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Physical & Chemical properties

Particle size distribution (Granulometry)

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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:
2019
Report date:
2019

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

Constituent 1
Chemical structure
Reference substance name:
5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14-dione
EC Number:
213-561-3
EC Name:
5,12-dihydro-2,9-dimethylquino[2,3-b]acridine-7,14-dione
Cas Number:
980-26-7
Molecular formula:
C22H16N2O2
IUPAC Name:
2,9-dimethyl-5,12-dihydroquino[2,3-b]acridine-7,14-dione
Test material form:
solid: nanoform
Details on test material:
test substance: PV Fast Pink E
batch: DEB8073623
purity: > 99 % (w/w) C.I. Pigment Red 122

Results and discussion

Particle sizeopen allclose all
Percentile:
D10
Mean:
0.5 µm
St. dev.:
0.05
Percentile:
D50
Mean:
2.03 µm
St. dev.:
0.26
Percentile:
D90
Mean:
5.54 µm
St. dev.:
1

Any other information on results incl. tables

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

A monomodal particle size distribution was observed.

Applicant's summary and conclusion