The ASTM D445-23 standard is a standard test method for the measurement of kinematic viscosity of transparent and opaque liquids and is particularly suitable for viscosity evaluation of petroleum products and Miscellaneous liquid materials. The method determines kinematic viscosity 1a by measuring the time a liquid passes within a precisely calibrated Glass Capillary Viscometer. dynamic viscosity η can be calculated by multiplying the liquid density δ. This standard covers the kinematic viscosity range from 0.2 mm ²/s to 300,000 mm ²/s and is applicable at all temperatures. Test results are influenced by the flow characteristics of the sample and are applicable to liquids that behave as newtonian fluids. Standards not only apply to quality control and product specification compliance, but are also important for research and development and evaluation of New materials to ensure proper flow performance of liquids under various operating conditions.