Of course, greases are formulated with oil, thickener and additives. While you may be familiar with the formulation of grease, do you know what grease consistency means and how it should influence your grease selection? Base Oil Grease is formulated with up to 95 percent base oil. Most greases today use mineral oil as their fluid components. These mineral oil-based greases typically provide satisfactory performance in most industrial applications.
More than 95 percent of all components are lubricated with oil, not because it lubricates better but because it has a wider variety of properties. Grease generally is used only if oils cannot be utilized because sealing the lubrication point is problematic or expensive. Typically, grease is applied on rolling bearings, with nearly 80 percent of these bearings lubricated with grease. During analysis, oils and grease behave similarly. Although both contain important information, it is more difficult to interpret the results for grease.
If a grease contains too much water, it is important to find the origin and eliminate it. The Karl Fischer method provides quantitative information about water content. The elements investigated by atomic emission spectroscopy help to distinguish between condensate and tap water. If water was not removed effectively during the production of the grease, it may be found in the fresh grease sample. An analysis of fresh and used grease will clarify this matter.
Besides consistency, other properties such as structural and mechanical stability, apparent viscosity, resistance to oxidation, etc. This involves two test apparatus. The first apparatus consists of a closed container and a piston-like plunger. The face of the plunger is perforated to allow grease to flow from one side of the plunger to another as the plunger is worked up and down.