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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:
23 January 2013
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Qualifier:
according to guideline
Guideline:
OECD Guideline 110 (Particle Size Distribution / Fibre Length and Diameter Distributions - Method A: Particle Size Distribution (effective hydrodynamic radius)
Qualifier:
according to guideline
Guideline:
ISO 13320 (Particle size analysis - Laser diffraction methods)
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 187 (2006): Particle Size Analysis by Laser Diffraction
Principles of method if other than guideline:
Not applicable
GLP compliance:
yes (incl. QA statement)
Remarks:
25 August 2010
Type of method:
Laser scattering/diffraction
Type of particle tested:
primary particle
Type of distribution:
volumetric distribution
Specific details on test material used for the study:
- Appearance: White powder
- Storage condition: Ambient temperature, protected from light, dry.
Percentile:
D10
Mean:
280 µm
Remarks on result:
other: no data on SD
Key result
Percentile:
D50
Mean:
534 µm
Remarks on result:
other: no data on SD
Percentile:
D90
Mean:
923 µm
Remarks on result:
other: no data on SD
No.:
#1
Size:
< 37 µm
Distribution:
0 %
No.:
#2
Size:
< 117 µm
Distribution:
< 0.36 %
No.:
#3
Size:
< 541 µm
Distribution:
ca. 15 %

Two test series of 3 measurements each were performed with the test item.

Test series 1:

L10: 285.33 µm

L50: 539.52 µm (Median diameter)

L90: 931 .62 µm

 

Test series 2:

L10: 274.52 µm

L50: 528.55 µm (Median diameter)

L90: 913.76 µm

 

Average

L10: 279.93 µm

L50: 534.04 µm (Median diameter)

L90: 922.69 µm

 

The test substance has a median particle size L50= 534 µm, which was determined by laser diffraction measurement.

The graphical results show a Gaussian-type distribution.

Conclusions:
The substance contains almost no inhable particle. Limited potential for dust explosion.
Executive summary:

The particle size of the test substance was determined under GLP according to OECD Guideline 110, by laser diffraction measurement.

 

Two test series of 3 measurements each were performed with the test item and mean results were retained.

 

The test substance has a median particle size of L50 = 534 µm.

With regard to inhalation potential, 99.6% of particles are larger than 100 μm, and no particles are smaller than 37 μm, therefore can't reach the thoracic fraction.

Fine particles relevant to dust explosion hazard (<541 μm) are less than 16%.

Description of key information

The substance contains almost no inhalable particle. Limited potential for dust explosion.

Median diameter (L50) = 534 μm

Inhalable fraction (<117 μm) < 0.36%

Dust particles (<541 μm) ca 15%

Additional information

A reliable experimental study, conducted according to a recognized OECD/CIPAC/ISO guideline, is available. Despite (minor) restrictions due to sample preparation, it is considered as a key study.