Where greases are applied as a lubricant?

Greases are applied where oils cannot be used as a lubricant. For example, in places where sealing does not exist or is inadequate, dirty environments, in inaccessible locations, in places where oil dripping or splashing cannot be tolerated.

Greases are classified based on the basis of soap type, soap content, base oil viscosity, dropping point and consistency. Consistency mainly is a measure of grease sealing properties, texture and dispensability. 

Lithium soap greases- it is generally are water resistant and corrosion inhibitor and have good mechanical and oxidation stability.

Sodium soap greases- it is generally are low torque resistance, excellent high temperature performance and ability to absorb moisture.

Calcium soap greases- It is generally are multi purpose grease, resist water wash out, non corrosive to most metals, work well in both grease cups and centralized lubrication systems. 

Greases are fine dispersion's of oil-insoluble thickening agents usually soap in a fluid lubricant such as mineral oil. When a bearing lubricated with grease and start to move, the grease structure is affected by the shearing action, and lubrication is provided by the oil component of the grease.