2-Dibenzofuranyl-1-4,6-diphenyl-[1,3,5]-triazine

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:

23.-24.10.2019

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:

ca. 1.3 µm

Remarks on result:

other: St. dev. not determined

Key result

Percentile:

D50

Mean:

ca. 4.9 µm

Remarks on result:

other: st. dev. not determined.

Key result

Percentile:

D90

Mean:

ca. 16.4 µm

Remarks on result:

other: st. dev. not determined.

The test item was a fine white powder with chunks. Under the microscope needle-shaped crystalline particles were observed. The fluffy needle-shaped particles of the test item tended to agglomerate. The test item was sieved with a mesh size of 1000 μm. 28.5 % (w/w) of the test item passed the sieveand only this fraction was measured with laser diffraction. 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. 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 or particle mass with lower particle diameter) deduced from these distributions were:

1st test series: L50= 4.8 μm

2nd test series: L50= 5.1 μm

The average of the median particle size L50was: L50= 4.9 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= 1.3 μm

2nd test series: L10= 1.4 μm

The average of the particle size L10was: L10= 1.3 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= 14.9 μm

2nd test series: L90= 17.9 μm

The average of the particle size L90was: L90= 16.4 μm

 

The maximum was observed at approximately 5 μm. Additionally, a shoulder was observed at approximately 0.5 μm. In the second measurement an additional maximum was observed at approximately 250 μm.

Conclusions:

The median particle size L50 of the test item deduced from the particle size distributions was 4.9 µm.

Executive summary:

The median particle size L50 of the test item deduced from the particle size distributions was 4.9 µm.

Description of key information

The median particle size L50 of the test item deduced from the particle size distributions was 4.9 µm.