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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
24 Mar 2010
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: see 'Remark'
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.
Qualifier:
according to guideline
Guideline:
other: ISO 13320-1
Principles of method if other than guideline:
Particle size determination by laser diffraction
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Percentile:
D50
Mean:
8 µm
Remarks on result:
other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
Percentile:
D10
Mean:
1.03 µm
St. dev.:
0.05
Percentile:
D50
Mean:
8 µm
St. dev.:
1
Percentile:
D90
Mean:
36.6 µm
St. dev.:
8.3

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

Conclusions:
The test substance has a median particle size of 8.0 micrometer.
Executive summary:

The particle size of the test substance was determined by Malvern laser diffraction. The test substance has a median particle size of 8.0 micrometer.

Description of key information

The particle size of the test substance was determined by Malvern laser diffraction. The test substance has a median particle size of 8.0 micrometer.

Additional information