N-[4-(2',7'-ditert-butyl-9,9'-spirobi[fluorene]-2-yl)phenyl]-9,9-dimethyl-N-(2-phenylphenyl)fluoren-2-amine

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:

31.10.-04.11.2019

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

guideline study

Qualifier:

according to guideline

Guideline:

OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Version / remarks:

2009

GLP compliance:

no

Type of method:

Laser scattering/diffraction

Type of particle tested:

agglomerate

Type of distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

>= 19.5 - <= 27.5 µm

Remarks on result:

other: St. dev. not determined

Key result

Percentile:

D50

Mean:

>= 151 - <= 243 µm

Remarks on result:

other: st. dev. not determined.

Key result

Percentile:

D90

Mean:

>= 641 - <= 752 µm

Remarks on result:

other: st. dev. not determined.

The test item consisted of crystalline particles with different sizes and shapes. The test item was tested as a liquid dispersion in demineralized water (with 1 % detergent). Before the measurement the test item was mixed with demineralized water (with 1 % detergent) and homogenised. This homogenised dispersion was fed to the sample unit, which was filled with demineralized water (with 1 % detergent). Subsequently the diluted dispersion was pumped to the optical system. After passing the analyser beam the sample was pumped back into the small volume sample dispersion unit.

After adjusting the laser, measuring the background (demineralized water with 1 % detergent) 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 12 s.

For each test series fractions (left axis of the ordinate) and the siftings (right axis of the ordinate) are presented in percent by volume as a function of the particle size. Median values were calculated from unrounded values.

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

1sttest series: L50=243 μm

2ndtest series: L50=151 μm

 

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

1sttest series: L10=27.5 μm

2ndtest series: L10=19.5 μm

 

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

1sttest series: L90=752 μm

2ndtest series: L90=641 μm

 

For the present test item the resulting L10 , L50 and L90 values of the two test series of the particle size distribution fluctuated significantly. Therefore, a calculation of the mean values was scientifically not

reasonable.

Conclusions:

The particle size L50 of the test item deduced from the particle size distributions was ≥151 ≤243 µm.

Executive summary:

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was ≥151 ≤243 µm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was ≥151 ≤243 µm.

Additional information

The determination of the particle size distribution by laser diffraction of the test item was performed according to the OECD Guideline 110 by laser diffraction. The median particle size L50 of the test item deduced from the particle size distributions was ≥151 ≤243 µm.