Tapped density and Bulk density

Tapped density and bulk density are two important measurements used to characterize the properties of a powder.

Definition of Bulk density :

  • It is refers to the mass of the powder divided by the total volume it occupies, including the voids or spaces between the particles. It is typically measured by pouring a known mass of the powder into a graduated cylinder and measuring its volume.
  • Bulk density is an important parameter in determining the packaging, shipping, and storage requirements of powders.
  • Calculation / Formula of Bulk Density:
  • D = M / V,
    • where,
      • D: Bulk density ( in g/l)
      • M: Weight of the full container (in g)
      • V: Container volume (in l)

Definition of Tapped density:

  • It is refers to the mass of the powder divided by the tapped volume, which is the volume occupied by the powder after it has been subjected to a defined tapping process.
  • The tapping process is designed to simulate the packing and settling that occurs during transportation and handling. Tapped density is a more accurate measure of the true density of the powder, as it accounts for the compaction that occurs due to tapping.
  • Both bulk density and tapped density are important parameters in powder processing and manufacturing, as they can affect the flow, compressibility, and other properties of the powder. They are also useful in quality control, as they can be used to monitor the consistency and uniformity of powders over time.
  • Tapped Density measured by Tapped Density Tester.
Tapped Density Tester
  • Calculation / Formula of Tapped Density:
  • T= M / Vt,
    • where,
      • T: Tapped density ( in g/l)
      • M: Weight of the full container (in g)
      • Vt: Container volume after tapping (in l)

Reference: bulk and tapped density usp

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