1,3-diphenylurea

Particle size distribution (Granulometry)

Administrative data

Endpoint:

particle size distribution (granulometry)

Type of information:

experimental study

Adequacy of study:

key study

Study period:

2017-03-21 to 2017-03-22

Reliability:

1 (reliable without restriction)

Rationale for reliability incl. deficiencies:

test procedure in accordance with generally accepted scientific standards and described in sufficient detail

Data source

Reference

Reference Type:

study report

Title:

Unnamed

Year:

2017

Report date:

2017

Materials and methods

Test guideline

Test guideline 1

Qualifier:

according to guideline

Guideline:

ISO 13320 (Particle size analysis - Laser diffraction methods)

Test guideline 2

Qualifier:

according to guideline

Guideline:

other:

Version / remarks:

CIPAC MT 187

Principles of method if other than guideline:

The analysis was conducted initially using a visual microscope and was then undertaken more formally using a Laser Diffraction Particle Size Analyser. The sample was observed under 3 conditions: Direct observation, under a microscope with 32 x magnification, under a microscope with 400 x magnification. The physical characteristics of the material were recorded, noting such items as shape and size distribution. Following this the Malvern Mastersizer 2000 Laser Diffraction Analyser was used. Five runs of the method were conducted to ensure repeatability of results.

GLP compliance:

yes (incl. QA statement)

Type of method:

Laser scattering/diffraction

Type of particle tested:

primary particle

Type of distribution:

volumetric distribution

Test material

Test material information

Constituent 1

Reference substance name:

1,3-diphenylurea

EC Number:

203-003-7

EC Name:

1,3-diphenylurea

Cas Number:

102-07-8

Molecular formula:

C13H12N2O

IUPAC Name:

1,3-diphenylurea

Test material form:

solid

Specific details on test material used for the study:

SOURCE OF TEST MATERIAL
White or off-white solid
Batch number: 506001
Purity / composition: 98 %
Relative density: 1.25 (supplied by Charles River Laboratories)
Chemical name (IUPAC), synonym or trade name: Diphenylurea

STABILITY AND STORAGE CONDITIONS OF TEST MATERIAL
Test item storage: At room temperature
Stable under storage conditions until: 24 March 2018 (retest date)

Results and discussion

Mass median aerodynamic diameter:

17.088 µm

Geometric standard deviation:

0.007

Remarks on result:

other: 30.04% volume of sample is seen to be < 10 um

Particle size

Particle size 1

Percentile:

D10

Mean:

< 5.007 µm

St. dev.:

0.042

Remarks on result:

other: % STDVP 0.8

Particle size 2

Percentile:

D50

Mean:

< 15.284 µm

St. dev.:

0.103

Remarks on result:

other: % STDVP 0.7

Particle size 3

Percentile:

D90

Mean:

< 39.256 µm

St. dev.:

0.423

Remarks on result:

other: % STDVP 1.1

Any other information on results incl. tables

Standard visual observation: Sample observed to be a fine, off-white powder which formed some clusters.

Observation at 32 x magnification: The particles appeared to be irregular shaped crystals. The smallest individual particle size was approximately 3 μm and the largest individual size was approximately 61 μm.

Observation at 400 x magnification: The sample was observed to be made up of single crystalline particles.

Applicant's summary and conclusion

Conclusions:

The mass median aerodynamic diameter was determined to be 17.088 um.