The ASTM D5125-10 (2020) e1 standard specifies a test method for measuring the viscosity of Coatings and related materials using ISO flow cups. This method evaluates the flowability and viscosity consistency of Coatings and Miscellaneous materials by measuring the time the liquid passes through the standardized flow cup. The flow cup is a simple and intuitive measurement tool that can quickly obtain the viscosity value of the liquid, which is important for the production, quality control and formulation optimization of Coatings. This method is suitable for a variety of Coatings, inks and Miscellaneous liquid materials, and can help users evaluate their processing performance and application effect, and ensure that the Coatings meet technical requirements.