GB/T 23652-2009 specifies the determination method of Resin tap apparent density (pb) for homopolymerization and copolymerization of plastic vinyl chloride. The standard clarifies the test principle, standardizes the preparation requirements of instruments and equipment, and elaborates the vibration operation process and density calculation method in detail. At the same time, it stipulates the test precision. It provides a unified technical criterion for the accurate determination of this type of Resin tap apparent density (pb), which is helpful for evaluating Resin processing performance and guiding production and quality control.