ASTM D4212-16 (2023) Standard Test Method for the Determination of Viscosity with Impregnated Viscosity Cups specifies a standard test method for the measurement of viscosity of liquids or coatings by impregnated viscosity cups. This method is suitable for determining the kinematic viscosity of liquid samples with specific fluidity, especially in Coatings and Miscellaneous industrial products. Impregnated viscosity cups evaluate viscosity by immersing sample liquids and measuring the time it takes for them to flow out of the cup. This standard provides clear operating steps for accurate measurement and control of the rheological properties of products, helping manufacturers ensure product mass Stability and conformity.