ASTM D4212-2010 (2014) Standard Test Method for Viscosity Using Impregnated Viscosity Cups is a standard developed by the American Society for Testing and Materials (ASTM) to determine the viscosity of liquid materials such as paints, varnishes, inks, etc. The method uses impregnated viscosity cups to measure the time of liquid outflow to calculate its viscosity value. It is applicable to newtonian fluids and some non-newtonian fluids, and is suitable for viscosity control in factories and laboratories. The standard provides a scientific basis for quality control and Product Research & Development in the Coatings, inks, and other industries to ensure that the flowability and construction performance of materials meet requirements.