This standard specifies the method for determining the "packing density" of coal-based granular activated carbon. It involves filling a specific-volume measuring cylinder (e.g., 100 mL) with the activated carbon sample under specified conditions, followed by vibration or tapping to achieve a compact state. The mass of the sample within that volume is then weighed to calculate the packing weight per unit volume, which is used to evaluate its compactness and filling performance. This standard is equivalent to the international standard ASTM D 2854. The core instruments for performing this test are a balance and a measuring cylinder of specified dimensions (e.g., 100 mL). During the determination, a tapping or vibration device is typically used to ensure the granules reach a tightly packed state in the cylinder.