Registration Dossier

Physical & Chemical properties

Particle size distribution (Granulometry)

Currently viewing:

Administrative data

Link to relevant study record(s)

Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
September 2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: The well conducted study was performed according to DRAFT EUR 20268 ENGuidance and under the Internal Management system. Certificate of analysis included in the report.
Qualifier:
according to guideline
Guideline:
other: ISO 2591-1, Test sieving – Part 1Methods using test sieves of woven wire cloth and perforated metal plate, December 1988
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: ISO3310-1, Test sieves – Technical requirements and testing – Part 1: Test sieves of metal wire cloth, July 1990
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: SMA721.02, Determination of the particle size distribution of powders and granular products
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: SMA743.02, Distribution of powders and granulated products in representative portions, August 1993
Deviations:
no
Qualifier:
according to guideline
Guideline:
other: DRAFT EUR 20268 ENGuidance document on the determination of particle size distribution, fiber length and diameter distribution of chemical substances, 2002
Deviations:
no
Principles of method if other than guideline:
SMA is standard method of analysis, intern AkzoNobel.
GLP compliance:
no
Type of method:
sieving
Type of distribution:
volumetric distribution
Percentile:
D50
Remarks on result:
other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.
No.:
#1
Size:
> 100 µm
Distribution:
98.6 %
No.:
#2
Size:
< 100 µm
Distribution:
1.4 %
No.:
#3
Size:
< 10 µm
Distribution:
0.21 %
No.:
#4
Size:
< 5 µm
Distribution:
0.09 %

Light microscopic examinations  

see attachment

This picture shows that in addition to the di-lauroyl peroxide flakes, a small amount of fines are present. The shape of the fines is non-fibrous.

 

Sieving

 

Fraction

Amount   

 

   [g]

  [%] 

 <100 μm

 2.49

 1.4

 >100 μm

 181.94

 98.6

Graphs of the PSD

see attachment

PSD by laser diffraction

 

The PSD of the fraction <100mm is determined by laser light diffraction. Next table presents the results.

 

PSD analysis results

Sample

d10

d50

d90

 

[µm]

[µm]

[µm]

1

6.94

28.74

85.62

2

7.12

29.90

92.16

3

6.95

29.01

85.84

Average

7.0

29

88

St. Dev.

0.1

0.6

3.7

 

  From these data it is calculated that from the fraction < 100 µm 15.4% is < 10 µm and 6.7% is < 5 µm. For the whole product it means:

  • < 10 µm: 0.21%
  • < 5 µm: 0.09%
Conclusions:
The particle size distribution (PSD) of dilauroyl peroxide is: < 100 µm 1.4 %, < 10 µm 0.21% and < 5 µm 0.09%. The shape of the fines is non-fibrous.
Executive summary:

Light microscopic examination revealed that the dilauryol peroxide sample contained a small amount of fines.

The shape of the fines is non-fibrous.

This observation is confirmed by sieving the sample over a 100µm sieve. A small amount of fines were sieved off (1.4 m/m%).

The characteristics of the PSD of the fraction < 100 µm are:

Characteristics of the PSD

d10

[µm]

7.0

d50

[µm]

29

d90

[µm]

88

From the whole product 0.21% is < 10 µm and 0.09% is < 5 µm.

The particle size distribution (PSD) of di-lauroyl peroxide is: < 100 µm 1.4 %, < 10 µm 0.21% and < 5 µm 0.09%.

Description of key information

The particle size distribution (PSD) of di-lauroyl peroxide is: < 100 µm 1.4 %, < 10 µm 0.21% and < 5 µm 0.09%. The shape of the fines is non-fibrous.

Additional information

Light microscopic examination revealed that the di-lauroyl peroxide sample contained a small amount of fines.

This observation is confirmed by sieving the sample over a 100 μm sieve. A small amount of fines were sieved off (1.4 m/m%).

The PSD of the fraction <100µm is determined by laser light diffraction.