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See Chinese contents: GB/T 21354-2008 GB/T 21354-2008: Powders -- Determination of tap density
This standard specifies the method for measuring the tap density, that is, the powder in the container is tapped under certain conditions. Use a tapping apparatus to tap the specified amount of powder in the container until the volume of the powder cannot be further decreased. The mass of the powder divided by the volume is the tap density.
