A semi-fluid to solid product of a dispersion of a thickener in a liquid lubricant.
A substance composed of finely divided particles dispersed in a liquid lubricant to form the product′s structure.
The thickener can be fibres such as various metallic soaps or plates or spheres. These are insoluble or, at the most, only very slightly soluble in the liquid lubricant.
The general requirements are that the solid particles be extremely small, uniformly dispersed, and capable of forming a relatively stable, gel-like structure with the liquid lubricant.