4''-Ethyl-2'-fluor-4-propyl-1,1':4',1''-terphenyl

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:

2021-02-19

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)

Version / remarks:

1981

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

GLP compliance:

no

Type of method:

Laser scattering/diffraction

Type of particle tested:

agglomerate

Type of distribution:

volumetric distribution

Key result

Percentile:

D10

Mean:

41.6 µm

Remarks on result:

other: St. dev. not determined

Key result

Percentile:

D50

Mean:

89.1 µm

Remarks on result:

other: st. dev. not determined.

Key result

Percentile:

D90

Mean:

181.6 µm

Remarks on result:

other: st. dev. not determined.

The test item consisted of transparent crystalline particles which appeared partially broken. The test item was sieved with a mesh size of 1000 μm. 94.1 % (w/w) of the test item passed the sieve and only this fraction was measured with laser diffraction.

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 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. 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:

1st test series: L50 = 90.2 μm

2nd test series: L50 = 87.9 μm

The average of the median particle size L50 was: L50 = 89.1 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:

1st test series: L10 = 42.3 μm

2nd test series: L10 = 40.8 μm

The average of the particle size L10 was: L10 = 41.6 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:

1st test series: L90 = 183.6 μm

2nd test series: L90 = 179.5 μm

The average of the particle size L90 was: L90 = 181.6 μm

The maximum was observed at approximately 90 μm. Additionally shoulders were observed at approximately 1 μm and approximately 15 μm.

Conclusions:

The median particle size L50 of the test item deduced from the particle size distributions was 89.1 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 89.1 μm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was 89.1 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. The median particle size L50 of the test item deduced from the particle size distributions was 89.1 μm.