Bulk and Tapped Density

The bulk density of a material. It is the ratio of the mass to the volume (including the inter-particle void volume) of an untapped powder sample. 

The tapped density of powders or granulates is an increased bulk density attained after mechanically tapping a cylinder containing the sample.  

Analysis of Bulk and tapped density of powder give you a possibility: 

  1. To calculate the compressibility index and Hausner Ratio of your powder 
  1. These parameters give you an understanding of powder flowability and compressibility  

For Material experts: Instrument and measuring principle 

Bulk density depends on the density of the powder particles and their arrangement and the results are influenced by the preparation, treatment and storage of the sample material. The method used for measuring the bulk and tapped density of powders is described in the European Pharmacopoeia Chapter 2.9.34.   

Consult our Experts

Dr. Wenbo Wang
QC Chemist

Dr. Anna Shevchenko
Principal Scientist

Literature

Akseli I, Hilden J, Katz JM, Kelly RC, Kramer TT, Mao C, Osei-Yeboah F, Strong J.C. (2019) Reproducibility of the Abdullah EC, Geldart D (1999) The use of bulk density measurements as flowability indicators. Powder tech 102(2):151-65. 

measurement of bulk/tapped density of pharmaceutical powders between pharmaceutical laboratories. J Pharm Sci 108(3):1081-1084. 

Silva JS, Splendor D, Gonçalves IM, Costa P, Lobo JS (2013) Note on the measurement of bulk density and tapped density of powders according to the European Pharmacopeia. Aaps Pharmscitech. 4(3):1098-1100.  

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