These attributes lead to a reduced cost per test while providing higher precision (including determinability, repeatability and reproducibility targets) associated with a standardized test.ĭ445 kinematic viscosity measurement principles are simple - measure the time required for a known volume of liquid to transition between two fixed points in a vertically oriented capillary viscometer under the sole influence of gravity. Today, the economics of owning and operating automated D445 viscometers have improved with the arrival of newer, smaller, quicker and less capital-intensive designs. However, improved precision typically comes with higher costs. The primary aim of standardization is improved precision and better interlaboratory reproducibility of results. In the September-October issue of Practicing Oil Analysis, several advantages of using standardized test methodology were discussed, for example, the use of ASTM D445 for the viscosity measurement of used oil.
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