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Particle size distribution (Granulometry)

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Description of key information

The particle size distribution of a sample of purified isophthalic acid typical of the Lead Registrant's commercial production was characterised by laser granulometry (dry measurement) as follows: D10, D50 and D90 = 13.60, 65.38 and 153.22 microns, respectively, on a percentage of volume basis. The volume mean diameter was 75.74 microns and the surface area (Sauter) mean diameter was 20.61 microns.  

Additional information

The data provided by the Lead Registrant are compatible with other, independently collated data contributed by members of the Isophthalic Acid Sub-Group of the Polyester Monomers Consortium (contributors anonymised, number of sources not known), whose collective particle size distribution data are described by the following envelope: 70% in the range 26 to 342 microns and 20% to 30% smaller than 50 microns.