This standard specifies the method for determining the apparent viscosity of Resin in liquid, milky Resin or dispersion Resin in plastics using a single cylindrical rotational viscometer. The apparent viscosity is an important indicator reflecting the rheological properties of Resin and is of great significance to the processing performance and application effect of Resin. This standard specifies the technical requirements of the test equipment, the setting of test conditions, the operation steps and the calculation method of the results to ensure the Reliability and comparability of the measurement results.