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What are the compressibility and Hausner ratio?

2023-02-10WIKI

The compressibility and the Hausner ratio can be calculated using the bulk density and the tapped density, which are utilized to indicate the flowability of powder material.

The calculation of the compressibility:

 

The calculation formula of the compressibility

 

The calculation of the Hausner ratio:

 

The calculation formula of the Hausner ratio

 

where ρT is the tapped density, and ρB is the bulk density.

The flowability of a powder can be characterized based on the compressibility or the Hausner ratio. A lower compressibility or a lower Hausner ratio of a material indicates better flow properties. A compressibility of <10 or a Hausner ratio of <1.11 is considered an “excellent” flow, whereas a compressibility of >38 or a Hausner ratio of >1.60 is considered a “very poor” flow.

Flowability
Compressibility
Hausner Ratio
Excellent <10
1.00-1.11
Good 
11-15 1.12-1.18
Fair 
16-20 1.19-1.25
Passable 
21-25 1.26-1.34
Poor 
26-31 1.35-1.45
Very Poor 
32-37 1.46-1.59
Very Very Poor 
>38  >1.60

 

The flowability of a powder material can be evaluated by integrating the compressibility, the Hausner ratio, and the angle of repose. It is also possible to predict the flowability of the material through individual parameters.

 

 

 

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