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Particle size distribution (Granulometry)

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Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
October 2009
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Qualifier:
according to
Guideline:
other: ISO 13320-1
Principles of method if other than guideline:
Laser diffraction method - The test was conducted according to the guidance of the apparatus used. A short description is given below:
The dry test substance is dispersed and passes a laser in form of an aerosol. In dependence on the particle size the laser is diffracted. The resulting so called “Fraunhofer” diffraction spectrum is bundled using a converging lens in a multi-element photo detector. In dependence of the particle size distribution a radial symmetric intensity distribution is generated. The measured intensity is analysed by a computer and converted into a particle size distribution.
GLP compliance:
not specified
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Percentile:
D50
Mean:
1.65 µm
Remarks on result:
other: SD not determined.
No.:
#1
Size:
0.69 µm
Distribution:
10 %
No.:
#2
Size:
1.65 µm
Distribution:
50 %
No.:
#3
Size:
3.64 µm
Distribution:
90 %
No.:
#4
Size:
7.5 µm
Distribution:
100 %

The results are shown in graphical and tabular form in the attached background material.

Conclusions:
The median value of particle size is 1.65 µm.
Executive summary:

The granulometric properties of dicyandiamide were analysed with the laser diffraction method according to guideline ISO 13320-1. The particle size distribution was determined using the particle size analysator HELOS KF (H0119) from Sympatec with a Sympatec RODOS dry dispersing unit. The test material was dried via dispersing and run in form of an aerosol fluent through a laser beam. The median value of particle size is 1.65µm.

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
January 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
according to
Guideline:
other: ISO 13320-1
Principles of method if other than guideline:
Laser diffraction method
The dry test substance is dispersed and passes a laser in form of an aerosol. In dependence on the particle size the laser is diffracted. The resulting so called “Fraunhofer” diffraction spectrum is bundled using a converging lens in a multi-element photo detector. In dependence of the particle size distribution a radial symmetric intensity distribution is generated. The measured intensity is analysed by a computer and converted into a particle size distribution.
GLP compliance:
not specified
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Key result
Percentile:
D50
Mean:
1.65 µm
Remarks on result:
other: SD not reported.

The results are shown in graphical and tabular form in the attached background material.

Conclusions:
The median value of particle size is 1.65 µm.
Executive summary:

The study was conducted according to national standard method ISO 13320 -1. An appropriate apparatus was used, the HELOS KF (H0119) from Sympatec with a Sympatec RODOS dry dispersing unit. The median value of particle size of Dyhard 100 SF has been determined to be 1,65µm. The particle sizes are within a range of 0,69µm for x10 and 3.64µm for x90 with the largest value being 7.5µm for x100.

Description of key information

The particle sizes were determined with the laser diffraction method (apparatus HELOS KF H0119) according

to guideline ISO 13320-1.

Additional information

The granulometric properties of dicyandiamide were analysed with the laser diffraction method according to guideline ISO 13320-1. The method is described in a separate document. The particle size distribution was determined using the particle size analysator HELOS KF (H0119) from Sympatec with a Sympatec RODOS dry dispersing unit. The test material was dried via dispersing and run in form of an aerosol fluent through a laser beam. The median value of particle size is 1.65µm.