Abstract
Antifoaming properties of lubricating oils are reviewed. There are two types of foaming in lubricating oils. One is surface foaming and another is air bubbles in oils. Surface foaming causes overflow of the oil from the reservoir, and air bubbles in oils promote cavitation erosion and wear brought about breakdown of oil film by bubbles. Usually antifoaming agents are added into lubricating oils. However, effects of antifoaming additives are influenced by base oils and other additives or mixing methods. In this review, effects of these several factors on antifoaming properties are summarized.
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