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Particle size distribution (Granulometry)

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Reference
Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
30 January 2018 to 01 March 2018
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions) - Method B: Fibre Length and Diameter Distributions
Deviations:
yes
Remarks:
For the particle size distribution test, the test item was gently disaggregated before sieving. This deviation was not considered to have affected the quality or the interpretation of the results obtained.
Qualifier:
according to
Guideline:
other: CIPAC MT 187
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
Laser scattering/diffraction
Remarks:
(and sieving)
Type of particle tested:
primary particle
Key result
Percentile:
D10
Mean:
65 µm
Remarks on result:
other: SD not reported
Key result
Percentile:
D50
Mean:
351 µm
Remarks on result:
other: SD not reported
Key result
Percentile:
D90
Mean:
733 µm
Remarks on result:
other: SD not reported
Size:
< 1 mm
Distribution:
99.6 %
Remarks on result:
other: Sieving method

SIEVING METHOD

Preliminary sieving

- Ambient humidity: From 34.6 to 40.8 %

- Temperature: From 18.8 to 21.4 °C

- Mass of test material used: 50.14 g

Table 1: Preliminary sieving

Test Sieve

Mass of Residue (g)

Percentage of Residue (%)

Cumulated

undersized

particles (%)

Time of

mechanical

sieving (min)

Time of

manual

sieving (min)

4.0mm

0.00

0.0

100.0

30

/

1.0 mm

0.19

0.4

99.6

30

3

Receiver Pan

49.92

99.6

0.0

30

/

 

- The loss of mass was lower than 0.1 %. The particles size was visibly lower than 4 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 34.6 to 40.8 %

- Temperature From: 18.8 to 21.4 °C

- Mass of test material used: 49.92 g

 

Table 2: Principal sieving

Test Sieve (μm)

Mass of Residue (g)

Percentage of Residue (%)

Cumulated

undersized

particles (%)

Time of

mechanical

sieving (min)

Time of

manual

sieving (min)

710

2.50

5.0

94.6

30

6

500

8.64

17.3

77.4

30

9

355

13.84

27.7

49.7

30

9

250

11.98

23.9

25.7

30

4

180

5.78

11.6

14.2

30

3

125

3.01

6.0

8.2

30

3

90

1.84

3.7

4.5

30

4

63

1.17

2.3

2.2

30

2

45

0.62

1.2

0.9

30

2

32

0.24

0.5

0.4

30

2

25

0.11

0.2

0.2

30

2

Receiver Pan

0.11

0.2

0.0

30

/

 

- The loss of mass was 0.2 %.

 

Conclusion

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 was between 63 μm and 710 μm.

LASER DIFFRACTION METHOD

The particle size distribution of the test material was found to range approximately 0.675 μm to 1260 μm.

The following values were obtained for the test material:

- The mean diameter in surface was 78.4 μm.

- The mean diameter in volume was 381 μm.

- The particle size D(0.1) was 65.0 μm.

- The particle size D(0.5) was 351 μm.

- The particle size D(0.9) was 733 μm.

Conclusions:
Under the conditions of this study the particle size distribution of the test material was found to range from approximately 0.675 to 1260 μm.
The following values were obtained for the test material: The mean diameter in surface sv d was 78.4 μm. The mean diameter in volume v d was 381 μm. The particle size D(0.1) was 65.0 μm, the particle size D(0.5) was 351 μm and the particle size D(0.9) was 733 μm.
Executive summary:

The particle size distribution of the test material was investigated in accordance with the standardised guideline OECD 110 and CIPAC MT 187, under GLP conditions. The particle size was investigated using both sieving and laser diffraction.

After the preliminary sieving 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 were between 63 μm and 710 μm.

Using the laser diffraction test the particle size distribution of the test material was found to range from approximately 0.675 to 1260 μm. The following values were obtained for the test material: The mean diameter in surface sv d was 78.4 μm. The mean diameter in volume v d was 381 μm. The particle size D(0.1) was 65.0 μm, the particle size D(0.5) was 351 μm and the particle size D(0.9) was 733 μm.

Description of key information

Under the conditions of this study the particle size distribution of the test material was found to range from approximately 0.675 to 1260 μm.

The following values were obtained for the test material: The mean diameter in surface sv d was 78.4 μm. The mean diameter in volume v d was 381 μm. The particle size D(0.1) was 65.0 μm, the particle size D(0.5) was 351 μm and the particle size D(0.9) was 733 μm.

Additional information

The particle size distribution of the test material was investigated in accordance with the standardised guideline OECD 110 and CIPAC MT 187, under GLP conditions. The particle size was investigated using both sieving and laser diffraction. The study was awarded a reliability score of 1 in accordance with the criteria set forth by Klimisch et al. (1997).

After the preliminary sieving 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 were between 63 μm and 710 μm.

Using the laser diffraction test the particle size distribution of the test material was found to range from approximately 0.675 to 1260 μm. The following values were obtained for the test material: The mean diameter in surface sv d was 78.4 μm. The mean diameter in volume v d was 381 μm. The particle size D(0.1) was 65.0 μm, the particle size D(0.5) was 351 μm and the particle size D(0.9) was 733 μm.