Greases
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People generally associate lubricants with oils but in fact there are a great many applications where non-liquid lubricants are used, with the most obvious of these being greases.
According to the ASTM (American Society for Testing and Materials), lubricating grease is a solid or semi-fluid substance containing a thickener agent and a lubricating liquid. Other ingredients such as additives and solid lubricants can also be added to give it specific properties.
This definition establishes the fundamental concept that grease is not a very viscose oil but rather a thickened oil, a multi-phase system made up of two distinct components represented by a thickener agent and fluid oil. Therefore, the consistency of the product can be varied by varying the amount of thickener, something which is codified by an NLGI number (National Lubricating Grease Institute - USA).