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EC number: 428-040-8 | CAS number: 138261-41-3
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:
- 3 Mar 2021
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- guideline study
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- EPA OPPTS 830.7520 (Particle Size, Fiber Length, and Diameter Distribution)
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Qualifier:
- according to guideline
- Guideline:
- other: CIPAC MT 187
- GLP compliance:
- yes (incl. QA statement)
- Remarks:
- Hessisches Ministerium für Umwelt, Energie, Jugend, Familie und Gesundheit, Wiesbaden, Germany
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Percentile:
- D50
- Mean:
- 9.8 µm
- Remarks on result:
- other: standard deviation not reported
- Percentile:
- D10
- Mean:
- 2.7 µm
- Remarks on result:
- other: standard deviation not reported
- Percentile:
- D90
- Mean:
- 28.1 µm
- Remarks on result:
- other: standard deviation not reported
Reference
Results:
The test item consisted of transparent particles which appeared
irregular formed.
The test item was sieved with a mesh size of 1000 pm. 98.7 % (w/w) of
the test item passed the sieve and only this fraction was measured with
laser diffraction.
The particles were introduced to the analyser beam by the dry powder
feeder by direct spraying through the measurement area. The powder was
loosened by an integrated vibrator. The particles were dispersed and fed
to the optical system by pressurized dry air (1.5 bar). After passing
the analyser beam the sample was collected in a vacuum cleaner. After
adjusting the laser, measuring the background and adjusting the correct
particle concentration (obscuration) the measurement was started. The
control software automatically performed three measurements. The average
of these three measurements was given as result. Two test series of
three measurements each were performed. The measurement time was 8 s.
Individual results:
D50: 9.77 µm (1st test series), 9.82 µm (2nd test series)
D10: 2.64 µm (1st test series), 2.67 µm (2nd test series)
D90: 28.26 µm (1st test series, 27.95 µm (2nd test series)
Description of key information
The results of the laser diffraction experiment, volumetric distribution
(CIPAC MT 187, ISO13320 and under consideration of OECD 110 and US
EPA OCSPP 830.7520):
D50: 9.8 µm
D10: 2.7 µm
D90: 28.1 µm
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