap molecule. They have high dropping points, excellent water resistance and good pump ability depending on the mineral oil used. They respond well to additive treatments which fortifies the grease for high loads.
There are two main drawbacks, namely poor shear stability and poor corrosion protection against rust and corrosion. Applications are typically found in heavy industries, steel mills and food machinery
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