Simply stated, viscosity is a measure of a fluid’s internal resistance to flow. These advertisements make it seem like viscosity is a complex chemical property of the fluid, when in fact it is a measurement of a physical property. In recent years, some large lubricant marketers have run advertisements on TV that highlight the importance of viscosity breakdown. This paper will summarize some of the more commonly used viscosity standards, describe the tests used to measure viscosity, and eliminate some of the confusion all of these standards may create for the end user. Some examples are SUS, cSt, cP, ISO, SAE engine, SAE gear and AGMA it’s enough to make a person’s head start to spin.
That doesn’t sound too difficult, does it? Unfortunately, new temperature, speed and pressure demands on lubricating fluids have changed over the years, resulting in several different measurements and classifications being created to describe lubricant viscosity. Simply stated, viscosity is defined as the internal resistance of a fluid to flow. By John Sander, VP Technology, Lubrication Engineers Inc.
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