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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:
21 July 2010 to 20 January 2011
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: GLP study conducted in accordance with an internationally recognised method
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions)
GLP compliance:
yes (incl. QA statement)
Type of method:
other: Sieving and image analysis (microscopy)
Type of distribution:
mass based distribution
Percentile:
D50
Remarks on result:
other: Migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.

Particle size

% Mass

(µm)

Test 1

Test 2

Test 3

Test 4

Test 5

Test 6

Mean

 

105 - 130

60.0 - 105

30.0 - 60.0

10.4 - 30.0

0.5 - 10.4

 

39.3

27.5

18.6

13.9

0.7

 

25.0

36.8

23.8

13.5

0.9

 

31.1

44.8

15.9

7.6

0.5

 

19.7

46.5

21.0

11.9

0.8

 

18.2

50.4

22.7

7.8

0.9

 

8.4

56.5

26.2

8.5

0.4

 

23.6

43.8

21.4

10.5

0.7
Conclusions:
The results indicated that 0.7% w/w of MPP was smaller than 10 µm.

Description of key information

The results indicate that 0.7% w/w of MPP was smaller than 10 µm.

Additional information

The particle size distribution was determined by a combination of sieving and image analysis with combination of the results to produce a mass distribution. The results indicate that only a very small proportion of MPP is of respirable size (0.7% <10µm) and it can be expected not to present an inhalation hazard.