N-(2,3-dihydro-2-oxo-1H-benzimidazol-5-yl)-2-[(2-methoxyphenyl)azo]-3-oxobutyramide

Particle size distribution (Granulometry)

Link to relevant study record(s)

Reference

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.

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Type of method:

Laser scattering/diffraction

Type of distribution:

volumetric distribution

Percentile:

D10

Mean:

0.46 µm

St. dev.:

0.05

Percentile:

D50

Mean:

3.05 µm

St. dev.:

0.4

Percentile:

D90

Mean:

43.59 µm

St. dev.:

11.8

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 3.05 µm.

Executive summary:

The particle size of the test substance was measured by Malvern laser diffraction (volumetric distribution). The test substance has a median particle size of 3.05 µm.

Description of key information

D50 (laser diffraction): 3.05 µm