Abstract
The purpose of this review gives the outline of lubricating greases and is to show the basic principle about proper selection and use of them. Lubricating greases were devided into four classes, that is, water-resistant type, water-soluble type, multi-purpose type and synthetic grease, and each characteristic was outlined. Then, their physical and functional properties, structures, additives, rust-preventing behaviors and fillers, as well as the value and significance of physical testing were described. Finally, the lubricating action of lubricating greases in bearings was briefly discussed.