Kinematic Viscosity: A Key Indicator for Assessing Lubricant Quality
Release time：2026-04-22
Kinematic viscosity is a measure of a liquid’s resistance to flow under the influence of gravity. For lubricating oils, it serves as the basis for grade designation—such as grades 32, 46, and 68. If the viscosity is too high, the oil exhibits poor fluidity, leading to increased wear during startup; if it is too low, the oil film lacks sufficient strength, failing to provide effective lubrication. Consequently, viscosity testing is an essential quality‑control step in both the production and application of lubricants. The commonly used method involves employing a capillary viscometer: a specified volume of liquid is allowed to flow through a capillary within a thermostated bath, and the time taken is multiplied by the viscometer’s calibration constant to obtain the kinematic viscosity. Modern kinematic viscometers are equipped with automatic temperature control, timing, and cleaning functions, significantly enhancing testing efficiency and accuracy. The product line from Jingzhou Chuangbo Instruments has been widely adopted across sectors including power generation, machinery, and transportation.
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