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EC number: 202-830-0 | CAS number: 100-21-0
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
- 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.
Reference
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.
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