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Physical & Chemical properties

Particle size distribution (Granulometry)

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Description of key information

The particle size distribution of a sample of terephthalic acid typical of the Lead Registrant's commercial production was characterised by the Coulter method as follows: particles of diameter <4, <10 and <100 microns comprised 0.66%, 1.16% and 38.86%, respectively, of the sample by volume and 61.14% of the sample consisted of particles with a diameter >100 microns.

Additional information

The data provided by the Lead Registrant are compatible with other, independently collated data contributed by members of the Terephthalic 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: 15% to 30% smaller than 50 microns, 75% to 90% in the range 40 to 350 microns.