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EC number: 407-420-7 | CAS number: -
Particle size distribution (Granulometry)
Administrative data
Link to relevant study record(s)
Description of key information
The median particle size L50 of the test items deduced from the particle size distributions was 150.8 µm.
The particle size L10 of the test items deduced from the particle size distributions was 56.35 µm.
The particle size L90 of the test items deduced from the particle size distributions was 245 µm.
Additional information
The synthesis of the dye leads to a wet press cake, which is usually further processed with different agents to be either spray-dried to a distinctive particle size or dried, milled and mixed with dedusting agents, which encase the milled dye particles and thus lead to a distinctively larger particle size.
This particle size was measured by means of the dedusted formulation of a commercial formulation similar to the one of the test item as it will be imported and marketed, at its production site by laser diffraction (light scattering).
The distribution between these particle sizes are the following:
<23 μm <31 μm <46 μm <75 μm <101 μm <201 μm <281 μm <501 μm
1.74% 3.23% 6.99% 16.1% 26.0% 75.1% 98.2% 100%
>30 μm >45 μm >74 μm >100 μm >200 μm >280 μm >500 μm >800 μm
97.0% 93.3% 84.3% 74.4% 25.3% 2.00% 0% 0%
The median particle size L50 of the test items deduced from the particle size distributions was 150.8 µm.
The particle size L10 of the test items deduced from the particle size distributions was 56.35 µm.
The particle size L90 of the test items deduced from the particle size distributions was 245 µm.
As the particle size distribution is part of the formulation process and is standardised to deliver distinct particle sizes to enable the dye-houses standardised dyeing procedures, it is scientifically not justified to measure each of these product batches for particle size distribution.
The particle size of the batch used for physico-chemical and (eco)toxicological studies was
determined to assess the ability of the test substance to become airborne.
An assessment of the distribution of particle size in the test sample can be made by passing air at differing flow rates, through the sample and measuring the weight loss at each flow rate. From the results it was seen that a only minor proportion of the test substance was capable of becoming readily airborne (17.31 % <115 AED). Only a small proportion had an AED of <15 µm (0.55%).
The median diameter of the test substance is > 115 µm.
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