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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Administrative data

Endpoint:
nanomaterial aspect ratio/shape
Type of information:
experimental study
Adequacy of study:
key study
Study period:
2019
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods with acceptable restrictions

Data source

Reference
Reference Type:
other: unpublished report
Title:
Unnamed
Year:
2019
Report date:
2019

Materials and methods

Principles of method if other than guideline:
Assessment of a potential nanomaterial according to COMMISSION REGULATION (EU) 2018/1881 by Particle Size Analysis
GLP compliance:
no
Type of method:
transmission electron microscopy
Details on methods and data evaluation:
Specimen Support Grids: Cu grids coated with a Formvar film.
Specimen preparation: A few mg of the previously wobbled/shaken pigment powder was dispersed in distillated water in an ultrasonic bath. A droplet of the well dispersed and diluted pigment dispersion was transferred to a TEM-grid (Cu) coated with a polymer support film (Formvar®).

Test material

Constituent 1
Chemical structure
Reference substance name:
Manganese, 4-[(5-chloro-4-methyl-2-sulfophenyl)azo]-3-hydroxy-2-naphthalenecarboxylic acid complex
EC Number:
226-102-7
EC Name:
Manganese, 4-[(5-chloro-4-methyl-2-sulfophenyl)azo]-3-hydroxy-2-naphthalenecarboxylic acid complex
Cas Number:
5280-66-0
Molecular formula:
C18H11N2O6SClMn
IUPAC Name:
10-carboxy-19-chloro-18-methyl-15,15-dioxo-12λ³,14λ³-dioxa-15λ⁶-thia-1λ⁴,22-diaza-13-manganapentacyclo[11.9.0.0²,¹¹.0³,⁸.0¹⁶,²¹]docosa-1(22),2(11),3,5,7,9,16,18,20-nonaene-13,13-bis(ylium)-12,14-diide
Test material form:
solid: nanoform
Details on test material:
Test materials used in this dossier are all considered to fall under the definition of nano-materials according to the European Commission Recommendation 2011/696/EU as the synthesis and manufacturing of this pigment always yields particulate material with a fine particle size distribution.

Data gathering

Instruments:
TEM - EM910 from Zeiss, e-beam acceleration voltage: 100 keV
Calibration:
no data
Reproducibility:
no data

Results and discussion

Shape description
Key result
Shape:
spherical
Remarks on result:
other: The material is assigned to the “spheroidal” shape category
Aspect ratio
Key result
x Dimension:
1.5
St. dev.:
0.4
y Dimension:
1
Remarks on result:
other: median (D50)

Applicant's summary and conclusion

Conclusions:
- The particles have a median aspect ratio of 1,5:1.
- The shape is “spherical”. The test substance is assigned to the “spheroidal” shape category.
- The median (D50) of the particle size is 85 nm. The material is therefore classified as “nano” according to the definition of nanomaterial 2011/696/EU.