Registration Dossier

Physical & Chemical properties

Particle size distribution (Granulometry)

Administrative data

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
documentation insufficient for assessment

Data source

Reference
Reference Type:
study report
Title:
Unnamed
Year:
2002
Report Date:
2002

Materials and methods

Test guideline
Qualifier:
equivalent or similar to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
for particles <500 µm
Principles of method if other than guideline:
for particles >500 µm: sieving by vibration
GLP compliance:
no
Type of method:
Laser scattering/diffraction
Remarks:
+ sieving by vibration
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution

Test material

Reference
Name:
Unnamed
Type:
Constituent
Test material form:
solid: particulate/powder
Details on test material:
Name of test material (as cited in study report): TMH

Results and discussion

Particle sizeopen allclose all
Key result
Percentile:
D50
Mean:
ca. 100 µm
Remarks on result:
other: St. dev. not stated
Key result
Percentile:
D10
Mean:
ca. 30 µm
Remarks on result:
other: St. dev. not stated
Particle size distribution at different passagesopen allclose all
No.:
#1
Size:
< 10 000 µm
Distribution:
>= 95 - <= 100 %
No.:
#2
Size:
< 1 000 µm
Distribution:
>= 72 - <= 92 %
No.:
#3
Size:
< 100 µm
Distribution:
>= 42 - <= 62 %
No.:
#4
Size:
< 10 µm
Distribution:
>= 1 - <= 3 %
No.:
#5
Size:
< 4 µm
Distribution:
0 %

Applicant's summary and conclusion

Conclusions:
Trimethylhydroquinone has a median particle size D50 of approx.100 µm.
Executive summary:

Different samples of trimethylhydroquinone were analysed via sieving and laser diffraction with the result that the particle size distribution lies between 5 and 10 000 µm. The median particle size D50 is estimated to be 100 µm.