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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:
21 March 1990 to 06 September 1990
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
comparable to guideline study with acceptable restrictions
Qualifier:
no guideline followed
Principles of method if other than guideline:
This test was performed by the sieving method. The measurements were performed on an "Alpine Luftstrahlsieb" using mesh sizes in accordance with DIN 4188. 0.5 to 20 g of the test substance is analysed with sieves of successively coarser mesh sizes. Sieving with each mesh size is repeated until less than 1 % change in weight of the residual substance is observed within 180 seconds sieving time.
GLP compliance:
yes (incl. QA statement)
Type of method:
sieving
Type of distribution:
other: sieving method
Specific details on test material used for the study:
Product designation: Monoazo Yellow BG 3247
Identification: FAT 40400/A BG 3247/TV 6
Storage: Room temperature, 20 - 24 °C
Mass median aerodynamic diameter:
ca. 333 µm
Percentile:
D50
Mean:
333 µm
Remarks on result:
other: No source field for Standard deviation.
No.:
#1
Size:
2 000 µm
Distribution:
4 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#2
Size:
1 000 µm
Distribution:
6 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#3
Size:
800 µm
Distribution:
17 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#4
Size:
400 µm
Distribution:
43 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#5
Size:
200 µm
Distribution:
64 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#6
Size:
100 µm
Distribution:
87 %
Remarks on result:
other: Distribution in mass percent oversize.
No.:
#7
Size:
40 µm
Distribution:
98 %
Remarks on result:
other: Distribution in mass percent oversize.

Particle shape (qualitatively): platelets/parallelepipeds


The test substance contains a few large particles. Depending on whether some lumps come into the sieving sample or not, the results of subsequent siftings scatter considerably. For this reason, the average of all siftings is taken as the final result. The substance adsorbs water (ca. 10 %) under normal laboratory conditions. Therefore, the substance was exposed to the laboratory atmosphere for 2 hours prior to the sieving analysis. Largest particle sizes in analysis 4x6x10 mm/ 6x8x11 mm/ 8 x 9 x 12 mm.

Conclusions:
The mass median (aerodynamic) diameter of FAT 40400/A is 333 µm.
Executive summary:

In a GLP-compliant study, the mass median diameter of the test substance was determined in triplicate. The test was performed on an Alpine Luftstrahlsieb using the sieving method. Based on the study results, the mass median (aerodynamic) diameter of the test substance was determined to be 333 µm.

Description of key information

In a GLP-compliant study, the mass median diameter of the test substance was determined in triplicate. The test was performed on an Alpine Luftstrahlsieb using the sieving method. Based on the study results, the mass median (aerodynamic) diameter of the test substance was determined to be 333 µm.

Additional information