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EC number: 204-427-5
CAS number: 120-80-9
camera pictures & Microscope pictures
to brown flakes of catechol presented a great heterogeneity of sizes and
shapes with most large flakes ranging from 0.5 to 3 cm. A lot of
breakage parts of flakes were present. The finest particles around
bigger flakes looked like boken larger objects.
Analysis on the passing fraction at 2,7mm
results for the five samples are presented below:
22.6% of the particles weight presented sizes > 5000 µm.
A great quantity of flakes (67.8% weight) presented sizes in the range
from 1000 and 5000 µm.
the particles weight presented sizes < 1000 µm.
1.05% of the particles weight presented sizes <100 µm (see here after
laser diffraction analysis Sympatec).
Laser diffraction particle size
analysis performed on fine fraction (< 100 µm)
on the fine fraction (< 100 µm) coming from the sieving analysis gave
the following results:
<100µm = 40.0%w/w
< 1,8 µm : 0,5% in volume
< 10 µm : 0,9% in volume
Results obtained in fragility test with
attrition are described below:
The majority of the flakes (92.2% weight) were kept in their original
size (>1000 µm).
4.6% of the particles weight were found in the range from 500 to 1000 µm.
the particles weight were found in the range from 200 to 500 µm.
0.74 % of the particles weight were foud in the range from 100 to 200
No particles were found in the range < 100 µm.
This implies that
catechol flakes are not fragile; keeping their original size after
attrition. Furthermore, attrition does not generate fines particles with
size < 100 µm.
A standardised internal method specifically
developped for the case of flakes was developped. It was applied to
catechol flakes. Firstly, a sieving analysis was performed on flakes.
The fine fraction (particles size < 100 µm) hence obtained was
characterized using laser diffraction particle size analysis. A
fragility test using attrition was also carried out to compared the
granulometric results with and without attrition to assess the fragility
of catechol flakes.
The first sieving analysis (without
attrition) revealed that the majority of the flakes (90.3% weight)
presented sizes superior to 1000 µm. A very small quantity (1.05%) were
found in the size range below 100 µm. A laser diffraction analysis of
this fine fraction gave D10, D50 and D90 equal to 60.5 µm, 113.1 µm and
197 µm, respectively. The fragility test showed that flakes subjected to
attrition mainly kept their original size, and did not generate fine
particles with size inferior to 100 µm.
The majority of the catechol flakes (90.3% weight) presented sizes superior to 1000 µm. A very small quantity (1.05%) were found in the size range below 100 µm. A laser diffraction analysis of this fine fraction gave D10, D50 and D90 equal to 60.5 µm, 113.1 µm and 197 µm, respectively. The fragility test showed that flakes subjected to attrition mainly kept their original size, and did not generate fine particles with size inferior to 100 µm.
An experimental study is available. It was
performed according to a standardized internal method specifically
developed for the case of flakes. As this procedure is highly adapted to
catechol, this data was scored reliability 1 according to Klimisch and
was selected as a key study.
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