Hausner ratio is a simplest method to measure powder flow properties. It is a ratio of a powder’s tapped bulk density to its untapped bulk density. It can be calculated using measured values for bulk density (ρ bulk) and tapped density (ρ tapped) as follows:
Hausner Ratio = ρ tapped / ρ bulk
Hausner Ratio – Flow Character
- 1.00–1.11 = Excellent
- 1.12–1.18 = Good
- 1.19–1.25 = Fair
- 1.26–1.34 = Passable
- 1.35–1.45 = Poor
- 1.46–1.59 = Very poor
- >1.60 = Very, very poor
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