scope:

This standard describes methods for determining the average particle size of a sample of fine metal powders using air permeability of a packed powder bed. This method is not generally used for mixed powders. The values obtained may not be absolute, but are reproducible, and are highly useful on a relative basis for control purposes.

With the exception of the units for density and mass, for which g/cm³ and g are the industry standards; and the units for pressure, cm H₂O-long-standing industry practice-values in SI units are to be regarded as standard.

This standard may involve hazardous materials, operations and equipment. This standard does not purport to address all of the potential safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and to determine the applicability of regulatory limitations prior to use.