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Diss Factsheets

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
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Justification for type of information:
Performed by manufacturer
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Principles of method if other than guideline:
Sieves of 250 and 60 µm
GLP compliance:
no
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
Specific details on test material used for the study:
Batch number of test material: B-08-3321
Remarks on result:
not determinable
Remarks:
Sample was observed to be hygroscopic
Percentile:
other: 37% w/w
Mean:
> 250 µm
Remarks on result:
other: Method limitations to determine standard deviations
Percentile:
other: 10% w/w
Mean:
> 63 - < 250 µm
Remarks on result:
other: Method limitations to determine standard deviations
Percentile:
other: 52% w/w
Mean:
< 63 µm
Remarks on result:
other: Method limitations to determine standard deviations
Remarks on result:
not determinable because of methodological limitations

The substance was observed to be very hygroscopic. It therefore did not retain a crystalline structure, so, in order to determine the size of the particles, the substance was further dried at 105 °C for 24 hours. The amount of substance used for this particular test was = 60.59 g.

Dry material will not exist outside laboratory conditions and the substance has low dust content.

 

 -      Retained by 250 µm = 37.37%

-      Retained by 63 µm = 10.07%

-      < 63 µm = 52.56%

Conclusions:
The substance was observed to be very hygroscopic. It therefore did not retain a crystalline structure, so, in order to determine the size of the particles, the substance was further dried at 105 °C for 24 hours. The amount of substance used for this particular test was = 60.59 g.
 
 -      Retained by 250 µm = 37.37%
-      Retained by 63 µm = 10.07%
-      < 63 µm = 52.56%
Executive summary:

It was not possible to determine a mass median

Description of key information

The substance was observed to be very hygroscopic. It therefore did not retain a crystalline structure, so, in order to determine the size of the particles, the substance was further dried at 105 °C for 24 hours. The amount of substance used for this particular test was = 60.59 g.

 

 -      Retained by 250 µm = 37.37%

-      Retained by 63 µm = 10.07%

-      < 63 µm = 52.56%

Additional information