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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:
2012-05-31 to 2012-06-07
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
study well documented, meets generally accepted scientific principles, acceptable for assessment
Remarks:
The method is not related to a guideline, but is nevertheless acceptable. The substance is considered to be adequately characterised with its purity. Therefore validation applies, with minor restrictions.
Qualifier:
no guideline followed
Principles of method if other than guideline:
Sieving with column of standard sieves and mechanical shaking.
GLP compliance:
no
Type of method:
sieving
Type of distribution:
mass based distribution
No.:
#1
Size:
1 000 µm
Distribution:
96.3 %
Remarks on result:
other: %m/m retained on individual sieve
No.:
#2
Size:
630 µm
Distribution:
2 %
No.:
#3
Size:
315 µm
Distribution:
1.1 %
No.:
#4
Size:
250 µm
Distribution:
0.2 %
No.:
#5
Size:
200 µm
Distribution:
0.1 %
No.:
#6
Size:
125 µm
Distribution:
0.1 %
No.:
#7
Size:
100 µm
Distribution:
0 %
No.:
#8
Size:
75 µm
Distribution:
0.1 %
No.:
#9
Size:
63 µm
Distribution:
0 %

In individual measurements, a 100% cumulative retained was found respectively on mesh of 315, 250, 125, 75 and 75 µm.

From the average distribution above, 99.9% of particles are above 100 µm, and no particles are smaller than 63 µm.

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

Particle size distribution of the test substance was determined by sieving on a column with 9 mesh sizes from 1000 to 63 µm.

Five replicates were conducted, and the average distribution was reported.

With regard to inhalation potential, 99.9% of particles are larger than 100 μm, and no particles are smaller than 63 µm, therefore can't reach the thoracic fraction.

Fine particles relevant to dust explosion hazard (<630 μm) are less than 2%.

Description of key information

The substance contains no inhable particle (99.9% larger than 100 µm).

Low potential for dust explosion (<2% smaller than 630 µm).

Additional information

An experimental study is available. Despite restrictions as not related to a guideline, it is considered reliable and sufficient for purpose, and therefore a key study.