Semisolid Lubricant :-

(i) By adding animal and vegetable fats to soap and water, it is possible to create grease lubricants (semi solid lubricant). Lubricating oil is the principal component and it can be either petroleum oil or a synthetic hydrocarbon of low to high viscosity. The thickeners consist primarily of special soaps of Li, Na, Ca, Ba, Al, etc. Non-soap thickeners include carbon black, silica gel, polyureas and other synthetic polymers, clays, etc.

(ii) Grease can support much heavier load at lower speed. Internal resistance of grease is much higher than that of lubricating oils; therefore it is better to use oil instead of grease. Compared to lubricating oils ,grease cannot effectively dissipate heat from the bearings, so work at relatively lower temp

Grease, vaseline, wax and other similar compounds are semi solid lubricants.