Hausner factor

The Hausner factor (after the Austrian powder metallurgist Henry H. Hausner (1900–1995)) is a dimensionless physical number for the characterization of solids ( shaped to lumpy bulk goods and heaps ). It is calculated as the quotient of the tamped density and the bulk density or as the quotient of the bulk volume and the tamped volume : ${\displaystyle H}$

${\displaystyle H={\frac {\rho _{\mathrm {st} }}{\rho _{\mathrm {sch} }}}={\frac {m}{V_{\mathrm {st} }}}\cdot {\frac {V_{\mathrm {sch} }}{m}}={\frac {V_{\mathrm {sch} }}{V_{\mathrm {st} }}}\geq 1}$

and is a measure of the volume reduction caused by shaking or pounding.

meaning

In technology , pharmacy , chemistry as well as the packaging and dosing of solids, the dosing accuracy, which is often controlled by volume, depends largely on the Hausner factor:

• ${\displaystyle H>1}$is an indicator that the volume-controlled dosing accuracy is difficult to keep consistently high and can be negatively influenced by vibrations during dosing and transport of the bulk material.
• ${\displaystyle H=1{,}00}$indicates that vibrations and shocks do not affect the volume of the bulk material , i.e. higher volume-controlled dosing accuracy can be achieved.

Individual evidence

1. ↑ S. Ebel and HJ Roth (editors): Lexikon der Pharmazie , Georg Thieme Verlag, 1987, p. 606, ISBN 3-13-672201-9 .