[carbonato(2-)]hexadecahydroxybis(aluminium)hexamagnesium

Particle size distribution (Granulometry)

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.