Thickening agents mineral compounds

Lubricating grease, as defined by ASTM, is a solid to semifluid product consisting of a dispersion of a thickening agent in a liquid lubricant. In more practical terms, most greases are stabilized mixtures of mineral oil and metallic soap. The soap is usually a calcium, sodium, or lithium compound and is present in the form of fibers whose size and configuration are characteristic of the metallic radical in the soap compound. 

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