Conversion Factors to Convert Particle Size Distributions Measured by One Method to Those Measured by Another Method

It is shown that the conversion of size distributions measured with a laser diffractometer or sedimentometer to equivalent sieve size distribution depends not only on a mean shape factor but also on the size distribution being measured. An equation is given for calculating an overall conversion factor when the cumulative sieve size distribution is of the Schuhmann form P(x)=(x/k)^m. The technique is illustrated using results from a laser diffractometer and the X-ray Sedigraph, and gives the conversion factors from diffractometer to sedigraph and vice versa.