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Abstract
A comparative study of the performance of two instruments widely used by the US PM industry to obtain precise, rapid evaluation of metal powder apparent density, the Arnold density meter and the Hall flowmeter, has been conducted. As received water atomised iron powder, screened fractions of this powder, and reblends of the size fractions were tested at various relative humidities. The Arnold meter was found to be more sensitive to small changes in apparent density and to give results more representative of flow in industrial die filling operations, whereas the Hall meter showed greater sensitivity to powder surface smoothness. PM/0582