Propanenitrile, 3-[[4-[[5,6(or 6,7)-dichloro-2-benzothiazolyl]azo]phenyl]ethylamino]-

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

Study period:

September 17, 2021

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Version / remarks:

2009

Deviations:

no

GLP compliance:

yes (incl. QA statement)

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

4 µm

St. dev.:

0.65

Key result

Percentile:

D50

Mean:

143 µm

St. dev.:

4.85

Key result

Percentile:

D90

Mean:

495 µm

St. dev.:

11.85

Individual results:

The test item consisted of non-transparent particles which appeared irregular shaped.

The particles were introduced to the analyser beam by the dry powder feeder by direct spraying through the measurement area. The powder was loosened by an integrated vibrator. The particles were dispersed and fed to the optical system by pressurized dry air (1.5 bar_g). After passing the analyser beam the sample was collected in a vacuum cleaner.

After adjusting the laser, measuring the background and adjusting the correct particle concentration (obscuration) the measurement was started. The control software automatically performed three measurements. The average of these three measurements was given as result. Two test series of three measurements each were performed. The measurement time was 8 s.

Median values were calculated from unrounded values.

The median particle size L₅₀ (D (v, 0.5): 50 % of particle volume with lower particle diameter) deduced from these distributions were:

1^st test series: L₅₀ = 138.1 µm

2^nd test series: L₅₀ = 147.8 µm

The average of the median particle size L₅₀ was:

L₅₀ = 143 µm

The particle size L₁₀ (D (v, 0.1): 10 % of particle volume with lower particle diameter) deduced from these distributions were:

1^st test series: L₁₀ = 3.4 µm

2^nd test series: L₁₀ = 4.7 µm

The average of the particle size L₁₀ was:

L₁₀ = 4.0 µm

The particle size L₉₀ (D (v, 0.9): 90 % of particle volume with lower particle diameter) deduced from these distributions were:

1^st test series: L₉₀ = 507.2 µm

2^nd test series: L₉₀ = 483.5 µm

The average of the particle size L₉₀ was:

L₉₀ = 495 µm

Maxima were observed at approximately 4 µm, 100 µm and 500 µm.

Conclusions:

The median particle size L50 of the test item deduced from the particle size distributions was 143 µm.

Executive summary:

The particle size distribution of the test item Disperse Red 153 was measured with laser diffraction.

The median particle size L₅₀ of the test item deduced from the particle size distributions was 143 µm.

The particle size L₁₀ of the test item deduced from the particle size distributions was 4.0 µm.

The particle size L₉₀ of the test item deduced from the particle size distributions was 495 µm.

Description of key information

The particle size distribution of the test item Disperse Red 153 was measured with laser diffraction.

The median particle size L₅₀ of the test item deduced from the particle size distributions was 143 µm.

The particle size L₁₀ of the test item deduced from the particle size distributions was 4.0 µm.

The particle size L₉₀ of the test item deduced from the particle size distributions was 495 µm.