The term grease is used to describe semi-solid lubricants. In the context of lubrication, it typically applies to a material consisting of a soap emulsified with mineral or vegetable oil.
The characteristic feature of greases is that they possess a high initial viscosity, which, upon the application of shear, drops to give the effect of an oil-lubricated bearing of approximately the same viscosity as the base oil used in the grease.
Greases are applied to mechanisms that can only be lubricated infrequently and where lubricating oil would not stay in position. They also act as sealants to prevent ingress of water and incompressible materials. Grease-lubricated bearings have greater frictional characteristics due to their high viscosity.
Greases, like waxes, are also a multi-billion dollar commodity market with some estimates putting the market size at $12B.
At GreenMantra, we have successfully test marketed grease as one of the potential outputs of our process. However, we continue to currently focus on waxes as our initial market.