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Physical & Chemical properties

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:
The study was conducted between 13 September 2000 and 7 December 2000.
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
guideline study
Qualifier:
according to guideline
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. QA statement)
Type of method:
other: sieve analysis and image analysis
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
Specific details on test material used for the study:
Identity: ST463.
Appearance: magenta powder
Storage conditions: room temperature
Batch number: 6558
Expiry date: August 2001
Purity: 99.4%
Date received: 1 August 2000
Remarks on result:
not determinable
Remarks on result:
not determinable
No.:
#1
Size:
< 10 µm
Distribution:
7 %
No.:
#2
Size:
>= 10.4 - <= 30 µm
Distribution:
20.4 %
No.:
#3
Size:
>= 30 - <= 60 µm
Distribution:
25.3 %
No.:
#4
Size:
>= 60 - <= 105 µm
Distribution:
22.9 %
No.:
#5
Size:
> 105 µm
Distribution:
24.7 %

Sieve analysis:

The test was performed in duplicate, and the results are summarised below:

Particle size (µm)

% in range by weight

Test 1

Test 2

Test 3

>400

0.5

0.3

0.4

400 – 125

25.3

22.6

24.0

125 – 75

26.9

23.9

25.4

75 – 30

40.9

40.8

40.9

30 – 10

6.3

12.2

9.3

<10

0.0

0.0

0.0

Image analysis:

The reported results were prepared from combined data for both magnifications from each field, at least fifty fields being taken from each slide. The mean projected area data were used to calculate spherical particle volumes in each range, which, when combined with the particle number distribution, gives a volume or mass distribution,

The results are summarised below:

Particle size (µm)

% Mass

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Mean

>125 (sieved)

22.1

21.6

22.5

23.9

22.0

25.9

22.9

>105

0.0

10.5

0.0

0.0

0.0

0.0

1.8

60.0 - 105

14.1

30.3

16.4

17.5

18.8

40.5

22.9

30.0 – 60.0

22.1

24.2

26.4

29.6

29.5

19.9

25.3

10.4 – 30.0

29.2

10.6

29.0

20.9

21.0

11.7

20.4

0.5 – 10.4

12.5

2.7

5.7

8.1

8.7

2.5

6.7
Conclusions:
The results indicate that 7% by mass of the test substance is smaller than 10 µm
Executive summary:

The particle size distribution of the substance was examined using sieve analysis and image analysis. The study was conducted to OECD Method 110.

The results indicate that 7% by mass of the test substance is smaller than 10 µm.

Description of key information

The particle size distribution of the substance was examined using sieve analysis and image analysis. The study was conducted to OECD Method 110.

The results indicate that 7% by mass of the test substance is smaller than 10 µm.

Additional information