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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:
28 September 2017 to 12 October 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
other: CIPMAC MT 187
Deviations:
yes
Remarks:
Please refer to the field "Principles of method if other than guideline" for further information
Principles of method if other than guideline:
Deviation No. 1: For particle size distribution test, the large agglomerates of the test material were gently broken down with a mortar and a pestle before performing the test.
Deviation No. 2: For Particle size distribution test, the loss of mass was 5.2%.
These deviations were not considered to have affected the quality or the interpretation of the results obtained.
GLP compliance:
no
Remarks:
The test was not performed following the GLP principles.
Type of method:
Laser scattering/diffraction
Type of particle tested:
other: Not specified
Type of distribution:
mass based distribution
Remarks on result:
other: Mean diameter in volume was 28.9 µm; the mean diameter in surface was 4.47 µm
Percentile:
D10
Mean:
1.52 µm
Remarks on result:
other: St. dev. not specified.
Percentile:
D50
Mean:
19 µm
Remarks on result:
other: St. dev. not specified.
Percentile:
D90
Mean:
68.4 µm
Remarks on result:
other: St. dev. not specified.
No.:
#1
Size:
>= 0.243 - <= 400 µm
Remarks on result:
other: Distribution not reported

The particle size distribution of the test material was found to range approximately 0.243 μm to 400 μm.

The following values were obtained for the test material:

- The mean diameter in volume was 28.9 μm.

- The mean diameter in surface was 4.47 μm.

- The particle size D(0.1) was 1.52 μm.

- The particle size D(0.5) was 19.0 μm.

- The particle size D(0.9) was 68.4 μm.

Conclusions:
Under the conditions of the test, the particle size distribution of the test material was found to range approximately 0.243 μm to 400 μm.
Executive summary:

The Particle Size Distribution Analyser uses the Fraunhoffer scattering theory. A representative part of the test material was added to 20 mL of demineralised water. With a continuous stirring, a suspension was created to achieve the analysis. The test material was considered to be homogeneous; therefore the particle size distribution given in the report was obtained from only one analysis of the sample.

 

The particle size distribution of the test item was found to range approximately 0.243 μm to 400 μm.

The following values were obtained for the test item:

- The mean diameter in volume was 28.9 μm.

- The mean diameter in surface was 4.47 μm.

- The particle sizeD(0.1) was 1.52 μm.

- The particle sizeD(0.5) was 19.0 μm.

- The particle sizeD(0.9) was 68.4 μm.

Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
28 September 2017 to 12 October 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Reason / purpose:
reference to same study
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
sieving
Type of particle tested:
agglomerate
Type of distribution:
volumetric distribution
No.:
#1
Size:
< 25 µm
Distribution:
10.4 %
No.:
#2
Size:
>= 25 - <= 250 µm
Distribution:
80.4 %
No.:
#3
Size:
<= 1 mm
Distribution:
99.6 %

Preliminary Sieving

Ambient humidity: From 39% to 45%

Temperature: From 20.5°C to 22.3°C

Mass of test item used: 19.48 g

 

About 30 g of the test material was sampled and the agglomeates were gently broken down with a mortar and pestle.

 

Test sieve

Mass of residue(g)

Percentage of residue(%)

Cumulated undersized particles (%)

Time of mechanical sieving(min)

Time of manual sieving(min)

4.0 mm

0.00

0.0

100.0

30

1

1.0 mm

0.07

0.4

99.6

30

5

Receiver pan

19.22

99.6

0.0

30

/

 

The loss of mass was 1.0%.

The particles size was visibly lower than 25 mm. So, the sieve of 25 mm was not used.

 

The quantity of the particles between the receiver pan and the sieve of 1 mm is higher than 20% of the charge. So, the principal sieving was made with sieves with mesh sizes lower than 1 mm.

 

Principal Sieving

Ambient humidity: From 39% to 45%

Temperature: From 20.5°C to 22.3°C

Mass of test item used: 19.22 g

 

Test sieve

Mass of residue(g)

Percentage of residue(%)

Cumulated undersized particles(%)

Time of mechanical sieving(min)

Time of manual sieving(min)

710 µm

0.04

0.2

99.4

30

3

500 µm

0.07

0.4

99.0

30

4

355 µm

0.21

1.1

97.9

30

4

250 µm

1.30

7.1

90.8

30

9

180 µm

1.59

8.7

82.1

30

9

125 µm

1.29

7.1

75.0

30

6

90 µm

1.72

9.4

65.6

30

7

63 µm

1.92

10.5

55.1

30

8

45 µm

1.83

10.0

45.1

30

11

32 µm

5.33

29.1

16.0

30

11

25 µm

1.02

5.6

10.4

30

13

Receiver pan

1.91

10.4

0.0

30

/

 

The loss of mass was 5.2%. 

Conclusions:
After the preliminary test, it was shown that the majority of the particles (99.6%) was between the receiver pan and 1 mm. So, the principal sieving was made lower than 1 mm.
After the main test, it was shown that the majority of the particles (80.4%) was between 25 µm and 250 µm and 10.4% lower than 25 µm.
Executive summary:

The particle size distribution of the test material was assessed according to OECD Test Guideline 110 using a seive method.

If a significant amount of particles is obtained above 1 mm (i.e. > 20% of the test sample), the fraction between 1 mm and 4 mm is sieved using sieves of 2.8 mm, 2.0 mm and 1.4 mm. The sieving is performed to apply a horizontal movement 120 times per minute with amplitude of about 70 mm. Three times per minute, a circular movement is applied.

If a significant amount of particles is obtained under 1 mm (i.e. > 20% of the test sample), the fraction, between the receiver pan and 1 mm, is sieved using sieves of 710 µm, 500 µm, 355 µm, 250 µm, 180 µm, 125 µm, 90 µm, 63 µm, 45 µm, 32 µm and 25 µm. The sieve is tapped 120 times per minute with an inclination of about 20°. Four times per minute, the sieve is put in a horizontal position, turned at 90° and a shock is applied on the sieve.

A mechanical sieving is used with a maximal duration of 30 minutes. The sieves are weighed again. Then, a manual sieving is carried out and weighings are made at each minute of sieving. The end-point of the sieving process may be when the quantity passing through the sieve is less than 0.1% of the charge between two sievings.

After the preliminary test, it was shown that the majority of the particles (99.6%) was between the receiver pan and 1 mm. So,the principal sieving was made lower than 1 mm.

After the main test, it was shown that the majority of the particles (80.4%) was between 25 µm and 250 µm and 10.4% lower than 25 µm.

Description of key information

After the preliminary test, it was shown that the majority of the particles (99.6%) were between the receiver pan and 1 mm. So, the principal sieving was made lower than 1 mm.

After the main test, it was shown that the majority of the particles (80.4%) were between 25 µm and 250 µm and 10.4% lower than 25 µm using the sieve method.

The particle size distribution of the test material was found to range approximately 0.243 μm to 400 μm using the laser diffraction method.

Additional information

The particle size distribution of the test material was assessed according to OECD Test Guideline 110 using a seive method.

If a significant amount of particles is obtained above 1 mm (i.e. > 20% of the test sample), the fraction between 1 mm and 4 mm is sieved using sieves of 2.8 mm, 2.0 mm and 1.4 mm. The sieving is performed to apply a horizontal movement 120 times per minute with amplitude of about 70 mm. Three times per minute, a circular movement is applied.

If a significant amount of particles is obtained under 1 mm (i.e. > 20% of the test sample), the fraction, between the receiver pan and 1 mm, is sieved using sieves of 710 µm, 500 µm, 355 µm, 250 µm, 180 µm, 125 µm, 90 µm, 63 µm, 45 µm, 32 µm and 25 µm. The sieve is tapped 120 times per minute with an inclination of about 20°. Four times per minute, the sieve is put in a horizontal position, turned at 90° and a shock is applied on the sieve.

A mechanical sieving is used with a maximal duration of 30 minutes. The sieves are weighed again. Then, a manual sieving is carried out and weighings are made at each minute of sieving. The end-point of the sieving process may be when the quantity passing through the sieve is less than 0.1% of the charge between two sievings.

After the preliminary test, it was shown that the majority of the particles (99.6%) was between the receiver pan and 1 mm.So,the principal sieving was made lower than 1 mm.

After the main test, it was shown that the majority of the particles (80.4%) was between 25 µm and 250 µm and 10.4% lower than 25 µm.

The particle size distribution was also assessed using the laser diffraction method. The Particle Size Distribution Analyser uses the Fraunhoffer scattering theory. A representative part of the test material was added to 20 mL of demineralised water. With a continuous stirring, a suspension was created to achieve the analysis. The test material was considered to be homogeneous; therefore the particle size distribution given in the report was obtained from only one analysis of the sample.

 

The particle size distribution of the test item was found to range approximately 0.243 μm to 400 μm.

- The mean diameter in volume was 28.9 μm.

- The mean diameter in surface was 4.47 μm.

- The particle sizeD(0.1) was 1.52 μm.

- The particle sizeD(0.5) was 19.0 μm.

- The particle sizeD(0.9) was 68.4 μm.