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EC number: 231-302-2 | CAS number: 7488-55-3
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
- Reliability:
- 2 (reliable with restrictions)
- Rationale for reliability incl. deficiencies:
- comparable to guideline study with acceptable restrictions
- Qualifier:
- equivalent or similar to guideline
- Guideline:
- DIN 55992-1 (Determination of a parameter for the dust formation of pigments and extenders - Part 1: Rotation method)
- Version / remarks:
- 2008
- Deviations:
- yes
- Remarks:
- instead of the Heubach dust meter was used a seven stage cascade impactor
- Principles of method if other than guideline:
- instead of the Heubach dust meter was used a seven stage cascade impactor to determined the dust fractions accordning to DIN EN 481.
Air flow rate 40 L/min instead of 20L/ min (reason: use of cascade impactor instead of Heubach dust meter) - GLP compliance:
- no
- Other quality assurance:
- ISO/IEC 17025 (General requirements for the competence of testing and calibration laboratories)
- Type of method:
- Laser scattering/diffraction
- Type of particle tested:
- primary particle
- Type of distribution:
- mass based distribution
- Mass median aerodynamic diameter:
- > 2.6 µm
- Geometric standard deviation:
- > 1 - < 100
- Remarks on result:
- other: no data
- Percentile:
- D50
- Mean:
- ca. 20 µm
- Remarks on result:
- other: according DIN EN 481
- No.:
- #1
- Size:
- > 100 µm
- Distribution:
- 0 %
- No.:
- #2
- Size:
- > 63 - < 100 µm
- Distribution:
- 14.99 %
- No.:
- #3
- Size:
- > 25.48 - < 63 µm
- Distribution:
- 23 %
- No.:
- #4
- Size:
- > 12.41 - < 25.46 µm
- Distribution:
- 55.76 %
- No.:
- #5
- Size:
- > 6.39 - < 12.41 µm
- Distribution:
- 5.6 %
- No.:
- #6
- Size:
- > 3.19 - < 6.39 µm
- Distribution:
- 0.43 %
- No.:
- #7
- Size:
- > 1.6 - < 3.19 µm
- Distribution:
- 0.03 %
- Conclusions:
- The concentration of the respirable fraction in the impactor is 0.85 mg/m³. The exposure limit for workplace is for the respirable fraction 1 mg/m³. The short time exposure limit is higher. So there is no danger from this substance.
- Executive summary:
A sieve test was done in a non-GLP study similar to DIN 55992-1 according to ISO/IEC 17025. The particle size disribution shows, that there are no particles bigger than 100 µm. 14.99 % of the particles are in the range between 63 and 100 µm, 23 % in the range between 25.48 and 63 µm, 55.76 % in the range between 12.41 and 25.48 µm, 5.6 % in the range between 6.39 and 12.41 µm, 0.34 % in the range between 3.19 and 6.39 µm and 0.03 % in the range between 1.6 and 3.19 µm. The d50 is estimated to be about 20 µm.
Reference
Quantity of substance used: 1g
Total dust mass in impactor: 138.31 mg
Dust concentration in impactor: 698.40 mg/m³
Total dustiness: 180.31 mg/g
Inhalable fraction: 80.59 mg/g
Thoracic fraction: 6.76 mg/g
Respirable fraction: 0.17 mg/g
values according to EN 481
Determination of the concentration of respirable fraction in impactor:
(Dust concentration in the impactor) / (total dust mass in the impactor) x (respirable fraction) = 0.85 mg/m³
Description of key information
A sieve test was done in a non-GLP study similar to DIN 55992-1 according to ISO/IEC 17025. The particle size disribution shows, that there are no particles bigger than 100 µm. 14.99 % of the particles are in the range between 63 and 100 µm, 23 % in the range between 25.48 and 63 µm, 55.76 % in the range between 12.41 and 25.48 µm, 5.6 % in the range between 6.39 and 12.41 µm, 0.34 % in the range between 3.19 and 6.39 µm and 0.03 % in the range between 1.6 and 3.19 µm. The d50 is estimated to be about 20 µm.
Additional information
The concentration of the respirable fraction in the impactor is 0.85 mg/m³. The exposure limit for workplace is for the respirable fraction 1 mg/m³
the short time exposure limit is higher. So the is no danger through this substance.
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