Viscosity testing methods8/25/2023 ![]() In this article, after a brief introduction to terminology, we will elaborate how statistical equations documented in alternate test methods can aid in reporting bias-corrected measurement results, using the kinematic viscosity test methods ASTM D445¹ and the novel ASTM D7042² as examples. This enables users of the alternate method to report results that can be considered practically equivalent to the reference method. ![]() Upon positive evaluation of the newly proposed method and its incorporation into the specification, formulae derived from statistical data generated in the process may be utilized by the end user of the standard. Hence, standard development organizations (SDOs) have established statistical methodologies to provide conclusive data to the respective committees as a basis for decision-making. Common points to be addressed typically involve the precision of the new alternatives for the sample types and property ranges under investigation as well as the bias with regard to existing methods. For each specified parameter, allowed test methods are reported, and discussions about the inclusion of novel alternates to established procedures have always been an important part of the standard development process. With the petroleum industry representing a market heavily driven by standards, compliance with national and international norms is of the utmost importance.
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