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Aluminium tris(dihydrogen phosphate) (EC 236-875-2, CAS 13530-50-2) is inorganic solid white powder. The substance has a melting point > 450°C and therefore a study for boiling point does not need to be conducted. The relative density of aluminium tris(dihydrogen phosphate) was determined to be 2.34 at 21 °C. The water solubility of the test material has been determined to be 294 g/l at 20 °C in un-buffered glass double-distilled water (final pH solution 2). However, the solubility of the test material was demonstrated to be extremely sensitive to the initial nominal loading concentration of the solution and the media pH. The test substance reacts strongly acidic with water (the pH-value decreases with increasing loadings) and the solubility of the test item at a neutral pH-value was not determined. Therefore, a further solubility test of the test item in media simulating environmental conditions (OECD 29) was performed. Under these conditions and an loading of 100 mg/L test item, aluminium tris(dihydrogen phosphate) shows a solubility of 6.293 µg Al/L at pH 8 and a solubility of 5535.5 μg Al/L at pH 6 after 24 h (1 d).

The granulometry data shows that > 15% of the particles of aluminium tris(dihydrogen phosphate) are < 100 µm in diameter and therefore, the substance is considered to pose an inhalation risk.

Overall, it can be concluded that aluminium tris(dihydrogen phosphate) (EC 236-875-2, CAS 13530-50-2) is not considered to possess any of the following hazardous physical-chemical properties: autoflammability and/or self-ignition, flammability, explosiveness and oxidising properties.

Thus, the substance does not meet the classification criteria for physical-chemical hazard in accordance with Regulation (EC) No 1272/2008 (CLP) and the Globally Harmonized System of Classification and Labelling of Chemicals (GHS).