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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:
2016-09-01 to 2016-10-25
Reliability:
1 (reliable without restriction)
Rationale for reliability incl. deficiencies:
test procedure in accordance with national standard methods
Qualifier:
according to guideline
Guideline:
other: CIPAC MT 170
Deviations:
no
Principles of method if other than guideline:
In preliminary tests, the test item tended to form lumps and a particle size determination using Laser diffraction instrument according to CIPAC MT 187 would not deliver representative results. Thus the CIPAC MT 170 was used.
GLP compliance:
yes (incl. QA statement)
Type of method:
sieving
Type of particle tested:
primary particle
Type of distribution:
mass based distribution
No.:
#1
Size:
>= 50 µm
Distribution:
0.02 %
No.:
#2
Size:
>= 75 µm
Distribution:
0.05 %
No.:
#3
Size:
>= 100 µm
Distribution:
0.05 %
No.:
#4
Size:
>= 125 µm
Distribution:
0.08 %
No.:
#5
Size:
>= 150 µm
Distribution:
1.28 %
No.:
#6
Size:
>= 250 µm
Distribution:
17.18 %
No.:
#7
Size:
>= 500 µm
Distribution:
41.48 %
No.:
#8
Size:
>= 1 000 µm
Distribution:
37.2 %
No.:
#9
Size:
>= 2 000 µm
Distribution:
1.89 %

The particle size distribution was specified by two sieves in the range of 250µm (Rx >= 90%) and 2000µm (Rx <= 10%).

The retained material on the 75µm sieve was 0.03g (0.05%), the retained material on the 50µm sieve was 0.01g (0.02%) and the retained material on the pan was 0.01g (0.02%). 99.93% of the material was found to have particle size >= 100µm.

sieve
x µm
test 1 test 2 mean
mass gx
[g]
mass gx
[g]
mass gx
[g]
residue rx
[%]
sum Rx
[%]
pan 0.01 0.01 0.01 0.02 100.02
50 0.01 0.01 0.01 0.02 100.00
75 0.04 0.01 0.03 0.05 99.98
100 0.05 0.01 0.03 0.05 99.93
125 0.10 0.00 0.05 0.08 99.88
150 1.07 0.57 0.82 1.28 99.80
250 10.16 11.77 10.97 17.18 98.52
500 27.36 25.61 26.49 41.48 81.34
1000 23.51 24.00 23.76 37.20 39.86
2000 1.12 1.29 1.21 1.89 2.66
3350 0.47 0.49 0.48 0.75 0.77
5000 0.02 0.00 0.01 0.02 0.02
Conclusions:
The particle size distribution was specified by two sieves in the range of 250µm (Rx >= 90%) and 2000µm (Rx <= 10%).
The retained material on the 100µm sieve was 0.3 g (0.05%), the retained material on the 75µm sieve was 0.03g (0.05%), the retained material on the 50µm sieve was 0.01g (0.02%) and the retained material on the pan was 0.01g (0.02%).
99.93% of the material was found to have particle size >= 100µm.
According to the ECHA guidance IR/CSA R.7c, p. 170 -171 dust is categorized in inhalable dust MMAD 50 -100 µm, dust having the potential to reach the thoracic region MMAD 50 -15 µm, and dust with MMAD <15 µm has the potential to reach alveolar region.
Based on the result of the particle size for the test item 0.12 % of the particles are categorized as inhalable dust (50 -100 µm) and 0.02% < 50 µm.

Description of key information

In the preliminary tests using a laser diffraction instruments, the test results were disregarded given the test material tended to form lumps.

99.93% of the material was found to have particle size >= 100µm. The retained material on the 100µm sieve was 0.3 g (0.05%, the retained material on the 75µm sieve was 0.03g (0.05%), the retained material on the 50µm sieve was 0.01g (0.02%) and the retained material on the pan was 0.01g (0.02%) by dry sieve analysis according to CIPC MT 170 method.

Additional information

According to the ECHA guidance IR/CSA R.7c, p. 170 -171 dust is categorized in inhalable dust MMAD 50 -100 µm, dust having the potential to reach the thoracic region MMAD 50 -15 µm, and dust with MMAD <15 µm having the potential to reach alveolar region.

Based on the results of the particle size for the test item (using dry sieve analysis) 99.93% of the material was found to have particle size >= 100µm, 0.12 % of the particles are categorized as inhalable dust (50 -100 µm) and 0.02% have a particle size below 50 µm, thus a dustiness category of solid 'medium' is assigned in Chesar in accordance with to the ECETOC TRA No. 93, appendix C in a worst case scenario.