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Diss Factsheets

Physical & Chemical properties

Particle size distribution (Granulometry)

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Description of key information

Volumetric distribution (laser diffraction) was used for the determination of the particle size distribution of the registered substance and analogues Alcamizer P93 (EC no. 423-570-6) and Alcamizer 5 (EC no. 422-150-1). The obtained results are summarised below.
* Magnesium aluminium hydroxide carbonate (EC 234-319-3):
- in water: 97.6% is ≤ 1 µm and 0% is ≥ 5 µm; 10% is < 0.21 µm, 50% is < 0.41 µm and 90% is < 0.80 µm. 
- in air:  0% is < 1 µm and 2.28% is < 10 µm; 10%  is < 24.6 µm, 50% is < 58.4 µm and 90% is < 185.8 µm. 
* Alcamizer P93 (EC 423-570-6, Aluminium magnesium zinc carbonate hydroxide):
96% is < 2 µm and 100% is < 5 µm.
MMD: 0.8 µm 
* Alcamizer 5 (EC 422-150-1, Aluminium magnesium carbonate hydroxide perchlorate hydrate):
99.2% is ≤ 10 µm; 10% is < 0.61 µm, 50% is < 2.17 µm and 90% is < 5.46 µm.
MMAD: 3.2 µm (calculated using density data, MMAD = (2.16)^0.5 x 2.174)

Additional information

Based on the PSD results none of the substances should be regarded as a nanomaterial, yet such assessment should also take other parameters and information into account, such as specific surface area and SEM evaluations. Please refer to section 1.4 for more information.