![]() ![]() This difference is unavoidable since any mechanical system is exposed to the fluctuation of the environmental and mechanical operating factors (temperature, load, speed, friction, etc.).Īny industrial lubricant’s viscosity is often found to be quoted in manufacturer’s catalog in terms of the standardized unit. ![]() Thereby, it can be inexplicably understood that the laboratory measured viscosity is dramatically different than the viscosity which is effective inside the system during operation. In addition, lubricant’s chemical make-ups and any alteration to it during operation are some of other important causes to influence a lubricant’s effective viscosity. These influences in turn depends on friction, load, speed, and machine operating environments. Lubricant’s viscosity may be physically and/or chemically affected by a number of factors however, some of the prominent influencing agents are temperature, pressure, and shear stress. However, what is often overlooked in such easy comprehension on lubricant’s viscosity is the gap between the effective viscosity and quoted (laboratory measured) viscosity of any lubricant. Primary purpose of any industrial lubricant is to maintain a satisfactory lubricating film in between contacting surfaces and importance of viscosity to achieve this is univocally known in industrial maintenance practices.
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