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Particle size distribution (Granulometry)

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Endpoint:
particle size distribution (granulometry)
Type of information:
experimental study
Adequacy of study:
key study
Study period:
03 July 2009 - 01 December 2009 -final repot 01 June 2010
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
other: Test method developed in testing laboratory and accuracy ratified against all standard tests.
Qualifier:
according to guideline
Guideline:
other: Standard Operating Procedure 060118.01 of Fraunhofer ITEM
Principles of method if other than guideline:
The standard procedure at Fraunhofer ITEM (direct method) was compared for some fibre samples to the line intercept method in previous studies. The resulting length weighted diameter distribution was not different between both methods
GLP compliance:
yes
Type of method:
determination of fibre length and diameter distributions
Type of distribution:
counted distribution
Percentile:
D50
Remarks on result:
other: Not a relevant descriptor for fibres as length contributes to mass but barely to aerodynamic diameter(migrated from fields under 'Mass median diameter' as D50 percentile. No source field for Standard deviation.)

Table 1 Size distribution of fibres (Weighing by length, mean values)

Sample

Fibre diameter [µm]

Arithmetic

Geometric

Mean

Std

Mean

Std

Sample B

2.98

2.67

2.08

2.47

Sample C

2.78

2.91

1.93

2.43

Sample F

2.25

2.09

1.49

2.68

Sample G

3.88

3.15

2.75

2.52

Sample H

2.57

1.95

1.85

2.46

Sample I

1.57

1.48

1.08

2.45

 

Table 2 Size distribution of fibres (Weighing by length, percentile values)

 

Sample

n

Fibre diameter [µm]

1%<

10%<

50%<

90%<

Sample B

513

0.18

0.60

2.35

5.84

Sample C

512

0.21

0.50

2.13

5.38

Sample F

509

0.11

0.38

1.72

4.76

Sample G

506

0.20

0.71

3.21

7.36

Sample H

519

0.15

0.44

2.12

5.35

Sample I

526

0.11

0.30

1.13

3.05
Conclusions:
The products contain a very low proportion of nano particles/fibres . The arithmetic mean diameter is 1.5-4.0 microns
Executive summary:

The material as sold consists of entangled fibres forming a wool. The length of these fibres is indeterminate and the product can be described entirely by the fibre diameter distribution, which is provided within this dossier.

Description of key information

The arithmetic mean  of the fibre diameter is >1.5 microns

Additional information

The products contain a very low proportion of nano particles/fibres. The arithmetic mean of the fibre diameter is >1.5 microns