It is apparent that the “oiliness” of fatty acids is due mainly to their capacity to form metallic soaps on metal surfaces. If one puts a fatty acid on a non‐reactive surface, such as chromium or platinum, it fails to show better results than a straight mineral oil, due to the inability of the acid to form a soap readily. This emphasizes, quite clearly, the fact that one should consider, in lubrication, not only the lubricant but the surface with which it is to be used. In other words, the criterion of lubrication efficiency is, primarily, the lubricant‐bearing combination, and not the lubricant alone.
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