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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

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Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
August 2011
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
according to guideline
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:
no
Type of method:
Laser scattering/diffraction
Type of distribution:
volumetric distribution
Key result
Percentile:
D50
Mean:
ca. 482.96 µm
St. dev.:
95
No.:
#1
Size:
170.28 µm
Distribution:
10 %
No.:
#2
Size:
482.96 µm
Distribution:
50 %
No.:
#3
Size:
808.65 µm
Distribution:
90 %
No.:
#4
Size:
1 230 µm
Distribution:
100 %
Conclusions:
The median value of particle size is 482.96 µm
Executive summary:

The granulometric properties of thiourea 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 482.96 µm.

Description of key information

There is one study available analysing the granulometric properties of the test substance.

The particle sizes were determined with the laser diffraction method (apparatus HELOS KF H0119) according to guideline ISO 13320-1.

The median value of particle size is 482.96µm.

Additional information

The granulometric properties of thiourea were analysed with the laser diffraction method according to guideline ISO 13320 -1. Therefore 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 482.96µm.