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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:
01 August 2017 to 10 August 2017
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to
Guideline:
other: CIPAC MT 170 Dry Sieve analysis of water dispersible granules
Deviations:
no
Qualifier:
according to
Guideline:
other: CIPAC MT 169 Tap Density of Water Disperse Granules
Deviations:
no
Qualifier:
according to
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Deviations:
no
GLP compliance:
yes (incl. certificate)
Type of method:
sieving
Type of particle tested:
agglomerate
Type of distribution:
mass based distribution
No.:
#1
Size:
> 600 µm
Distribution:
< 10 %
No.:
#2
Size:
210 µm
Distribution:
32.98 %
No.:
#3
Size:
120 µm
Distribution:
38.5 %
No.:
#4
Size:
90 µm
Distribution:
13.87 %
No.:
#5
Size:
37 µm
Distribution:
13.21 %

Tap Density Determination (CIPAC MT 169).

The tap density of the test item was found to be 0.287 g/ml.

Details are summarized in Table 1.

Table 1. Tap density determination

Replicate Test item weight (g) Volume after tapping (mL) Tap density (g/mL)
1 8.5593 30 0.2853
2 9.5082 33 0.2881
mean 0.2867

Sieving (CIPAC MT 170)

The particle size distribution of the test item was found to be [37 μm; 210 μm]. Details are summarized in Table 2.

Table 2. Sieve test 

Number of sieves (n):

8

Sample mass (calculated):

46.0 g

Samples mass (measured):

47.8188 / 46.1227 g

Sieve

% Particles retained R1

 % Particles retained R2

Mean

Size (μm)

1000

0.05

0.02

0.03

710

0.25

0.27

0.26

600

0.06

0.27

0.16

210

29.60

36.37

32.98

120

44.19

32.83

38.51

90

11.21

16.52

13.87

37

13.61

12.80

13.21

25

0.65

0.65

0.65

Conclusions:
The tap density of the test item was found to be 286.7 kg/m3. The particle size distribution of the test item was found to be [37µm; 210 µm].
Executive summary:

The purpose of the study was the determination of the particle size distribution of the test item. The study was performed in accordance with CIPAC MT 170, Dry Sieve Analysis of Water Dispersible Granules using also CIPAC MT 169, Tap Density of Water Disperse Granules. In conclusion the tap density of the test item was found to be 0.287 g/mL and the particle size distribution of the test item was found to be [37 μm; 210 μm].

Description of key information

The tap density of the test item was determined according to CIPAC MT 169.

The particle size distribution of the test item was found to be [37 μm; 210 μm].

Additional information

The tap density of the test item was determined according to CIPAC MT 169. The sample mass for the sieve test was calculated and the machine sieving was carried out using the following test sieves 1000 µm, 710 µm, 600 µm, 210 µm, 120 µm, 90 µm, 37 µm and 25 µm. The particle size distribution of the test item was found to be [37 μm; 210 μm].