Registration Dossier

Physical & Chemical properties

Particle size distribution (Granulometry)

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2020-09-09
Reliability:
2 (reliable with restrictions)
Reason / purpose for cross-reference:
reference to same study
Qualifier:
no guideline followed
Principles of method if other than guideline:
Electrical sensing zone (Coulter) method.
GLP compliance:
no
Type of method:
electrical sensing zone (e.g. Coulter) method
Type of distribution:
volumetric distribution
No.:
#1
Size:
< 4 µm
Distribution:
0.66 %
No.:
#2
Size:
< 10 µm
Distribution:
1.16 %
No.:
#3
Size:
< 100 µm
Distribution:
38.86 %
No.:
#4
Size:
> 100 µm
Distribution:
61.14 %
Conclusions:
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.

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.