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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:
05.10.2009
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with generally accepted scientific standards and described in sufficient detail
Qualifier:
according to
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Version / remarks:
Part 1: General principles, First edition 1999-11-01
Deviations:
no
GLP compliance:
yes
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Key result
Percentile:
D50
Mean:
17.43 µm
St. dev.:
0.22
Percentile:
D90
Mean:
< 29.14 µm
St. dev.:
0.36
Percentile:
D10
Mean:
< 10.12 µm
St. dev.:
0.24

Table No. 1 Results of determination of particle size distribution

Determination

Median

(µm)

Diameter on Cumulative 90%

(µm)

Diameter on Cumulative 10%

(µm)

Span

(-)

1

17.43

29.14

10.12

1.09

2

17.83

29.68

10.44

1.08

3

17.60

29.84

10.15

1.12

4

17.28

29.18

9.75

1.12

5

17.22

28.90

9.91

1.10

6

17.56

29.16

10.26

1.08

Average

17.49

29.32

10.10

1.10

Standard deviation

0.22

0.36

0.24

0.02

Extended uncertainty

0.45

0.72

0.49

-

The value nearest to average is used as final result of the test. That is the 1stmeasurement.

Detailed results of this measurement are stated at the Appendix 1.

Criteria of quality

The test satisfied quality criteria as follows:

The individual results of median from single testing should not vary more than 10 % from the average. For our measurements the calculated critical range is 15.74 to 19.24 µm.

We performed 6 measurements and the individual values fall within the range of quality criterion (actual range is 17.22 to 17.83).

The criterion of quality was met.

Conclusions:
See Executive Summary
Executive summary:

The determination of the particle size distribution of the test substance, Semi Dry Absorption (SDA) Product, was determined. The laser diffraction method was used.

Test was performed according to the standard ISO 13320-1 Particle size analysis – Laser diffraction methods – Part 1: General principles, First edition 1999-11-01.

The recommendations of Guidance Document on the Determination of Particle Size Distribution, Fibre Length and Diameter Distribution of Chemical Substances, EUR 20268 EN (2002) were considered.

Particle size distribution of the test substance Semi Dry Absorption (SDA) Product, is characterized by the following table:

Determination

Median

(µm)

Diameter on Cumulative 90%

(µm)

Diameter on Cumulative 10%

(µm)

Span

(-)

Final result

17.43

29.14

10.12

1.09

Extended uncertainty

0.45

0.72

0.49

-

Description of key information

The particle size distribution of the test substance was determined according to the standard ISO 13320-1 Particle size analysis – Laser diffraction methods.

Median: 17.43 um (ext. uncertainty 0.45)

Additional information