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EC number: 235-462-4 | CAS number: 12236-62-3
Particle size distribution (Granulometry)
Administrative data
- Endpoint:
- particle size distribution (granulometry)
- Type of information:
- experimental study
- Adequacy of study:
- key study
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- test procedure in accordance with national standard methods with acceptable restrictions
- Remarks:
- According to appendix R7-1 of ECHA Guidance on Information Requirements and Chemical Safety Assessment multiple techniques should be applied to investigate phys. chem. properties of particulates, although different measurement methods may not provide comparable results. Laser diffraction is the well experienced standard procedure for pigments to determine particle size distribution of the pigment as it is manufactured and delivered.
Data source
Reference
- Reference Type:
- study report
- Title:
- Unnamed
- Year:
- 2 011
- Report date:
- 2011
Materials and methods
Test guideline
- Qualifier:
- according to guideline
- Guideline:
- ISO 13320 (Particle size analysis - Laser diffraction methods)
- Principles of method if other than guideline:
- Particle size determination by laser diffraction.
- Type of method:
- Laser scattering/diffraction
- Type of distribution:
- volumetric distribution
Test material
- Reference substance name:
- 2-[(4-chloro-2-nitrophenyl)azo]-N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-oxobutyramide
- EC Number:
- 235-462-4
- EC Name:
- 2-[(4-chloro-2-nitrophenyl)azo]-N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-3-oxobutyramide
- Cas Number:
- 12236-62-3
- Molecular formula:
- C17H13ClN6O5
- IUPAC Name:
- 2-[(4-chloro-2-nitrophenyl)diazenyl]-3-oxo-N-(2-oxo-2,3-dihydro-1H-benzimidazol-5-yl)butanamide
- Test material form:
- solid: bulk
Constituent 1
Results and discussion
Particle sizeopen allclose all
- Percentile:
- D10
- Mean:
- 0.45 µm
- St. dev.:
- 0.05
- Percentile:
- D50
- Mean:
- 1.75 µm
- St. dev.:
- 0.2
- Percentile:
- D90
- Mean:
- 53.26 µm
- St. dev.:
- 14.9
Any other information on results incl. tables
For further percentiles see attached report.
Given standard deviation is based on the general experience with the method and pigments. The estimated values are typical standard deviations for pigments:
D10: 4 % of D10 (minimum value 0.05 µm)
D50: 13 % of D50 (minimum value 0.1 µm)
D90: 29 % of D90 - D50
Applicant's summary and conclusion
- Conclusions:
- The test substance has a median particle size of 1.75 µm.
- Executive summary:
- The mass median diameter of the test item using Malvern laser diffraction (volumetric distribution) is 1.75 µm.
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