Registration Dossier
Registration Dossier
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EC number: 204-464-7 | CAS number: 121-32-4
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:
- February-March 2010
- Reliability:
- 1 (reliable without restriction)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods
- Remarks:
- Standardised method performed on all internal powders and flakes.
- Qualifier:
- no guideline followed
- Principles of method if other than guideline:
- Particle size distribution was performed on bulk powders by laser diffraction. Sieving analysis was performed on flakes. Fine fractions (particles < 100 µm) coming from sieving analysis were characterized by laser diffraction.
- GLP compliance:
- no
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
- Percentile:
- D50
- Mean:
- 151.4 µm
- Remarks on result:
- other: No source field for Standard deviation.
- Percentile:
- D10
- Mean:
- 74.8 µm
- Remarks on result:
- other: No source field for Standard deviation.
- Percentile:
- D50
- Mean:
- 151.4 µm
- Remarks on result:
- other: No source field for Standard deviation.
- Percentile:
- D90
- Mean:
- 281.3 µm
- Remarks on result:
- other: No source field for Standard deviation.
- Conclusions:
- Particle size distribution of Ethylvaniilin was characterized through laser diffraction analysis and by sieving for powder and the D50 is 151.4 µm.
- Executive summary:
In a study (Rhodia 2010), particle size distribution of Ethylvanillin (purity > 99%) was characterized with pictures by digital camera and under microscopy for qualitative data. Size distribution has been investigated by standard sieving and laser granulometry methods.
The determined D50, by diffraction laser was 151.4 µm for ethylvanilline.
Reference
Picture digital camera: White powder of fine crystals, with some agglomerates and lumps.
Microscope pictures: Morphology: fine crystals from 50 to > 300 µm with various shapes, major presence of very small particles in the range 30 to 50µm.
Classes of particles<105µm : 24.2% in volume.
Description of key information
D50: 151.4µm
Additional information
Two studies were available, giving the same range of particle size.
One of them (CRTL, 2010) was chosen as key study and has reliability 1 according to Klimisch scale. The determined D50 for Ethylvanillin was 151.4 µm in this study.
The other study (Vibert, 2004) gave a particle size D50 of 200 µm, and was selected as supporting study (Klimisch scale of 2).
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